Agaricus porphyrocephalus: The Ultimate Mushroom Guide
About The Agaricus porphyrocephalus Mushroom
Agaricus porphyrocephalus is a rare mushroom and it is difficult to distinguish between a brownish Field Mushroom Agaricus campestris and the brownish Agaricus porphyrocephalus. Most authorities appear to accept that this is not merely a form of a variety of Agaricus campestris but a unique species; however, the macroscopic and microscopic differences are not great, and so it would be easy to confuse these grassland mushrooms.
Cap color is whitish and they are covered with fine purplish-brown radial fibrils. Gills pink at first, the free crowded gills turn brown as the fruitbody matures. Stem white and smooth above the narrow, ring-like remnants of the partial veil. Stems are cylindrical or slightly swollen centrally and then taper towards a narrower base. The flesh of this mushroom turns slightly pinkish when cut.
Agaricus porphyrocephalus Identification
Saprobic; growing alone, scattered, or gregariously in meadows, fields, lawns, and grassy areas; fall; midwestern and eastern North America.
4–9 cm; convex, becoming broadly convex; dry; whitish to brownish underneath brown to grayish brown fibrils and scales; the young margin often adorned with hanging whitish remnants of the partial veil.
Free from the stem; crowded; short-gills frequent; whitish in buttons but soon pink, then maturing to dark brown; covered with a thin white partial veil when in the button stage.
3–6 cm long; 1–1.5 cm thick; more or less equal above a slightly tapered base; with a quickly collapsing whitish ring; whitish to brownish; bald or finely fibrillose.
Whitish; not changing when sliced.
Spores: 5.5–6.5 x 3.5–4.5 µm; ellipsoid; smooth; thick-walled; brown in KOH. Basidia 4-sterigmate. Pleurocystidia not found. Cheilocystidia not found. Pileipellis a cutis; elements 5–10 µm wide, smooth, hyaline to yellowish in KOH.
The Prince Agaricus augustus is similar but much larger and has somewhat larger spores; its cut flesh smells like bitter almonds.
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