Caribaeomyces Cif., Atti Ist. bot. Univ. Lab. crittog. Pavia, sér. 5 19: 98 (1962).
Index Fungorum number: IF 822; Facesoffungi number: FoF xx, 1 morphological species (Species Fungorum 2022), molecular data unavailable.
Biotrophic on upper surface of leaves, not forming leaf spots and hyphae not penetrating into the plant cells, superficial mycelium present, with hyphopodia. Sexual morph: Thyriothecia circular, gregarious or solitary, superficial, crustose to subcarbonaceous, brown to black, basal peridium poorly developed, with a central dehiscing irregular rounded ostiole; in section lenticular. Upper wall consisting of radially arranged angular cells in parallel lines. Peridium comprising two strata, outer cells pseudoparenchymatous, pigmented thick wall, tightly arranged, inner cells of textura prismatica, pale brown. Hamathecium comprising asci inclined towards the central ostiole, pseudoparaphyses not observed. Asci 4-spored, bitunicate, fissitunicate, obclavate, apedicellate, apically rounded, ocular chamber not apparent, not bluing in IKI. Ascospores overlapping biseriate, clavate, upper cell wider and shorter than lower cell, hyaline, two-celled, septum central, with guttules in each cell, wall smooth. Asexual morph: Unknown (Adapted from Wu et al. 2011).
Type species: Caribaeomyces tetrasporus (Toro) Cif.
Notes: Caribaeomyces was introduced by Ciferri (1962) with C. tetrasporus as type species. Caribaeomyces is characterised by gregarious or solitary, superficial, crustose to subcarbonaceous thyriothecia, peridium comprising inner cells of pale-brown textura prismatica. Ciferri (1962) referred Caribaeomyces to Microthyriaceae and this was followed by consequent authors (Kirk et al. 2008; Lumbsch and Huhndorf 2010). Caribaeomyces resembles members of Microthyriaceae in having dimidiate thyriothecia with radiating cells, and bitunicate cylindrical asci and two-celled ascospores but the presence of a central dehiscing rounded ostiole resembles more like species of Asterinaceae. Caribaeomyces is currently placed in Asterinales genera incertae sedis but molecular data is lacking. Fresh specimen and more taxa with DNA sequence data are needed to confirm the taxonomic placement of Caribaeomyces.