Laxitextum incrustans 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 : 4-6

3. Laxitextum incrustans Hjortstam & Ryvarden, Mycotaxon 13: 35 (1981). Figure 4 .

Basidiomata resupinate, widely effused, often loosening from substratum along the margin; hymenial surface smooth, cream to ochraceous, more or less cracked in dry condition.

Hyphal system monomitic; hyphae with clamps, loosely interwoven, golden yellow, encrusted, 3–6 μm wide with thickened walls; oleiferous hyphae scattered to common, slightly amyloid.

Gloeocystidia present, in the young state fusiform, subulate, often with a moniliform apical appendix, more or less projecting, in old specimens cylindrical, mostly obtuse, 70–80 × 4–6 μm.

Basidia narrowly clavate, 15–25 × 4–5 μm, tetrasterigmate.

Basidiospores 4–5 × 3–3.3 μm, subglobose to ellipsoid, echinulate, strongly amyloid.

Substratum. On decayed hardwoods.

Distribution. Brazil, Cameroon, Ethiopia, Kenya, Tanzania, USA.

The resupinate basidioma shape and encrusted hyphae characterise this species.

Figures

Figure 4. Microscopic features of Laxitextum incrustans. A, Section of the hymenium; B, basidioles and basidium; C, gloeocystidium; D, encrusted, clamped tramal hyphae; E, basidiospores. Drawn from the holotype, Ryvarden 10108 (O), by L. Ryvarden.