Greying brittlegill mushroom (Russula decolorans) together with Russula covered by fungus Hypomyces viridis in Dibuny, north-west from Saint Petersburg, Russia, August 9, 2016
Unnamed Road, g. Sankt-Peterburg, Russia, 197758Synonyms: Byssonectria viridis, Hypolyssus viridis, Hypomyces luteovirens, Peckiella viridis, Sphaeria viridis.
Common name: green gillgobbler.
Russian names: Gipomitses zelenyy, Pekiella zhiolto-zeleneiushchaya.
Hypomyces viridis is a species of ascomycete fungus that infects russula and lactarius mushrooms. In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found to commonly parasitize Russula spp., particularly R. vesca and R. paludosa, causing a green to yellow-green discoloration of the host mushroom's cap and stem. The fungus produces perithecia that are immersed in the host tissue, with ascospores measuring 35-45 μm in length. It typically fruits from July to September in coniferous and mixed forests.
Greying brittlegill mushroom (Russula decolorans) together with Russula covered by fungus Hypomyces viridis in Dibuny, north-west from Saint Petersburg, Russia, August 9, 2016Unnamed Road, g. Sankt-Peterburg, Russia, 197758The observation of Hypomyces viridis in Leningrad Oblast and north-western Russia revealed its presence on specific species of mushrooms. Notably, the greying brittlegill mushroom (Russula decolorans) was found to be infected by Hypomyces viridis in Dibuny, located northwest of Saint Petersburg, Russia, on August 9, 2016. Additionally, other species of Russula were also observed to be covered by this fungus. The infection typically results in a greenish coloration due to the mycelium of Hypomyces viridis enveloping the mushroom caps. This observation highlights the parasitic relationship between Hypomyces viridis and certain species of mushrooms in the region, contributing to the understanding of fungal interactions in north-western Russia's ecosystems. The specific date and location provide valuable data for further studies on the distribution and behavior of this fungus.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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