Ascomycota, genera » Ascomycota, incertae sedis


Strasseriopsis B. Sutton & Tak. Kobay., Mycologia 61(6): 1068 (1970) [1969]

Facesoffungi number: FoF 07709

Ascomycota, genera incertae sedis


Parasitic on stem and twig of Tsuga sieboldii (Pinaceae). Sexual morph: undetermined. Asexual morph: Conidiomata dark brown to black, stromatic, sclerotioid and hypocrelloid, pycnidial, solitary, seemingly superficial but erumpent, multilocular, with immersed locules arranged peripherally in the same plane, glabrous, ostiolate. Ostiole single to each locule, circular, papillate, centrally located. Conidiomatal wall composed of thick-walled, dark brown cells of textura globulosa in the exterior, gradually merging with thin-walled, paler cells towards inner part, becoming thin-walled, pale brown to hyaline cells of textura porrecta in the interlocular wall. Conidiophores reduced to conidiogenous cells. Conidiogenous cells arising from inner layers of each locular wall, hyaline, holoblastic, ampulliform, lageniform or subglobose, discrete, determinate, smooth-walled. Conidia hyaline, ovoid to broadly fusiform, unicellular, smooth-walled, bearing a narrow-conic, short, apical appendage, and a filiform, tubular, unbranched, flexuous basal appendage (adapted from Nag Raj 1993).


Type species: Strasseriopsis tsugae (Tak. Kobay.) B. Sutton & Tak. Kobay., Mycologia 61(6): 1069 (1970) [1969]


Notes: The conidia of Strasseriopsis closely resemble those of Eleutheromyces, but it was distinguished from the latter by its conidiogenous cells and conidiomata structure (Nag Raj 1993, Crous et al. 2015d). Strasseriopsis has superficial, pycnidial, multilocular conidiomata, which is similar to entomopathogenic fungi (e.g., Aschersonia, Moelleriella and Samuelsia). Aschersonia and Moelleriella have fusiform conidia, Samuelsia has allantoid conidia lacking appendages, whereas Strasseriopsis has ovoid to broadly fusiform conidia bearing an appendage at each end (Chaverri et al. 2008, Tibpromma et al. 2017). In addition, Aschersonia, Moelleriella and Samuelsia have paraphyses, a feature absent in Strasseriopsis.

Strasseriopsis remains monotypic, and the sexual morph is undetermined. Strasseriopsis tsugae is associated with blight disease on Tsuga sieboldii in Japan (Sutton and Kobayashi 1969). To clarify the taxonomic treatment of Strasseriopsis, the type species will have to be recollected and epitypified.


Distribution: Japan (Sutton and Kobayashi 1969).






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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