Pleosporales » Tetraplosphaeriaceae


Pseudotetraploa Kaz. Tanaka & K. Hirayama, in Tanaka et al., Studies in Mycology 64: 193 (2009).

Index Fungorum number: IF 515257; Facesoffungi number: FoF 06669, 4 morphological species (Species Fungorum, 2022), 4 species with molecular data.

Saprobic on host. Asexual morph: Mycelium superficial. Conidiophores absent. Conidiogenous cells monoblastic, indistinguishable form creeping hyphae. Conidia composed of 4 to 8 columns, obpyriform to long obpyriform, brown to dark brown, almost smooth, verrucose at the base, pseudoseptate, with setose appendages at the apical part. Appendages mostly 4, rarely 6 to 8, curved or straight. Sexual morph: Unknown (Adapted from Tanaka et al., 2009).


 Type species: Pseudotetraploa curviappendiculata (Sat. Hatak., Kaz. Tanaka & Y. Harada) Kaz. Tanaka & K. Hiray.


Notes: Pseudotetraploa was introduced by Tanaka et al. (2009) with P. curviappendiculata as type species. Pseudotetraploa is characterized by superficial mycelium, monoblastic conidiogenous cells, obpyriform to long obpyriform, brown to dark brown conidia. Pseudotetraploa resembles Tetraploa in having similar conidia. Pseudotetraploa differs from Tetraploa in having setose appendages while the latter has long and straight appendages. Pseudotetraploa also resembles other genera such as Ceratosporella, Paratetraploa, Triposporium, Tretospeira in conidial morphology but differs in that the latter genera have macro- or semi-macronematous conidiophores. Tanaka et al. (2009) transferred three species previously placed in Tetraploa but was not congeneric with the type species of the genus, T. aristata to Pseudotetraploa. The species are Tetraploa curviappendiculata (= Pseudotetraploa curviappendiculata), Tetraploa javanica (= Pseudotetraploa javanica) and Tetraploa longissima (= Pseudotetraploa longissimi). Hyde et al. (2020b) added another species, P. rajmachiensis from decaying culms of Dendrocalamus stocksii (Poaceae). The sexual morph of Pseudotetraploa is yet to be discovered.  Pseudotetraploa is morphologically and phylogenetically a distinct genus in Tetraplosphaeriaceae. Molecular markers available for Pseudotetraploa include LSU, SSU, ITS, TEF-1 and β-tubulin.


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