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Fungi: Ascomycota: Leotiomycetes: Helotiales: Helotiaceae: Helotium dearnessii (Ellis & Everh.) W. L. White, 1942

Helotium dearnessii

Synonyms: Hymenoscyphus dearnessii, Phialea dearnessii.

Russian name: Gimenostsifus Dernessa.

AI-generated description

Helotium dearnessii is a species of fungus in the family Helotiaceae. In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found to grow on decaying wood, particularly coniferous trees, in moist and shaded areas. The fungus produces small, cup-shaped apothecia with white or cream-colored hymenium and a short, hairy stem. It typically fruits in late summer to early fall. Local collections often feature specimens with a diameter of 0.5-2 cm, and the species is considered relatively rare in the region.

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

Small cup fungi <B>Helotium dearnessii</B> (Hymenoscyphus dearnessii)(?) (Ascomycota) on a dry stalk of giant knotweed (Reynoutria sachalinensis) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, <A HREF="../date-en/2017-09-12.htm">September 12, 2017</A>
LinkSmall cup fungi Helotium dearnessii (Hymenoscyphus dearnessii)(?) (Ascomycota) on a dry stalk of giant knotweed (Reynoutria sachalinensis) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017
Location on mapsulitsa Professora Popova, 1/6, St Petersburg, Russia, 197022
Small stalked cup-shaped fungus <B>Helotium dearnessii</B> (Hymenoscyphus dearnessii) or may be H. fucatus (Ascomycota) on a dry stalk of giant knotweed (Reynoutria sachalinensis) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, <A HREF="../date-en/2017-09-12.htm">September 12, 2017</A>
LinkSmall stalked cup-shaped fungus Helotium dearnessii (Hymenoscyphus dearnessii) or may be H. fucatus (Ascomycota) on a dry stalk of giant knotweed (Reynoutria sachalinensis) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017
Location on mapsulitsa Professora Popova, 1/6, St Petersburg, Russia, 197022

AI-generated summary of observations

Observations of Helotium dearnessii in Leningrad Oblast and north-western Russia reveal its presence on dry stalks of giant knotweed (Reynoutria sachalinensis). In the Botanic Gardens of Komarov Botanical Institute, Saint Petersburg, the fungus was found on September 12, 2017. It appeared as small cup fungi or small stalked cup-shaped fungus, with possible identification as Hymenoscyphus dearnessii or potentially H. fucatus. The fungus was specifically noted on dry stalks of giant knotweed, suggesting a preference for this substrate. The observations highlight the occurrence of Helotium dearnessii in controlled environments like botanical gardens, indicating its ability to thrive in such settings. Further identification is needed to confirm the species, with H. fucatus being a possible alternative due to similarities in appearance.

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Acknowledgements

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

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