On the type of Coprinus brunneistragulatus Van De Bogart
Back to Index type studies
Original description
Coprinus brunneistragulatus Van De Bogart in Mycotaxon 8: 246. 1979 (The genus Coprinus in Western North America, part 2: sect. Lanatuli). Holotype: North America: state Washington, Insula, 6 Oct. 1968, F. Van De Bogart 194 (WTU).

Pileus at first ovate, then conical, then campanulate, and finally revolute. Prior to expansion 2.0-2.5 cm in length, after expansion 4.0-6.0 cm in breadth. At first dark grey with lighter colored universal veil patches and dark greyish brown at the apex, with maturity becoming darker grey and brownish black at the apex. Some plicate striations developing under the universal veil, the striations often masked at least in part by the veil. Surface completely covered at first, and partly covered at maturity by a feltlike universal veil that breaks up into irregular patches as the pileus expands. Flesh thin and membranous even at the apex. Stipe hollow, thin, slender, tapered from base to apex, 10-12 cm x 2-5 mm. Base nearly abrupt. White or faintly greyish, opaque. Surface somewhat fibrillose. Flesh thin, fragile and easily broken. Lamellae narrowly lanceolate, some lamellulae present, 0.5-2.8 cm x 3-4 mm, free or slightly adnexed when young, crowded at first, then less so as pileus expands and plicate striation develops. Pale then blackish brown. Autodigestion incomplete, most of the lamellae lysing but usually most of the pileal surface remaining. Odor and taste not observed. Spores subglobose to broadly limoniform, round in cross-section, 6.9-8.8 x 6.2-7.5 µm, apiculus tiny but often visible, germ pore apical, 1.0-1.4 µm in diameter. Color en masse brownish black, microscopically deep purple-brown in 3% KOH. Contents guttulate or not. Wall with a prominent pale brown perisporium that shows best on spores of young specimens but is also found on those of older specimens. Cheilocystidia globose 12.5-38.0 µm in diameter, or ellipsoidal with rounded ends, 44.0-50.0 x 17.0-22.0 µm, hyaline, thin walled, smooth. Pleurocytidia long ellipsoidal, ends usually rounded, 110.0-142.0 x 45.0-52.0 µm, hyaline, smooth, thin walled, numerous, often bridging between two opposing lamellae. No other cystidia present. Pileal surface of radially oriented hyphae. Universal veil of large patches adhering to the pileus, composed of chains of smooth, thin walled, hyaline, cylindrical to greatly swollen hyphae, 40.0-150.0 x 11.2-44.0 µm, constricted at the septae in most cases. The chains of cells seem to be adherent to each other but are seldom anastomosed. Clamp-connections present on stipe and universal veil.
Habitat. Terrestrial on moist, shaded lawns, solitary.

This species resembles Coprinus lagopides Karst. in most ways but differs markedly in the presence of a pigmented perisporium.

Observations
Spores [20,1,1] 6.7-8.4 x 6.0-7.0 µm, ovoid or ellipsoid, tending to quadrangular, with rounded base and rather truncate apex, and central, c. 1 µm wide germ pore, very dark red-brown; Q = 1.10-1.20, av. Q = 1.15; av. L = 7.8, av. B = 6.6 µm. Basidia, pseudoparaphyses and cystidia collapsed. Veil made up of hyphoid, thin-walled elements, 20-100 x 15-36 µm, usually somewhat inflated and constricted at septa; terminal cells cylindrical with obtuse apex or ellipsoid. Clamp-connections not found.

Notes: Very bad material. Only a stipe, a part of stipe with collapsed pileus as a black mass at apex and a small part of a pileus.
Up
Up