Chaenothecopsis tigillaris  

Thallus: absent, non-lichenised; saprophytic on the hymenophore surface of basidiomata.
Anamorph: not known.
Teleomorph: Ascomata black, stalked apothecia, somewhat glossy, non-pruinose, stalk mainly 150-200 μm tall. Stalk 35-50 μm wide below the capitulum, consisting of dense intertwined brownish and torulose hyphae, 2-2.5 μm wide, periclinally orientated forming a textura intricata, becoming paler towards the base. Capitulum hemispherical, expanding abruptly from the stalk, surface convex, ± smooth, not forming a mazaedium, 195-210 μm diam. Exciple lecideine, dark brown, 4-7.5 μm thick, 2 or 3 cells deep, composed of short-torulose hyphae with somewhat angular isodiametrical cells, ca 3.5-4.5 μm diam., non-continuous below the hypothecium. Hypothecium dark brown, poorly developed, formed by a continuation of the stalk hyphae expanding radially and periclinally, textura intricata, ca 50 μm high. Hymenium hyaline, 65-75 (-80) μm tall. Epithecium continuous, persistent, brown, 4.5-6.5 μm thick, formed of adhering almost pseudoparenchymatous cells, individually 3-4.5 μm diam., with somewhat unevenly thickened walls, formed from terminal branches of interascal filaments. Asci persistent, narrowly cylindrical, unitunicate, 45-52 x 2.5-3.5 (-3.5) μm, 8-spored. Ascospores uniseriately arranged in the ascus, ellipsoidal, with slightly pointed ends, olive-brown, 1-septate, with darker brown septum and spiral ornamentation in the outer cell wall, 4.5-7 x 2-3 μm.
Chemistry: No chemical changes have been detected in any part of the ascomata after the application of 10% KOH.

Image of lectotype: here.