The thallus of
Asterothyrium vezdae is (growing on the upper leaf surface), forming rounded to irregular patches that are 1–2 mm in diameter, with a thickness of 20–30
μm. The entire thallus can measure 3–5 mm across and has a smooth, white surface comprising colourless, rectangular cells. Its is . The
apothecia are typically single on each thallus patch, and in form but with a outer margin. They are rounded and measure 0.3–0.6 mm in diameter and 100–180 μm in height. The is plane, with a yellow-brown to dark brown colour, while the margin is thick, strongly prominent, and divided into irregular lobes. The is , and the is colourless to pale brown. The
hymenium is colorless, while the is yellow-brown.
Asci have an
ellipsoid to
ovoid shape, while are oblong to , and have from 7 to 15 septa with slight constrictions at the septa.
A. vezdae the first species in genus
Asterothyrium known to have up to 15-septate spores. are and conical, with a triangular base, while are oblong-ellipsoid and lack septa.
Asterothyrium octomerum, found in tropical Africa, has spores similar to
A. vezdae, but these spores only contain 7 septa that do not have constrictions. Additionally,
A. octomerum has brownish-grey, rather than black apothecia. ==Habitat and distribution==