Conocybe siliginea (Fr.) Kühner, Encyclop. Mycol.

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

2. Conocybe siliginea (Fr.) Kühner, Encyclop. Mycol. 7: 96 (1935)

( Figure 1 , d–h)

Closed pileus initially globose, finally conical with the stipe elongated, yellowish to ochraceous. Expanded pileus convex, hemispherical to conical-campanulate, 9–14 mm in diameter, white, pale cream, becoming more tapered and ochraceous with age, with a central papilla slightly darker, best observable in young basidiomata, with surface smooth to pruinose, not hygrophanous, and edge slightly wavy to crenulated, non striated. Lamellae adnate, thick, waxy, initially pale cream, finally rust red to coppery with the maturation of basidia and basidiospores. Lamellulae present, similar to the lamellae in morphology. Stipe central, cylindrical, slightly bulbous at the base, hollow, finely pilose, white to pale cream, 25–46 mm long, 1–1.5 mm in diameter, 2.5–3 mm at the base. Ring absent. Volva absent. Cheilocystidia slightly incrusted, 22.5–25 × 15–25 μm, lecythiform, capitate, capitula 3–4 μm in diameter, hyaline, thin-walled. Pleurocystidia absent. Caulocystidia lageniform to irregular in shape, 10–25.5 × 7.5–10, with tappering to 2–2.5 μm broad near the apex. Clamp connections present. Basidia 2-spored, clavate, 20–32.5 × 7.5–12.5 μm. Basidiospores oblong to ellipsoid, smooth, dark yellow to golden, 13.5–18 × 8.5–9.5 μm, thick-walled, with a central or slightly eccentric large germ pore, 1.8–2 μm.

Material examined: — BRAZIL. Pernambuco, Universidade Federal Rural de Pernambuco ( UFRPE), Recife, on goat dung, 27 Oct 2011, R.F. R. Melo ( URM 86792!).

Distribution: —Europe ( Austria, England, Germany, Iceland, Italy, Luxemburg, Sweden), Oceania ( New Zealand). This is the first record from Brazil.

Notes: — Conocybe siliginea is recorded directly from incubated goat dung collected in Recife and forms pale colored basidiomata, usually with the stipe concolorous with the pileus. Conocybe rickenii (Jul. Schäff.) Kühner (1935) is similar to C. siliginea , differing by having slightly larger basidiospores as well as larger and darker pilea, usually with a distinct coloration from the stipe.

Figures

FIGURE 1. Bolbitius demangei a. Habit of a basidioma on dung. b. Basidiomata. c. Basidiospores. Conocybe siliginea d. Habit of basidiomata on dung. e. Basidiomata. f. Capitate cystidia. g. Basidia. h. Basidiospores. Scale bars: a=20 mm. b=2.5 mm. c, f, h= 5 μm. d= 200 μm. e=2 mm. g=7.5 μm. Figure: R.F.R. Melo.