Laxitextum globisporum T.W.Henkel & Ryvarden, 2021

Henkel, Terry W. & Ryvarden, Leif, 2021, A SYNOPSIS OF THE WOOD-DECAY GENUS LAXITEXTUM (HERICIACEAE, RUSSULALES, BASIDIOMYCOTA) AND A NEW SPECIES FROM CAMEROON, Edinburgh Journal of Botany 78 (348), pp. 1-9 : 4

2. Laxitextum globisporum T.W.Henkel & Ryvarden , sp. nov.

Differs from all other Laxitextum species in its combination of ochraceous pileus and small, globose basidiospores. – Type: Cameroon, Region 3 East, Dja Biosphere Reserve , 3 km S of Somaloma village , 26 viii 2018, on stump of unknown hardwood tree, leg. T. Henkel 10753 (holotype YA; isotype HSC, O). Index Fungorum 556984.

Figures 2 , 3 .

Basidiomata flabelliform, semicircular, 20 × 30 mm, about 0.5 mm thick, flexible; pileus ochraceous, subzonate, smooth when fresh, when dry slightly radially wrinkled, bent, and curled; hymenial surface smooth, pale wood-coloured; hymenium in section dense, about 30 μm deep; subhymenium distinct, pale ochraceous, 50–80 μm thick; trama rather loose and cottony, c.400 μm thick.

Hyphal system monomitic; hyphae with clamps; tramal hyphae loosely interwoven, pale yellow, 3–5 μm wide; oleiferous hyphae abundant in subhymenium and trama, yellow, distinctly amyloid, 4–6 μm wide.

Gloeocystidia present, 60–120 × 4–8 μm, yellow, acuminate, distinctly amyloid.

Basidia 18–25 × 4–6 μm, narrowly clavate, tetrasterigmate.

Basidiospores globose, 3–3.5 μm in diameter, a few subglobose, thin-walled, finely echinulate, amyloid.

Substratum. On decayed tropical hardwood stump.

Distribution. Known only from the type locality in the Dja Biosphere Reserve, Cameroon.

The ochraceous pileus and the small, globose basidiospores make Laxitextum globisporum a distinct species in the genus.

Figures

Figure 2. Microscopic features of Laxitextum globisporum T.W.Henkel & Ryvarden, sp. nov. A, Basidia and gloeocystidia; B, mature gloeocystidium; C, basidiospores. Drawn from the holotype, Henkel 10753, by L. Ryvarden.

Figure 3. Laxitextum globisporum T.W.Henkel & Ryvarden, sp. nov. Photograph of the holotype, Henkel 10753. Scale bar, 10 mm. Photograph by T. W. Henkel.