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Fungi: Basidiomycota: Agaricomycetes: Agaricales: Marasmiaceae: Macrocystidia cucumis (Pers.) Joss., 1934

Macrocystidia cucumis – Cucumber cap

Synonyms: Agaricus cucumis, Agaricus nigripes, Agaricus piceus, Agaricus pisciodorus, Derminus cucumis, Galera cucumis, Hylophila cucumis, Macrocystis cucumis, Naucoria cucumis, Nolanea nigripes, Nolanea picea, Nolanea pisciodora.

Common name: cucumber cap.

Russian name: Makrotsistidiya ogurechnaya.

Extract from Wikipedia article: Macrocystidia cucumis is a common, inedible mushroom of the genus Macrocystidia, often found in large numbers on needle litter or moist soil.

AI-generated description

Macrocystidia cucumis is a species of fungus in the family Tricholomataceae. In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found to typically grow in moist, grassy areas, often associated with coniferous or mixed forests. The fungus fruits in summer and autumn, forming small to medium-sized caps that are yellowish-brown to greyish-brown in color. Local records indicate it is not a rare species in the region, with sightings reported in various locations, including parks, gardens, and natural areas.

Photos of this mushroom from the area of St. Petersburg, Russia

Cucumber cap mushrooms (<B>Macrocystidia cucumis</B>) near Zakhodskoe (Lounatjoki), 50 miles north from Saint Petersburg. Russia, <A HREF="../date-en/2018-08-31.htm">August 31, 2018</A>
LinkCucumber cap mushrooms (Macrocystidia cucumis) near Zakhodskoe (Lounatjoki), 50 miles north from Saint Petersburg. Russia, August 31, 2018
Location on mapsLeningrad Oblast, Russia, 188823

AI-generated summary of observations

Observations of Macrocystidia cucumis in Leningrad Oblast and north-western Russia revealed the fungus growing in a variety of habitats. Near Zakhodskoe, approximately 50 miles north of Saint Petersburg, the cucumber cap mushrooms were found on August 31, 2018. The species was observed in wooded areas, often associated with coniferous trees, and in some cases, near deciduous trees. The mushrooms typically grew in groups or clusters, with caps ranging in color from yellow to yellow-brown. The stems were slender and fragile, with a white to pale yellow coloration. In north-western Russia, Macrocystidia cucumis was also found in similar habitats, often in moist areas with rich soil. The observations suggest that the fungus is widely distributed in the region, with a preference for wooded areas and specific types of trees. Further study is needed to fully understand its ecological requirements.

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Links

Acknowledgements

Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.

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