Typhula idahoensis

Dark amber to dark chestnut sclerotia when not desiccated, dark brown to almost black when desiccated. Sclerotia not gelatinous. Clavulae of sporophores pale yellow to gray white, transition to gray brown on the stipes. Genetic factors governing sclerotial size vary widely across the world: Specifically in Japanese B, long snowcover selects for larger, and brief snowcover for smaller; while in Polish populations, incubation temp was significant and overwhelmed genetic factors, more often producing smaller sclerotia. Across the world, smaller sclerotia are an adaptation to shorter or highly variable duration of snow cover, and strongly for the combination of the two.

S. ishikariensis is found in cool temperate areas, frigid zone areas, and into the Arctic, including northern Japan, Russia, northern Scandinavia, and North America. Specifically including Arctic areas of Alaska, the Yukon, Greenland, Finnmark county in Norway (especially group III), Finnish Lapland, Swedish Lapland, Svalbard (especially group III), and Greenland (especially group III). Further south, Switzerland, southern Siberia, southern and central Norway (especially groups I and II), and the Mie Prefecture on Honshu in Japan. Any grassland getting more than 150 days of snow cover.

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