Heteroplacidium fusculum  

Thallus crustose, areolate to squamulose-areolate, areoles to ca 2 mm diam and to ca 600 µm thick, angular to rounded, mid to chocolate brown, flat or slightly convex, dull or somewhat shiny, constricted at the base to form short peg-like projections composed of vertically oriented hyphae, composed of pseudoparenchymatous tissue throughout the upper and lower cortex and algal layer, and a mixture of cylindrical and pseudoparenchymatous tissue in the medulla. Rhizines absent.
Anamorph: conidiomata pycnidial, immersed in the thallus, composed of several irregular and contorted linked cavities within pseudoparanchymatous tissue. Conidiophores absent, conidiophores lining the cavities, doliiform, proliferating percurrently. Conidia 3-5 µm long, cylindrical with rounded ends, hyaline, aseptate.
Teleomorph: Ascomata perithecia, ± globose, immersed within the areoles with only the ostiolar regions emergent, the peridium initially pale but darkening with age especially around the ostiole. Hymenium lacking algal cells. Asci clavate. Ascospores 9-14 x 7-9.5 µm, widely ellipsoidal to subglobose, thick-walled (to ca 1 µm), hyaline, aseptate.