On the type of Coprinus calosporus
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Original description
Coprinus calosporus Bas & Uljé in Persoonia 15 (1993) 359.

Pileus up to 29 x 12 mm when still closed, up to c. 30 mm when expanded, first ellipsoid, cylindric-ellipsoid, often somewhat conical, white in very young stage, soon becoming greyish or grey-brown, the darkest at centre of pileus, expanding to conical, then to convex or applanate, finally plano-concave with revolute margin. Surface of pileus beneath veil first dark brown (Mu. 10 YR 4/3), later somewhat paler (10 YR 5/4). Veil in primordia smooth, mat, pure white, later grey to grey-brown (10 YR 7/3), covering entire pileus, soon radially splitting into hairy to fibrillose, often pointed and appressed or - especial-ly at centre - recurved flocks. Lamellae, L = 32-46, l = 1-3(-5), free, narrow, rather crowded, first white, soon greyish brown to blackish. Stipe 50-100 x 2-4 mm, whitish, somewhat tapering towards apex, up to 5 mm wide at clavate to slightly bulbous base, hollow, hairy flocculose but particularly dense at lower part, becoming glabrous with age; base clavate with short and narrow pseudorhiza.
Spores [60,3,3] 7.3-9.8 x 4.6-5.8 x 4.1-4.8 mm (without ornamentation); Q = 1.35-1.75, av. Q = 1.60; av. L = 8.0-8.4, av. B = 5.0-5.4, av. W = c. 4.4 mm, amygdaliform, towards base often slightly conical and lemon-shaped at apex, covered with many short, but broad and rounded nodules, with conical base and truncate apex, red-brown, and central, c. 1.3 mm wide germ pore. Basidia 13-24 x 6-8 mm, 4-spored, surrounded by (3-)4-5(-6) pseudoparaphyses. Pleurocystidia 30-150(-145) x 20-40 mm, ellipsoid to oblong or slightly broadly lageniform. Cheilocystidia 30-70(-90) x 20-35 mm, ellip-soid to oblong, sometimes slightly broadly utriform. Pileipellis a cutis, made up of cylindrical or fusiform, more or less parallel, repent hyphae, up to 150 mm long and 4-25 mm wide. Veil made up of inflate, sausage-like elements, 30-150(-250) x (3-)5-25(-40) mm, often somewhat inflated, usually constricted at septa. Clamp-connections present.
Habitat & distribution - Growing fasciculate on stem of Yucca (indoors). Only known from the type-locality.

Collections examined. NETHERLANDS, prov. Zuid-Holland, Leiden, Rijks-herbarium, 18 Apr. 1991, C. Bas 8795 (holotype), C.B. Uljé 1131 (isotype); 30 April 1991, C. Bas 8795b. The amygdaloid spores with rounded nodules make it very easy to recognize Coprinus calosporus. No other Coprinus has such spores. The fact that the species is found indoors, in a flowerpot, makes it probable that it is a species from warmer regions than the Netherlands.
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