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Spores 4-5 × 2.5-3.5 µm, Iron salts negative; KOH and ammonia dark red; yellow coloration in 3% KOH mount

Species Lists


Resupinate crust fungus
Iron salts negative
Ammonia and KOH positive – dark red
Encrusted cystidia
Small spores, 5 × 3 µm

Proposed Names

85% (1)
Based on microscopic features: Spore size, cystidia
Based on chemical features: Bleeds yellow in 3% KOH mount

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= Observer’s choice
= Current consensus


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