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''Agaricus perobscurus'', commonly known as the "princess", is a moderate-sized mushroom. A relative of ''Agaricus augustus'', which is known as the "prince", ''A. perobscurus'' can be differentiated in several aspects. While the "prince" is widely distributed in North America, the "princess" is found only in the San Francisco Bay Area. Besides its smaller size, it is distinguished from ''Agaricus augustus'' by a darker-brown cap, a patchy fibrillose stipe surface at youth, lacking densely floccose-scaly, and a different fruiting season.〔Arora, p. 338〕 Another commonly closely associated ''Agaricus'' species, ''Agaricus praeclaresquamosus'', is toxic. It can be differentiated by its dark-grey cap, a phenolic, rather than an anise odor, and a stipe base which yellows immediately when injured.〔Boa, p. 123〕〔Arora, p. 340〕 ==Description== The cap is broad, and becomes deeply convex to flattened. The surface is dry, with a uniformly dark-brown disc. The disc can be either flattened or depressed, and is appressed fibrillose-squamulose. Towards the margin, it begins to diffuse. It is brown over a pallid ground color. Meanwhile, the margin is incurved in youth, then decurved, and eventually turns straight or slightly raised. The cap cuticle bruises slowly tawny-brown, and yellows in KOH. The flesh is white, soft, and can be up to thick. When injured, it can change to a cream color to tawny. The odor is that of anise, with a mild taste.〔Boa, p. 147〕 The gills are free, close, and relatively broad. When young, they have a whitish color, though they turn blackish-brown at maturity. The gills can be either five or six-seried. The stipe can be long, and thick. Often tapered to a bulbous base, it can be stuffed to hollow at maturity. The surface of apex is white, and silky-striate. The lower portion is white, with the fibrils forming scattered appressed squamules. In contrast, the base of the stipe discolors slowly a dull orange-brown where handled. The flesh changes sporadically from a cream-yellow to tawny-brown when injured or cut. The partial veil is white, membranous, and has small brown floccose scales concentrated near the margin. The annulus is thin and pendulous on the stipe.〔Arora, p. 314〕 The spores are 6.5–8.0 μm by 4.5–5.0 μm, smooth, thick-walled, and ellipsoid. They are inequilateral in profile, without a conspicuous hilar appendage. Their germ pore is not evident, and the spore print is a blackish-brown color. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Agaricus perobscurus」の詳細全文を読む スポンサード リンク
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