On the type of Coprinus aureogranulatus
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Original description
Coprinus aureogranulatus Uljé & Aptroot in Persoonia 16: 549. 1998.

Pileus up to 20 x 15 mm when still closed, 50 mm wide when expanded, first (sub)globose, woolly felty and golden-yellow (Mu. 10 YR 8/8) or yellow-brown to orange-brown, then ellipsoid or ovoid to campanulate and becoming smooth, sulcate striate and paler around centre (Mu. 10 YR 8/6), at margin cream (Mu. 10 YR 8/3). Lamellae, L= c. 26, l= 1-3, free, first white, then yellow-brown to dark brown, finally black; margin dentate. Stipe up to 100 x 2-3 mm, silky white; base slightly bulbous, up to 4 mm wide and densely covered with golden-yellow mycelium.
Spores [60,3,1] 6.2-7.8 x 4.1-5.1 x 3.7-4.3 µm, subcylindrical ellipsoid in frontal view, phaseoliform in side-view, medium to rather dark red-brown with rounded, convex or flattened base and truncate apex, with central, c. 1.4 µm wide germ pore; apiculus very small and difficult to see; Q= 1.40-1.70, av. Q= 1.50-1.55; av. L= 6.8-7.0 µm, av. B= 4.5-4.7 µm, av. W= c. 4.0 µm. Basidia 16-30 x 5.5-8 µm, 4-spored, surrounded by 3-5 pseudoparaphyses. Pleurocystidia absent or very rare and similar to cheilocystidia. Cheilocystidia 40-90 x 13-23 µm, lageniform with 8-16 µm wide, cylindri-cal neck, in tufts on lamellae edge; in young basidiocarps intermixed with (sub)globose cells (probably from veil). Pileipellis covered with a thick layer of globose cells intermixed with hyphoid elements and pileocystidia 60-90(-110) x 12-20 µm with cylindrical, 6-15 µm wide neck. Veil consisting of sphaerocysts, abundant, up to 30 µm in diam., thick-walled, with walls up to 1.2 µm thick, yellow-coloured and slightly incrusted, often as end cells in chains of elongate elements. Caulocystidia 60-125 x 14-22 x 10-16 µm, lageniform, in small tufts scattered on stipe. Clamp-connections absent.
Habitat & distribution. Subfasciculate on dead branches, sometimes seemingly on soil. Only known from Papua New Guinea (north-east).

Collections examined. Papua New Guinea: Madang Province, near Gogol river bridge, 17 km. S of Madang along road to Lae (5° 20' S, 145° 42' E. alt. 10 m.), on branch in open forest on raised coral reef, 15 August 1992, Aptroot no. 33271H (CBS). Type-material cultivated in the Netherlands: prov. Utrecht, Baarn, 16 July 1996 (holotype: Uljé 1295, L), living culture, CBS 753.96; Madang Province, S side of Ramu valley, 11 km W of Brahman Mission. Logging site in lowland forest remnant (5° 44.9' S, 145° 19,7 E. alt. 100 m.) 30 October 1995, Aptroot no. A404 (CBS). Isolated from soil in tropical forest, living culture CBS 973.95.

Coprinus aureogranulatus belongs to subsection Setulosi because of the presence of setulae on stipe and pileus. On account of the structure of the veil and the shape of the pileocystidia, Coprinus aureogranulatus seems rather similar to Coprinus disseminatus (Pers.: Fr.) S.F. Gray (descr. Uljé & Bas 1991: 290), but that species has darker brown sphaerocysts, longer setulae, and spores that are slightly smaller and of different shape. The spores of Coprinus disseminatus are ovoid with conical base (submitriform) in frontal view and ellipsoid in side-view, whereas in Coprinus aureogranulatus the spores are ellipsoid or ovoid with rounded to convex or even almost flattened base in frontal view and slightly phaseoliform in side-view. In addition, cheilocystidia are abundant in Coprinus aureogranulatus, but lacking in Coprinus disseminatus. In this species only the pileocystidia continue along the edge of the lamellae over a short distance near the margin of the pileus. Another neighbouring species is Coprinus pyrrhantes Romagn. (Romagnesi 1951: 128; Uljé & Bas 1991: 288), which can have the same golden-brown colour, but the pileocystidia in that species have a much smaller, tapering neck, spores that are never phaseoliform and subglobose cheilocystidia.

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