White-laced Shank

Megacollybia platyphylla

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By Roger Phillips

Published 2006

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White-laced Shank Megacollybia platyphylla (Pers.) Kotl. & Pouzar syn. Tricholomopsis platyphylla (Pers.) Singer (illustrated 40% life size) Cap 4–10cm across, hemispherical, soon expanded with depressed centre; dark grey-brown with an ochraceous tint; somewhat streaky surface, sometimes disrupting into minute, scurfy scales towards the margin. Stem 30–50×10–13mm, passing into long, rooting mycelial strands; whitish, often flushed with the cap colour, fibrillosely striate; tough. Flesh white; taste bitter, smell not distinctive. Gills very broad; whitish-cream. Spores 6–8×6–7¼, subglobose. Spore print white. Cheilocystidia 50–60×15–25¼, swollen pear-shaped, thin-walled. Habitat attached to deciduous stumps or pieces of buried wood by the tough, white mycelial strands; summer to autumn. Common. Not edible. Note this species was previously included in the genus Tricholomopsis.