Chaetothyrina Theiss., Annls mycol. 11(6): 495 (1913)
Index Fungorum number: IF 976; Faceoffungi number: FoF 06974, 15 morphological species (Species Fungorum, 2022), 4 species with molecular data.
Epiphytic on stems, leaves or fruit surfaces, as very small, black, shiny dots, with long setae. Sexual morph: Thyriothecium superficial, easily removed from host, circular, brown to dark brown, rounded and darkened at the margin, base poorly developed, with long setae, lacking superficial mycelium. Setae straight, rounded at the apex, unbranched, with dark septa, brown to dark brown. Upper wall comprising brown to dark brown cells of textura epidermoidea. Hamathecium comprising septate, hyaline, pseudoparaphyses. Asci 8-spored, bitunicate, broadly obovoid to pyriform, apically rounded, with an ocular chamber, smooth-walled. Ascospores 2–3- seriate, broadly ellipsoidal to fusoid, 1-septate, slightly constricted at the septum, hyaline, smooth-walled, upper cell mostly larger than lower cell, base with rounded ends (Adapted from Singtripop et al., 2016).
Type species: Chaetothyrina musarum (Speg.) Theiss.
Notes: Chaetothyrina was introduced by Theissen (1913) to accommodate Chaetothyrium musarum Speg. (1899). Chaetothyrina is unique in having inconspicuous superficial hyphae, dark brown thyriothecia with setae and one-septate ascospores. Chaetothyrina was placed in Phaeothecoidiellaceae, Capnodiales by Hongsanan et al. (2017).
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