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Tricholoma vernaticum
''Tricholoma vernaticum'' is an agaric fungus of the genus ''Tricholoma'' native to the Pacific Northwest region of the United States. The fungus was originally described in 1976 as a species of ''Armillaria'' when that genus was more inclusive; it received its current name twenty years later. The stout fruit bodies (mushrooms) have moist white to grayish caps (later becoming grayish-brown with age), a membranous ring on the stipe, and an odor resembling cucumbers. Mycorrhizal with conifers, the fungus fruits in the spring or early summer, with its mushrooms appearing on the ground singly or in groups at high elevations, often at the edge of melting snowbanks. The edibility of the mushroom is unknown, but it has a strong unpleasant odor and a mealy taste.
==Taxonomy==
The species was originally described from California as ''Armillaria olida'' by mycologists Harry D. Thiers and Walter Sundberg in 1976. The type specimen was collected on May 6, 1972, in the Crystal Basin Recreation Area in El Dorado County. Thiers and Sundberg classified it in the section ''Ponderosa'' of genus ''Armillaria'' due to its inamyloid spores, but noted that its relationship to other species was unclear. They also noted the similarity of the form and color of its cap to species in section ''Constricta'' of genus ''Lyophyllum''.〔
Thiers and Sundberg used a broad species concept of ''Armillaria'', including species with a white spore print, gills attached to the stipe, and a ring formed from a partial veil, regardless of their ecological preferences. Today, ''Armillaria'' is restricted to wood-rotting species that form black rhizomorphs, and several mycorrhizal former ''Armillaria'' have since been transferred to ''Tricholoma''. The name ''Tricholoma olida'' was unavailable for this species, because it was previously used in 1920 by Josef Velenovský,〔 so Kris Shanks proposed the new name ''T. vernaticum''. The specific epithet refers to its growth in the spring.〔 The previous epithet ''olida'' derives from the Latin ''olidum'', meaning "stinking" or "smelling".〔
''Tricholoma vernaticum'' is classified in the subgenus ''Contextocutis'' of the genus ''Tricholoma'' on account of its clamp connections and interwoven hyphae in the cap cuticle.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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