Capnodiales » Teichosporaceae

Pseudocyclothyriella

Pseudocyclothyriella Phukhams. & Phookamsak, in Jiang et al., Frontiers in Microbiology 12(no. 656235): 8 (2021).

Index Fungorum number: IF 557441; Facesoffungi number: FoF 09539, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Saprobic on Clematis vitalba (Ranunculaceae). Sexual morph: Unknown. Asexual morph: Conidiomata pycnidial, solitary to gregarious, uniloculate, immersed to erumpent, laterally becoming superficial, visible as black, shiny on host, subglobose to subconical, coriaceous, subcoriaceous at the outer layers, glabrous, dark brown to black, ostiolate, papillate. Ostioles central, ovoid, with minute papilla, filled with hyaline periphyses. Pycnidial wall thick-walled of equal thickness, composed of multilayered scleroplectenchymatous cells, outer layer composed of several layers of thick-walled, dark brown to black cells of textura angularis to textura globulosa, inner layer composed of hyaline to pale brown cells, bearing conidiogenous cells. Conidiophores reduced to conidiogenous cells. Conidiogenous cells holoblastic, phialidic, determinate, discrete, cylindrical to subcylindrical, or ampulliform, hyaline, aseptate, smooth-walled, arising from the inner layers of conidioma. Conidia oval to oblong, hyaline to yellowish brown, slightly curved toward the ends, aseptate, smooth-walled (adapted from Jiang et al. 2021).

Type species: Pseudocyclothyriella clematidis (Phukhams. & K.D. Hyde) Phukhams. & Phookamsak

Notes: Pseudocyclothyriella is characterised by pycnidial, solitary to gregarious, uniloculate conidiomata, holoblastic, phialidic, determinate, discrete, cylindrical to subcylindrical conidiogenous cells and oval to oblong, hyaline to yellowish brown conidia. Pseudocyclothyriella was previously described as Pseudocoleophoma clematidis but was not congeneric with the type species of Pseudocoleophoma, P. calamagrostidis. Pseudocyclothyriella is closely related to Immotthia and Pseudocoleophoma with strong statistical support. Pseudocyclothyriella resembles Cyclothyriella in having cylindrical, oblong to ellipsoid, aseptate, hyaline to pigmented conidia (Jaklitsch & Voglmayr 2016). Pseudocyclothyriella differs from Cyclothyriella in having solitary to gregarious, immersed to erumpent, black, shiny, subglobose to subconical conidiomata, with oval, papilla, ostiolar canal, and pycnidial wall comprising thick-walled scleroplectenchymatous cells while Cyclothyriella has black, rather globose pycnidia, grouped in valsoid configuration, with radiantly colored, disc-like ostiole, and pycnidial wall comprising pseudoparenchymatous cells. Pseudocyclothyriella is however, phylogenetically distant from Cyclothyriella since the latter belongs to Cyclothyriellaceae while Pseudocyclothyriella clusters with members of Dictyosporiaceae. Pseudocyclothyriella morphologically differs from Pseudocoleophoma in that the latter has a pycnidial wall comprising thin-walled, brown to dark brown pseudoparenchymatous cells and oblong, cylindrical to subcylindrical, or rod-shaped, 0–1-septate, smooth-walled conidia (Li et al. 2020). Pseudocyclothyriella produces coniothyrium-like asexual morph similar to Immotthia but differs in that the latter forms clusters of pycnidia, and multiloculate conidiostromata while Pseudocyclothyriella forms solitary to gregarious, uniloculate pycnidia and oval to oblong conidia (Phukhamsakda et al. 2020). Pseudocyclothyriella has a saprobic lifestyle while Immotthia has a hyper parasitic life mode (Phukhamsakda et al. 2020). Pseudocyclothyriella is morphologically and phylogenetically a distinct and well-defined genus in Teichosporaceae. Molecular markers available for Pseudocyclothyriella include ITS, LSU, SSU and TEF-1.

 

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