Septobasidiales » Septobasidiaceae » Auriculoscypha

Auriculoscypha anacardiicola

Auriculoscypha anacardiicola D.A. Reid & Manim. 1985, in Reid, & Manimohan, Transactions of the British Mycological Society, 85(3), 532-535 (1985)

Diagnosis: Fruit bodies dependent, cupulate with central, dorsally attached stipe, and of a woody nongelatinous texture. Disc ~15 rom diam, at first white then creamy with grey tint from centre out, becoming either slate-grey, or grey with ochraceous tint, or cinnamon-brown with grey tint, smooth, pruinose, often deeply umbilicate. Outer surface radially wrinkled, especially toward the margin and densely zonate or somewhat sulcate, minutely feIty tomentose but often glabrescent towards the stipe; varying from whitish at the margin through ochre to dark brown or black. Stipe 5-12 mm long, 2-4 mm wide, terete, horny, more or less smooth to knobbly, minutely tomentose and cinnamonbrown, becoming very dark brown to black, and either minutely pruinose or glabrous, arising from a small tubercle which originates beneath the bark. Flesh approaching 1 mm in thickness, golden-brown and cottony-fibrous throughout with no distinct cuticular layer; in no part gelatinous. Hyphae of context 4.4-6.6µm wide, almost hyaline near the margin but otherwise pale brown to brown, with thickened glassy refractive walls, but retaining a distinct septate lumen with septa often rather close together, but lacking clamp-connexions, and with very little branching. Surface tomentum formed of brown, pale brown or subhyaline hyphae, 4' 5-6·6 j.lm wide, which are either (1) elongated and only accidentally branched, with obtusely rounded apex, and appearing rather glassy, virtually solid and with only a very narrow secondarily septate lumen towards the tip; these undifferentiated surface hairs are unaffected by 10% KOH, or (2) hyphae or hairs of extraordinary appearance resembling conidiophores with apical branching resulting in a cluster of short branches, usually each with a pointed apex. In 10% KOH these hyphae, up to 6.6 µm wide, are very thick-walled and become more or less hyaline toward the tip, where the wall disintegrates, leaving the central strand intact. The latter can then be seen to have its own wall which thickens toward the apex, and the branching can be seen to take place from this central strand (Fig. 1). In aniline-blue in lactic acid the dissolution in the outermost layers of the wall does not occur, and these conidiophore-like hyphae merely appear thick-walled. In some fruitbodies there is a mixture of both types of hyphae clothing the surface. Scanty, hyaline, thin-walled, suballantoid conidia, 8.5-12.5 x 3.0-3.5 µm, were observed amongst the conidiophore-like hyphae, but they are unlikely to belong to the fungus concerned and are probably of extraneous origin. Hymenium a catahymenium of (1) narrow, unbranched septate hyphidia, 2-3 µm wide, with thickened wall but retaining a distinct lumen, the wall thinning out toward the apex, (2) scattered basidia. Basidia 70-90 x 10-15 µm, thin-walled or with slightly thickened wall in basal region, hyaline, varying from clavate to circinate, r-z-septate, but with only two fertile segments; swollen probasidium lacking. Spores 22-43 x 9-10 (-12) µm, thin-walled, hyaline, cylindric to allantoid, with up to 7 (or more) transverse septa, occasionally with both transverse and longitudinal septa and then appearing rnuriform; germination not seen.

Index Fungorum Number: IF104026

Figure 1. Auriculoscypha anacardiicola. (A) Hymenium showing one mature and one immature basidium together with hyphidia. (B) Five basidia in various stages of maturation. (C) Spores, some septate, one muriform. (D) Conidiophore-like hairs clothing outer surface offruit body; one on left mounted in aniline-blue in lactic acid, two on right mounted in 10% KOH, showing dissolution of wall. (E) Undifferentiated surface hairs. (F) Conidia, trapped in surface hairs. All x 666.


Figure 2. Auriculoscypha anacardiicola. Fruit bodies.



Reid, D. A., & Manimohan, P. (1985). Auriculoscypha, a new genus of Auriculariales (Basidiomycetes) from India. Transactions of the British Mycological Society, 85(3), 532-535.


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