Hemidothis
Hemidothis Syd. & P. Syd., Annls mycol. 14(1/2): 95 (1916)
Ascomycota, genera incertae sedis
Saprobic or parasitic on Miconia sp. (Melastomataceae) or Lauraceae in the tropics (Hanlin 1997). Sexual morph: undetermined. Asexual morph: Conidiomata black, stromatic, pycnidial, gregarious, superficial, discoid, orbicular to irregular, multilocular, glabrous. Ostiole absent, dehiscence by breakdown of upper wall. Conidiomatal wall composed of thick-walled, pale brown to brown cells of textura angularis. Conidiophores arising from the inner layers of locular wall, hyaline, cylindrical to irregular, branched at the base, septate, smooth-walled. Conidiogenous cells hyaline, enteroblastic, phialidic, cylindrical to ampulliform, integrated, determinate, smooth-walled. Conidia hyaline, long-fusiform, curved to sigmoid, 3-septate, smooth-walled, guttulate (adapted from Morgan-Jones et al. 1972d).
Type species: Hemidothis miconiae Syd. & P. Syd., Annls mycol. 14(1/2): 95 (1916)
Notes: Hyaline, long-fusiform, curved to sigmoid conidia and phialidic conidiogenous cells of Hemidothis resembles asexual morph of Dermea (= Foveostroma). Dermea has stromatic, pulvinate, furfuraceous or pruinoseconidiomata produced 1-sepate conidia, whereas Hemidothis has stromatic, pycnidial conidiomata produced 3-sepate conidia (Nag Raj and DiCosmo 1980, this study).
Hemidothis has been poorly studied, and the sexual morph is unclear. Petrak (1927, 1929), Sydow (1930) and Burton (1943) showed the connection between Hemidothis and Bagnisiopsis Theiss. & Syd. However, Hanlin (1997) listed Hemidothis as the asexual morph of Coccodiella Hara represented by C. melastomatum (Lév.) I. Hino & Katum., which causes lesions on leaves of Miconia sp. Six epithets are listed in Index Fungorum (2019), but none of them been revised with molecular data. Therefore, fresh material and DNA sequence analyses are needed to clarify the taxonomy of Hemidothis.
Distribution: Brazil, Dominican Republic, India, Venezuela.
References:
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.
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