noun
livid pinkgill; Entoloma sinuatum
A poisonous mushroom species. The name is primarily used in mycology and mushroom foraging contexts.
イッポンシメジは毒キノコなので、絶対に食べてはいけません。
The livid pinkgill is a poisonous mushroom, so you must never eat it.
この森では秋になるとイッポンシメジが見られることがあります。
In this forest, you can sometimes see livid pinkgills in autumn.
The name likely derives from 一本 (ippon, 'one stem') and 占地 (shimeji, a type of mushroom), but the exact origin is uncertain.