Parasol Mushroom (Macrolepiota procera): A Comprehensive Reference
Identity, Taxonomy, and Morphology
Scientific Classification and Nomenclature
Macrolepiota procera (Scop.) Singer is a fungus commonly called the parasol mushroom, belonging to the family Agaricaceae (order Agaricales, division Basidiomycota, kingdom Fungi). The fungus was first described in 1772 by Italian naturalist Giovanni Antonio Scopoli, who named it Agaricus procerus. Rolf Singer transferred it to the genus Macrolepiota in 1948. Synonyms of Macrolepiota procera var. procera include Agaricus procerus Scop. and Lepiota procera (Scop.) Gray. The specific epithet procera means "tall," an adjective wholly appropriate to these stately mushrooms.
Macrolepiota procera is the type species of the genus Macrolepiota, and two varieties of this species are formally recognised. The variety pseudo-olivascens Bellù & Lanzoni was defined in 1987 and is generally found under conifers; it differs visibly in developing olive stains on the cap surface.
Physical Description
This species has a whitish-brown, erect, and high (10–40 cm) stem, hollow in the center, with a large movable ring on it. The cap is large (10–30 cm in diameter), umbrella-shaped in adult specimens, and takes a light (whitish) color with characteristic brown small patches. Under the cap, there is a lamellar hymenophore in the form of densely arranged gills. The cap can reach 25 centimetres wide. At full maturity, the cap is more or less flat, with a smooth, dark umbo in the centre.
The stipe is inedible due to being very fibrous in texture, unless dried and ground into a powder.
Natural Habitat and Distribution
Macrolepiota procera, the parasol mushroom, is a basidiomycete fungus with a large, prominent fruiting body resembling a parasol. M. procera, commonly called the parasol mushroom, is a natural saprophytic, growing alone or in small, scattered groups in woods or at the edges of woods. It is widespread in temperate regions of Eurasia and possibly North America. Further research is needed to confirm whether specimens found in North America are the same species.
M. procera, also known as the parasol mushroom, is a wild edible mushroom widespread in temperate and subtropical regions such as Thailand, India, and Europe. In the United Kingdom, it can be found from July through to November.
Common Names and Forms of Use
In German-speaking countries, Macrolepiota procera is commonly referred to as "Riesenschirmling" (giant umbrella). Also known as the Snake's Hat mushroom and the Snake's Sponge, parasol mushrooms grow individually or in fairy rings in temperate regions in pastures, trail edges, grassy seaside cliffs, lawns, and in open forests.
The species is choice as an edible mushroom. It is sought after and popular in Europe, due in part to its large size, seasonal frequency, and versatility in the kitchen. In central and eastern European countries this mushroom is usually prepared similarly to a cutlet — run through egg and breadcrumbs and then fried in a pan with some oil or butter. Parasol mushrooms are considered gourmet mushrooms in Europe, prized for their large size and seasonality, and are highly sought after in the wild as they cannot be cultivated on a large scale.
Traditional and Historical Use
European Folk and Culinary Traditions
Mushrooms have been used extensively, owing to their nutritional and medicinal value, for thousands of years. The history of Macrolepiota procera is long intertwined with rural European traditions. In Slavic countries like Poland and the Czech Republic, generations of foragers have passed down the knowledge of identifying M. procera, and it is often one of the first mushrooms introduced to children learning the art of wild mushroom collection. In German-speaking countries, its presence in cultural mushroom walks and fairs is rooted in post-war subsistence nutrition cultures. People relied on this hearty, protein-rich mushroom during times of economic difficulty. In Mediterranean cultures, the mushroom featured prominently in autumnal feasting and was linked to harvest celebrations.
The mushroom's alimentary use has been documented by local people living in the Jirisan and Lombard Stelvio National Parks in South Korea and Italy, respectively, and in the Balkans. M. procera is one of the most favourite wild edible mushrooms for consumers in Central Europe, including Slovakia.
Traditional Medicinal Applications
Macrolepiota procera is an edible mushroom used in the treatment of diabetes, hypertension, and inflammation in traditional contexts. Mushrooms have been recognized as a folk remedy due to their vast range of nutraceutical compounds, as well as medicinal and preventive properties. They are considered as a functional food, as well as assisting in the prevention of fatal infections.
Macrolepiota procera is a fungus that is often included in the menu of people looking for replacements for meat products, at the same time appreciating mushrooms. Historically, the mushroom's thick, meaty cap made it a valued protein source, particularly in meat-scarce periods or among vegetarian traditions across Central and Eastern Europe.
Key Constituents and Active Compounds
Macronutrient Composition
M. procera is low in calories and fat yet rich in dietary fiber, carbohydrates, high-quality proteins, minerals, and vitamins. The total protein (Kjeldahl method) content in dried fruiting bodies of M. procera was 20.2%, and polysaccharide (PS) content was 18.6%. M. procera boasts high protein content, a complete array of essential amino acids, digestive-aid dietary fiber, vitamins B2, B3, and B5, minerals such as potassium, phosphorus, magnesium, and iron, as well as bioactive compounds like polyphenols and flavonoids, all contributing to its high nutritional value.
Polysaccharides and Beta-Glucans
The total carbohydrate content of the water-extractable polysaccharide complex (MP-PSC) was 74.2%, with glycogen occupying 36.7%, followed by β-D-glucan, α-L-fuco-2-(1,6)-D-galactan, and β-D-glucomannan. M. procera has been recognized as a good source of soluble and insoluble dietary fibers. Its consumption can provide an essential amount of the recommended daily dietary allowance of fibers. It has been estimated that the β-glucan content in MP is between 7.9 and 11.2%.
Chemical analysis of the polysaccharide-rich fraction Mp-CPS revealed it is mainly composed of glucose- and galactose-based heteropolysaccharides, with β-glucans as the predominant glucan type.
Phenolic Compounds and Other Bioactives
M. procera is a source of proteins, polyunsaturated fatty acids, tocopherols, indoles, minerals (including selenium), fiber, carotenoids, phenolics, triterpenoids, alkaloids, and other compounds.
LC-MS analysis of individual phenolic compounds revealed that protocatechuic acid (92.52 ± 0.45 and 125.50 ± 0.89 µg/g dry weight) was the predominant compound detected in M. procera samples from Morocco and Portugal, respectively. GC-MS analysis showed that the most abundant biomolecule group was sugar compositions (59.00% and 53.71%), with glycerol (24.43%) as the main component in the Portuguese sample.
Macrolepiota procera can produce a wide variety of secondary metabolites, including organic acids, alkaloids, terpenoids, steroids, and phenolic compounds. Furthermore, they contain a diverse array of bioactive compounds, including polyphenols, flavonoids, and triterpenoids, which have demonstrated antioxidant, anti-inflammatory, and antitumor properties, and are being explored for the development of novel functional foods and nutraceuticals.
Minerals and Trace Elements
M. procera is a rich source of high value-added bioactive components, minerals (particularly K, Mg, and Se), and dietary fiber. Some elements (Cu, Zn, Rb, Se, Pb, Hg, Cd, Mo) occur at greater concentrations in the caps than the stalks of M. procera, and some (Ag, Ba, Sr, V, Tl) dominate in the stalks, while for others the proportion varies depending on the sampling site.
Unique Proteins and Enzymes
A new β-trefoil lectin, isolated from the parasol mushroom, has been associated with its in vitro antiparasitic activity. Cysteine protease inhibitors, named macrocypins, suppressing the growth of Colorado potato beetle larvae, have also been found in the parasol mushroom. Edible mushrooms are a source of specific ribonucleases with potent insecticidal, antimicrobial, and antitumor properties, and of bioactive peptides with antibiotic, antithrombotic, and antihypertensive effects.
Scientific Evidence by Health Area
1. Antioxidant Activity
The biological potential of the polysaccharide fraction Mp-CPS was evaluated in light of its antioxidant activity. Antioxidant assays (TEAC, ORAC) demonstrated significant radical-scavenging capacity, with higher activity observed in the ORAC test.
Antioxidant activity was evaluated by free radical scavenging and reducing power. M. procera extract had more potent free radical scavenging activity (IC50 = 311.40 μg/mL) than Lactarius deliciosus extract.
Methanolic extracts of M. procera showed a strong antioxidant capacity: using DPPH free radical-scavenging activity (IC50 1.06–1.32 mg/mL); inhibition of β-carotene bleaching radicals (IC50 0.09–0.53 mg/mL); and reducing power radicals (IC50 0.52–1.11 mg/mL).
One polysaccharide fraction (PS-II) exhibited in vitro antioxidant activity against hydroxyl radicals (EC50 = 875 μg/mL), superoxide radicals (EC50 = 80 μg/mL), and oxidation of β-carotene (EC50 = 345 μg/mL). The reported antioxidant activities of PS-II and MP-PSC (ORAC activity of 313.3 ± 23.9 μmol TE/g) revealed that these polysaccharide fractions should not be considered potent antioxidant agents.
Evidence strength: All antioxidant data for M. procera come from in vitro laboratory assays. No human or clinical trials on antioxidant endpoints have been identified. The evidence is preliminary and confined to experimental models.
2. Immunomodulatory Effects
A 2022 study investigated the structural features of a polysaccharide complex from M. procera (MP-PSC), its immunomodulatory activities and effects on probiotic and pathogenic bacteria. MP-PSC was obtained by boiling water, and polysaccharides were characterized by 2D NMR spectroscopy. The immunomodulatory effects on blood-derived neutrophils, other leukocytes, and murine macrophages were studied by flow cytometry, chemiluminescence, spectrophotometry, and ELISA.
MP-PSC at 200 μg/mL increased the number of CD14+ monocyte cells in the blood, after ex vivo incubation for 24 hours. Furthermore, water-extractable polysaccharides from M. procera have been reported to stimulate immune responses in vitro, displaying notable immunomodulatory activity.
Kim et al. demonstrated that the antitumor effect of a water-soluble polysaccharide–protein conjugate, isolated from a submerged culture of Lepiota procera, is expressed by its immunopotentiation activity, but not via a direct cytotoxic effect against sarcoma 180 tumors in ICR mice.
Evidence strength: Immunomodulatory evidence consists of in vitro cell-based assays and one rodent model. No human clinical trials have been conducted. Evidence is preliminary.
3. Anticancer and Cytotoxic Activity
Anticancer properties of M. procera have been reported, though most available data concern organic solvent extracts. M. procera fruiting body extracts exhibited cytotoxic activity against human lung adenocarcinoma A549 cells.
Zara et al. found that an 80% ethanolic extract of M. procera exhibits anticancer activity against A549 lung adenocarcinoma cells with an IC50 = 6.18 μg/mL, after 24 hours of treatment. The antitumor effect of this mushroom extract was explained by its inhibitory activity on glucose-6-phosphate dehydrogenase enzyme, which is important for cancer progression.
Seçme et al. determined that a M. procera extract suppresses the expression of cyclin genes regulating cell progression, and Bcl-2 inhibiting apoptosis, while it activates genes involved in triggering apoptosis, such as caspase-3, -9, Bax, and the genome protective tumor suppressor gene p53.
Results from one study indicated that Macrolepiota procera was much more effective against cancer in the A549 and LS174 cell lines, while HeLa cells were more vulnerable to Lactarius deliciosus.
Silver nanoparticles synthesized using M. procera extract demonstrated cytotoxicity against multiple human cancer cell lines, including MCF-7 (breast), A549 (lung), Saos-2 (bone), and HT-29 (colon).
The ethanolic extract of Macrolepiota procera and aqueous extract of Pleurotus ostreatus showed significant cytotoxic effects against the COLO-205 cell line.
The polysaccharide fraction Mp-CPS also inhibited key pro-inflammatory enzymes COX-1, COX-2, and LOX. In vitro research (MTT and LDH assays) has shown the chemopreventive abilities of Mp-CPS against human colon cancer cells, which intensified with the degree of cell malignancy.
Despite the indicated anticancer effects of some extracts, studies strictly dedicated to polysaccharides — which are the main class of compounds responsible for such activities — remain limited. Therefore, current study focused on evaluating the chemopreventive properties of M. procera polysaccharides is novel and contributes valuable preliminary insights.
Evidence strength: All anticancer data are from in vitro cell-line studies and one rodent tumor model. No human clinical trials exist. The evidence is preclinical and exploratory only. In vitro cytotoxicity does not establish efficacy or safety in humans.
4. Anti-inflammatory Activity
The anti-inflammatory activity of M. procera has partly been attributed to some lanostane-type triterpenoids and cinnamic acid, isolated from the mushroom, inhibiting in vitro NO production in phagocytes.
The polysaccharide fraction Mp-CPS inhibited key pro-inflammatory enzymes: COX-1, COX-2, and LOX in laboratory assays. Beyond in vitro assays, mycelial polysaccharides from M. procera have been shown to protect mice against nonylphenol-induced reproductive toxicity by alleviating oxidative stress, cell damage, and inflammation.
Evidence strength: Anti-inflammatory data are limited to in vitro enzyme inhibition assays and a single rodent study. No human trial data exist. Evidence is weak and preliminary.
5. Antimicrobial Activity
Studies were designed for the determination of antioxidant, antimicrobial, and anticancer potential of edible mushrooms including Macrolepiota procera. The antimicrobial potential was determined with a microdilution method on 15 microorganisms.
Antioxidant activity was detected using the DPPH free radical scavenging method. M. procera extract had more potent free radical scavenging activity than A. mellea extract (IC50: 0.191, 1.19 mg/mL).
Beyond its nutritional value, M. procera contains diverse bioactive compounds contributing to antibacterial, antioxidant, anti-inflammatory, and immunomodulatory effects.
Evidence strength: Antimicrobial data are exclusively from in vitro (laboratory) testing using microdilution or disk/well diffusion methods. No human clinical evidence exists. Findings are exploratory.
6. Prebiotic and Gut Health Potential
Considering the biological activity of polysaccharides, it has been demonstrated that they exhibit marked antioxidant properties and prebiotic potential. M. procera has been recognized as a good source of soluble and insoluble dietary fibers. Its consumption can provide an essential amount of the recommended daily dietary allowance of fibers.
Evidence strength: Prebiotic potential has been demonstrated in laboratory assays only. No clinical trials in human populations have confirmed a prebiotic effect.
7. Cardiovascular and Metabolic Effects
Reported health-promoting properties of these mushrooms include antioxidant, immunomodulatory, anticancer, antimicrobial, anti-inflammatory, hypoglycemic, hepatoprotective, and cardiovascular benefits. These attributions are discussed in the context of their constituent compounds, particularly polysaccharides and phenolics; direct human evidence is lacking.
M. procera boasts high protein content, a complete array of essential amino acids, digestive-aid dietary fiber, vitamins B2, B3, and B5, minerals such as potassium, phosphorus, magnesium, and iron, as well as bioactive compounds like polyphenols and flavonoids, all contributing to its high nutritional value. These constituents suggest potential immunomodulatory, antitumor, antioxidant, and lipid-lowering properties. These are suggested associations based on constituent profiling, not human clinical evidence.
Evidence strength: No clinical trials specifically assessing cardiovascular or metabolic endpoints have been reported for M. procera. Claims in this area are speculative, based on constituent identity alone.
Overall State of Human Clinical Evidence
While in vitro and some in vivo studies have demonstrated promising bioactivities, there is a critical need for well-designed clinical trials to validate these findings in humans. This will provide robust scientific evidence for the efficacy of Macrolepiota-derived compounds in preventing and treating various diseases.
Investigating the potential synergistic effects of different bioactive compounds within these mushrooms could lead to the development of more potent and effective formulations for therapeutic applications. This includes exploring combinations of polysaccharides, phenolic compounds, and other bioactive components to maximize their combined health benefits.
In summary, as of the most recent literature reviewed (through 2025), there are no published randomized controlled trials, controlled clinical trials, or other prospective human intervention studies specifically evaluating Macrolepiota procera extracts or preparations for any therapeutic endpoint. All evidence for bioactive effects remains at the preclinical stage (in vitro cell lines, animal models, or constituent analysis).
Dosage Forms and Reported Preparations
No standardized dosage recommendations exist in any pharmacopeia, regulatory monograph, or clinical guideline for Macrolepiota procera as a supplement or medicinal preparation, reflecting the absence of completed human clinical trials.
In the scientific literature, the following forms and concentrations have been used exclusively in experimental (laboratory or animal) settings:
- An 80% ethanolic extract of M. procera was used in cell-culture experiments, showing anticancer activity against A549 cells with an IC50 = 6.18 μg/mL after 24 hours of treatment.
- A water-extractable polysaccharide complex (MP-PSC) was obtained by boiling water extraction. Immunomodulatory effects on blood-derived neutrophils and murine macrophages were assessed by flow cytometry, chemiluminescence, spectrophotometry, and ELISA.
- MP-PSC at 200 μg/mL was used in ex vivo blood incubation studies lasting 24 hours to assess effects on CD14+ monocyte populations.
- A polysaccharide-rich fraction (Mp-CPS) was isolated from fruiting bodies using ultrasound-assisted extraction for in vitro biological testing.
- The stipe is inedible due to its fibrous texture unless dried and ground into a powder, a preparation used in culinary contexts.
The influence of various forms of processing and conservation of raw mushroom on its health-promoting properties has been discussed in the scientific literature. Cooking methods such as boiling, frying, and drying have been studied with respect to their impact on bioactive compound retention, but no clinical dose-response data in humans have been reported.
Safety Considerations
Toxicity of the Species Itself
Macrolepiota procera is broadly recognized as safe when properly identified and adequately cooked. Consuming the mushroom raw may cause stomach discomfort in sensitive individuals, which is why thorough cooking of Macrolepiota procera is always indicated.
Heavy Metal and Toxic Element Accumulation
M. procera is a rich source of high value-added bioactive components, minerals, and dietary fiber. However, this saprobic mushroom has the ability to digest cellulose and lignin and is an accumulator of toxic elements.
The fruit bodies of edible M. procera, not only those close to roads but also at a greater distance, may contain significant amounts of toxic As and Cd, which could pose a health risk if consumed.
The health risk assessment for M. procera caps showed a cause for concern related to Cr, Cd, As, and Hg due to frequent consumption of around 300 g of fresh caps per day during the mushrooming season.
M. procera could serve as a good dietary source of essential elements, especially Cu, Zn, Mn, and Fe, but the consumption of mushrooms may pose a health risk for consumers during the "season of mushrooms," due to the presence of cadmium.
Cadmium and lead content in caps of M. procera was usually below the European Union tolerance limit value of 2.0 and 3.0 μg/g dw set for cultivated mushrooms, respectively. However, these two toxic metals have been found in elevated concentrations in M. procera from unpolluted stands outside of Poland as reported by some authors, implying the possibility of relatively high background levels in this species.
The effectiveness of accumulating mineral elements by wild-growing mushrooms depends mainly on species, their growth place, and the underlying soil's chemical characteristics.
Misidentification Risk: Toxic Lookalikes
One of the most significant documented safety risks associated with M. procera use is misidentification in the wild. Chlorophyllum molybdites is the most commonly consumed poisonous mushroom in North America, often being misidentified as edible species like Chlorophyllum rhacodes (the shaggy parasol) and Macrolepiota procera (parasol mushroom). The species is poisonous and causes potentially serious vomiting and diarrhea.
The most hazardous case involves confusing the parasol mushroom with highly poisonous species from the Chlorophyllum genus, particularly Chlorophyllum molybdites. While M. procera has a white spore print, C. molybdites releases greenish spores and can cause severe gastrointestinal symptoms.
Lepiota brunneoincarnata is much smaller than M. procera and is known to have caused fatal poisonings in Spain.
Edible species of Macrolepiota closely resemble the poisonous species of Chlorophyllum, which leads to frequent misidentification.
Key morphological features that distinguish authentic M. procera include:
- M. procera has a snakeskin-like pattern on its stalk and, critically, white spores instead of greenish ones. The gills of M. procera remain white or creamy with age.
- Chlorophyllum molybdites is the only large mushroom that has a green spore print.
- The stem of C. molybdites lacks the snakeskin pattern that is generally present on the parasol mushroom.
Several former members of the Macrolepiota genus are now sited in the genus Chlorophyllum, which contains a number of large parasol-like fungi now known to be toxic to many people — for example Chlorophyllum rhacodes, the Shaggy Parasol.
North American Identification Complexity
The picture is more complex in North America, where the species not only has multiple lookalikes (including some that also have "parasol" in their names), some of them toxic, but also a major identity problem. What is normally identified as North American M. procera may actually be a group of as-yet-unidentified species. Whether M. procera actually exists in North America among its lookalikes is unclear. At least most of the North American parasols appear to be edible.
Body Systems and Health Areas of Association
- Immune system: Water-extractable polysaccharides from M. procera have been reported to stimulate immune responses in vitro, displaying notable immunomodulatory activity.
- Gastrointestinal system: Polysaccharides from M. procera have been shown to exhibit prebiotic potential in laboratory studies, and high dietary fiber content supports digestive health.
- Oncology (preclinical only): Cytotoxic and chemopreventive activities have been observed in multiple cell lines (A549, COLO-205, HeLa, MCF-7, HT-29, LS174) in vitro.
- Cardiovascular/metabolic: Constituents suggest potential antioxidant and lipid-lowering properties, though no human evidence supports these in the context of M. procera specifically.
- Oxidative stress: Multiple in vitro assays confirm radical-scavenging capacity of both phenolic and polysaccharide fractions.
- Inflammation: Anti-inflammatory activity has been partly attributed to lanostane-type triterpenoids and cinnamic acid, inhibiting NO production in phagocytes in vitro.
Summary of Evidence Quality
Most of the scientific literature from 2015 to 2021 on the chemical composition of M. procera fruiting bodies concerns their antioxidant properties and health-promoting possibilities, taking into account their antibacterial, antioxidant, anti-inflammatory, regulatory, antidepressant, and anticancer effects. This body of research is almost entirely preclinical. Macrolepiota procera is not as extensively studied for its medicinal qualities as other functional mushrooms like Ganoderma lucidum (Reishi) or Lentinula edodes (Shiitake). The most robustly established facts about M. procera relate to its nutritional composition (protein, fiber, vitamins, and minerals), its heavy metal bioaccumulation characteristics, and its misidentification risks — rather than confirmed clinical therapeutic effects.
References
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