Capnodiales » Extremaceae


Pseudoramichloridium Cheew. & Crous, in Cheewangkoon et al., Persoonia 23: 75 (2009).

         Index Fungorum number: IF 513854; Facesoffungi number: FoF 06851, 3 morphological species (Species Fungorum 2022), 2 species with molecular data.

 Saprobic or pathogenic on host. Sexual morph: Unknown. Asexual morph: Mycelium consisting of submerged and aerial hyphae; submerged hyphae pale to medium olivaceous-brown, thin- to slightly thick-walled; aerial hyphae smooth or verrucose, narrower and darker than the submerged hyphae. Conidiophores unbranched, slightly thick-walled, darker than the subtending hyphae, arising vertically from submerged or creeping aerial hyphae, with additional thin septa. Conidiogenous cells integrated, terminal, proliferating sympodially, giving rise to a long rachis with crowded, polyblastic scars that are protruding, somewhat prominent, thickened along the rim, slightly reflective, somewhat darkened. Conidia obovoid to fusiform, thin-walled, smooth to verruculose, aseptate, pale brown, solitary, aseptate, subhyaline to pale brown, smooth to slightly verruculose, with truncate base; hilum thickened, slightly reflective, somewhat darkened; conidial secession schizolytic. Colonies are dark olivaceous and slow-growing on MEA, and exophiala-like states are absent (adapted from Cheewangkoon et al. 2009).

Type species: Pseudoramichloridium henryi Cheew. & Crous

Notes: Pseudoramichloridium is characterised by pale to medium olivaceous-brown mycelium, unbranched conidiophores, integrated, terminal conidiogenous cells, and obovoid to fusiform conidia. Pseudoramichloridium morphologically resembles Ramichloridium (Mycosphaerellaceae) in having a pigmented, unbranched, sympodially proliferating rachi producing aseptate, pigmented conidia, and lacking exophiala-like states (de Hoog 1977; Arzanlou et al. 2007). Pseudoramichloridium differs from Ramichloridium in having colonies that are dark olivaceous and slow-growing on MEA, and conidial scars and hila that are slightly thickened, darkened and rather refractive. Pseudoramichloridium is morphologically and phylogenetically a distinct genus in Extremaceae. Molecular markers available for Pseudoramichloridium are ITS, LSU, actin, BTUB, Calmodulin, RPB2, TEF-1.


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