Laxitextum lutescens Hjortstam & Ryvarden, Mycotaxon

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 : 6-9

4. Laxitextum lutescens Hjortstam & Ryvarden, Mycotaxon 13: 40 (1981). Figure 5 .

Basidiomata resupinate to pileate, 0.4–0.6 mm thick, pileus deep yellow to pale brown, velutinate, azonate; hymenial surface cream-yellow to straw-coloured with a notably pale purplish brown tint; trama well developed, pale yellowish brown.

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

Gloeocystidia present, 90–120(–200) × 6–9 μm, in the young state fusiform, subulate, often with a moniliform apical appendix, occasionally up to 200 μm long, distinctly amyloid.

Basidia narrowly clavate, 20–25 × 4–5 μm, tetrasterigmate.

Basidiospores 4 × 3–3.3 μm, subglobose to broadly ellipsoid, thin-walled, finely echinulate, amyloid.

Substratum. On decayed hardwood.

Distribution. Cameroon, Ghana.

The species is similar to Laxitextum bicolor but differs in its deep yellow upper surface, amyloid gloeocystidia, and smaller basidiospores.

Figures

Figure 5. Microscopic features of Laxitextum lutescens. A, Section through the basidioma; B, section of the hymenium; C, basidiole and basidium; D, clamped subicular hyphae; E, basidiospores. Drawn from the holotype, Ryvarden 12875 (O), by L. Ryvarden.