Trichasterina G. Arnaud, Annals d’École National d’Agric. de Montpellier, Série 2 16(1–4): 172 (1918) [1917]

Synonyms
Doguetia Bat. & J.A. Lima, Publções Inst. Micol. Recife 227: 21 (1960)
Trichosia Bat. & R. Garnier, Publções Inst. Micol. Recife 295: 14 (1960)

Epiphytes on the upper surface, forming blackened, circular areas. Superficial hyphae spreading over the leaf surface, with appressoria and scattered with superficial thyriothecia and setae. Appressoria circular, lateral and alternative, sparsely septate. Sexual state: Thyriothecia solitary, gregarious, superficial, easily removed from the host surface, black, opening with star-like fissures when mature. Upper wall comprising a thin layer of mostly neatly arranged dark cells, which are branched at the outer rim, from which hyphae strands develop, base poorly developed. Hamathecium usually lacking pseudoparaphyses, with asci vertical inside. Asci 8- spored, bitunicate, fissitunicate dehiscence not observed, globose to subglobose, apical region of asci usually with a thick opaque region ocular chamber not observed, not staining blue in IKI. Ascospores overlapping, conglobate, 1-septate, brown when mature, slightly constricted at the septum. Asexual states: Unknown.

Notes: Trichasterina was established by Arnaud (1918) based on Trichasterina styracis (Theiss.) Arnaud and remained monotypic until Doidge (1942) added T. popowiae Doidge. Thyriothecia are typical of the family Asterinaceae, but differ only in that the superficial hyphae have setae in both species (Arnaud 1918, 3, Plate XXXIII, Doidge 1942, Plate IV). Whether such a minor character difference justifies separate genera should be tested using molecular data. However, we retain the genus as distinct pending futher study.

Type species: Trichasterina styracis (Theiss.) G. Arnaud, Annals d’École National d’Agric. de Montpellier, Série 2 16(1–4): 172 (1918) [1917]