Ascomycota, genera » Ascomycota, incertae sedis


Tribolospora D.A. Reid, Aust. J. Bot. 14: 31 (1966)

Facesoffungi number: FoF 07720

Ascomycota, genera incertae sedis


Saprobic on leaves of Sycopsis dunnii (Hamamelidaceae) (Reid 1966). Sexual morph: undetermined. Asexual morph: Conidiomata black, stromatic, pycnidial, with a small narrow stipe-like base, solitary to gregarious, superficial, orbicular, multilocular, glabrous. Ostiole single, circular, centrally located. Conidiomatal wall composed of thick-walled, dark brown, loosely interwoven hyphae of textura intricata in the base part, becoming almost hyaline, loosely arranged hyphae densely covered with a very fine brown granular deposit in the locular wall. Conidiophores reduced to conidiogenous cells. Conidiogenous cells arising from the inner wall layer of locular wall, hyaline, holoblastic, cylindrical to obclavate, attenuating apically into fine hair-like sterigmata, smooth-walled. Conidia hyaline, stellate, with 3–6 short protuberances, unicellular, smooth-walled, arising singly from the apex of the conidiogenous cells (adapted from Reid 1966).


Type species: Tribolospora sycopsidis D.A. Reid, Aust. J. Bot. 14: 31 (1966)


Notes: The conidiogenous cells of Tribolospora sycopsidis were described as phialides by Sutton (1980), but the original description is “The cavity is lined by conidiophores consisting of a narrow cylindrical body or alternatively of an obclavate structure, 58 by 22.5 µm, which in either instance is prolonged apically into a fine hair-like sterigma”. Morgan-Jones (1997) described and illustrated it as holoblastic conidiogenous cells. Based on Reid (1966) and Morgan-Jones (1997), we consider conidiogenous cells of T. sycopsidis are holoblastic rather than enteroblastic. Tribolospora is a monotypic genus. The conidia of Tribolospora are close to Asteroconium, but it was separated from the latter by its pycnidial conidiomata and holoblastic conidiogenous cells. There is no molecular data available for Tribolospora. To clarify the taxonomic placement of this genus, fresh collections of the type and cultures are needed.


Distribution: Australia (Reid 1966).






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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