Pleosporales » Melanommataceae

Pleotrichocladium

Pleotrichocladium Hern. -Restr., R.F. Castañeda & Gené, in Hernández-Restrepo et al., Stud. Mycol. 86: 74 (2017).

 Index Fungorum number: IF 820277; Facesoffungi number: FoF 08298, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Saprobic on host. Sexual morph: Unknown. Asexual morph: Mycelium superficial and immersed, composed of branched, septate, hyaline to pale brown, smooth hyphae. Conidiophores micronematous, reduced to a hyphal cell that extents laterally to form a conidium or arising as short lateral pedicels on the hyphae, unbranched or loosely branched. Conidiogenous cells integrated, mono- and polyblastic, cylindrical, subglobose or barrel-shaped, subhyaline to pale brown, smooth. Conidial secession schizolytic. Conidia solitary, septate, ovoid, ellipsoid to clavate, straight or curved, brown and smooth (adapted from Hernandez-Restrepo et al. 2017).

 Type species: Pleotrichocladium opacum (Corda) Hern. -Restr., R.F. Castañeda & Gené

Notes: Pleotrichocladium is characterised by superficial and immersed mycelium, micronematous conidiophores, mono- and polyblastic conidiogenous cells, and solitary, septate, ovoid, ellipsoid to clavate conidia. Pleotrichocladium is morphologically similar to Trichocladium but phylogenetically related to Pleosporales. Pleotrichocladium opacum was previously known as Sporidesmium opacum described from dead wood in Reichenberg (Czech Republic) by Corda (1837). Afterwards, Hughes (1952) re-described and illustrated Sporidesmium opacum and considered it congeneric with T. asperum. The holotype specimen of S. opacum is lost and Hernandez-Restrepo et al. (2017) designated a lectotype of S. opacum based on the illustration (Fig. xx) available in the original protologue and chose an ex-epitype culture. Hughes (1958) considered Sporidesmium ovoideum, S. fasciculare and S. pyriforme conspecific with T. opacum, however these synonyms have not been confirmed. Hernandez-Restrepo et al. (2017) showed that several strains of T. opacum clustered in Melanommataceae which is in agreement with previous study by Mantle et al. (2006). Pleotrichocladium morphologically differs from Trichocladium in having pale brown conidiogenous cells and smooth conidia with schizolytic secession while the latter has hyaline conidiogenous cells, and warty conidia with rhexolytic secession. Pleotrichocladium is morphologically and phylogenetically a distinct genus in Melanommataceae. Molecular markers available for Pleotrichocladium are ITS, LSU, SSU.

 

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