Coprinellus angulatus (Peck) Redhead, Vilgalys & Moncalvo

Melo, Roger Fagner Ribeiro, Chikowski, Renata Dos Santos, Miller, Andrew Nicholas & Maia, Leonor Costa, 2016, Coprophilous Agaricales (Agaricomycetes, Basidiomycota) from Brazil, Phytotaxa 266 (1), pp. 1-14 : 5

3. Coprinellus angulatus (Peck) Redhead, Vilgalys & Moncalvo , Taxon 50(1): 232 (2001)

( Figure 2 , a–e)

Closed pileus initially ellipsoid, 13–18 × 9–13 mm, ochraceous brown to gray-brown, becoming lighter towards the margin, naked, with several setose pileocystidia, hardly observable in stereomicroscopy. Expanded pileus campanulate, 25–27 mm in diameter, dark gray to whitish. Veil absent. Lamellae free, rarely adnexed, initially whitish, finally dark gray to black with the maturation of basidia and basidiospores. Stipe central, cylindrical, hollow, pubescent, straight or crooked, whitish, 25–50 mm long, 1.5–2 mm in diameter. Ring absent. Volva absent. Pileocystidia abundant, setose, 75–110 μm, lageniform, decreasing considerably in diameter towards the apex, about 10–15 μm in diameter at the proximal end, tapering to 1–2 μm near the distal end, hyaline, smooth, thin-walled. Cheilocystidia not observed. Pleurocystidia not observed. Basidia 4-spored, club-shaped, surrounded by hyphidial elements. Basidiospores mitriform in frontal view, cylindrical to ellipsoid in side view, flat, dark reddish brown, 7.2–8.5 × 6–7.5 μm, thick-walled, with a central germ pore.

Material examined: — BRAZIL. Pernambuco, Instituto Agronômico de Pernambuco ( IPA), Serra Talhada , on horse dung, 04. Jun 2012, R.F. R. Melo ( URM86793 !) ; Universidade Federal Rural de Pernambuco ( UFRPE), Recife , on cattle dung, 19. Jun 2012, R.F. R. Melo ( URM86794 a!, 86794b!) .

Distribution: —Europe ( Netherlands, Switzerland). This is the first record from Brazil.

Notes: — Coprinellus angulatus , a rare species on herbivore dung, has small basidiomata forming directly on incubated dung, with a thinner stipe than the specimens described from soil or plant material. It can be easily distinguished by the combination of the following characters: naked pileus, with setose pileocystida exceeding 100 mm in length and mitriform basidiospores in frontal view.

Figures

FIGURE 2. Coprinellus angulatus a. Habit of basidiomata on dung. b. Basidiomata. c. Lamellae and stipe insertion. d. Setae. e. Basidiospores. Coprinellus marculentus f. Habit of basidiomata on dung. g. Basidiomata. h. Lamellae and lamellulae. i. Setulae. j. Cheilocystidia. k. Basidiospores. Scale bars: a, f=200 mm. b, c, e= 2.5 μm. d, i=25 μm. g=5 mm. h=2.5 mm. j=15 μm. k=5 μm. Figure: R.F.R. Melo.