Lachnum subvirgineum

A lignicolous species infecting broadleaf wood, with white cup-shaped apothecia 1-1.5 mm in diameter, and short marginal hairs with widened apices.

Marginal hairs cylindrical, septate, 55-85 µm long and 3-4 µm wide, covered across their entire surface with fine granulations, with a widened, slightly capitate apex up to 6 µm wide.

Medullary excipulum of textura intricata, with hyaline, septate, thin-walled hyphae 3-6 µm wide.

Ectal excipulum with subglobose to prismatic, rectangular hyphae arranged in parallel chains, up to 20 µm wide.

Asci cylindric-clavate, 8-spored, with uniseriate to apically biseriate spore arrangement, 45-60 µm long and 3.5-5 µm wide, with basal croziers and an amyloid apical apparatus in Melzer's reagent.

Paraphyses lanceolate, 3-4.5 µm wide, exceeding the level of the asci by 4-12 µm.

Ascospores cylindric-fusiform, smooth, hyaline, thin-walled, with homogeneous internal content without guttules or granulations.

Very similar to its congener, Lachnum virgineum, the latter possessing longer marginal hairs without apical swellings.

Herbarium material available: JTP1947/23.