Chaenothecopsis caespitosa

Apothecia in effuse masses of compact tufts, 1.2–4 mm tall, black; heads 0.18–0.38 mm diam., hemispherical to lens-shaped, dark grey to black, sometimes pruinose; the stalk very robust, 0.12–0.25 mm diam. near the base, sometimes branched, cylindrical to distinctly tapering, similarly coloured to the head. Hamathecium of paraphyses, 1–1.5 µm diam. Asci 65–85 × 5–6 µm, narrowly cylindrical, the apex thickened and with an internal canal to ca 3 µm in length, 8-spored. Ascospores arranged uniseriately, pale brown, (7.5–) 9–12 (–14) × 3–4.5 µm, cylindric-ellipsoidal to ± cylindrical, mostly 1-septate but with occasional aseptate spores within the same asci as 1-septate spores, not constricted at the septa, thick-walled, smooth to slightly rough,
without a perispore.

Not associated with algae. Easily distinguished by its large robust apothecia that arise in tufts, and unlikely to be congeneric with the type of Chaenothecopsis. The presence of paraphyses is not typical of the genus, but has been reported for other resinicolous species (e.g. Tuovila et al. 2014).