Phyllotopsis nidulans (Mock Oyster)
Europe, North America
Cap 2-10 cm diameter
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Phyllotopsis nidulans, commonly known as mock oyster or the orange oyster, has a fruit body that consists of a fan-shaped, light orange fuzzy cap that grows singly or in overlapping clusters. The cap underside is crowded with orange gills. Mock oyster mushrooms have a strong, unpleasant odour and grow on deadwood of hardwoods and conifers.

Cap roughly fan-shaped or semicircular, with a convex shape and a dry texture. It is prominently hairy, especially when young, occasionally displaying a whitish dusting initially but quickly transitioning to bright orange, which fades to yellowish orange or orangish-yellow over time. When young, the margin is rolled inward. The flesh is pale orange, soft and not changing when sliced. Gills close or nearly crowded, thin with frequent short-gills. They range in colour from bright to pale orange. Stem very short or nonexistent. Spore print very pale pink.

Microscopic Features: Spores measure 4.5–6 x 1.5–2.5 µm and are allantoid, smooth, and hyaline in KOH, with no amyloid reaction.

Phyllotopsis nidulans on the MushroomExpert.Com Web site.

The fifth photo is by myco20200701 and licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported license.

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