Pleosporales » Melanommataceae

Bertiella

Bertiella (Sacc.) Sacc. & P. Syd., in Saccardo, Syll. fung. (Abellini) 14: 19 (1899).

Index Fungorum number: IF 553; Facesoffungi number: FoF 00760, 6 morphological species (Species Fungorum 2022), 3 species with molecular data.

Saprobic on woody hosts. Sexual morph: Ascomata gregarious sometimes confluent and in small groups, superficial, subglobose, with a flattened base, apapillate, black, carbonaceous. Peridium composed of few layers of pigmented cells of textura angularis, lower peridium thinner, composed of elongated, hyaline cells of textura globulosa. Hamathecium of long trabeculate pseudoparaphyses, numerous, persistent, filiform, branching and anastomosing between and above the asci. Asci 8-spored, bitunicate, cylindric-clavate, with short pedicel, apically rounded with ocular chambers. Ascospores biseriate, hyaline, becoming pale brown when senescent, fusiform, straight or curved, uniseptate, with 2–3 globules, becoming 3-septate when mature, constricted at septum, smooth-walled. Asexual morph: Unknown (adapted from Tian et al. 2015).

 

Type species: Bertiella macrospora (Sacc.) Sacc. & Traverso

 

Notes: Bertiella is characterised by gregarious sometimes confluent ascomata, bitunicate, cylindric-clavate asci and biseriate, hyaline,1-septate ascospores becoming pale brown 3-septate when mature. Eriksson and Yue (1986) re-studied the type specimen of B. macrospora and referred it to Massarina (as M. macrospora). Hyde et al. (2002) transferred Bertia macrospora to Lophiostoma as L. bertiellum based on morphological resemblance to Lophiostoma. Mugambi and Huhndorf (2009) provided sequence data from one isolate of B. macrospora which grouped with Byssosphaeria in Melanommataceae. Bertiella macrospora differed from members of Byssosphaeria in having a rough ascomatal surface that lacks hairs or a subiculum. In the phylogenetic analysis of Tian et al. (2015) based on LSU, SSU, RPB2 and EF-1α sequence data, the strain of B. macrospora (IL 5005) formed a distinct clade, close to Byssosphaeria in Melanommataceae. Several authors added new species to Bertiella (Hyde et al. 2018, Tennakoon et al. 2021, Niranjan and Sarma 2019). Bertiella is morphologically and phylogenetically a distinct and well-defined genus in Melanommataceae. Molecular markers available include LSU, SSU, ITS, TEF-1 and RPB2.

 

 

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