Pleosporales » Pleosporales, genus incertae sedis

Hobus

Hobus Jaklitsch & Voglmayr, Stud. Mycol. 85: 52 (2016).

Index Fungorum number: IF 817778; Facesoffungi number: FoF 11810, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Saprobic on host. Sexual morph:  Ascomata erumpent from bark through fissures as groups of black, papillate or cylindrical ostiolar necks, free to nearly completely incorporated by stromatic tissue. Stroma compact, forming a textura oblita, at upper levels a textura intricata of densely interwoven, thick-walled, hyaline to brownish hyphae and roundish cells, delimited by a brown subiculum. Ascomata scattered to more commonly aggregated in variable numbers within stromatic tissue. Peridium carbonaceous, brittle, complex, pseudoparenchymatous, not clearly delimited outside, dark reddish brown in glycerol, black in KOH. Ostioles periphysate. Hamathecium of numerous narrow pseudoparaphyses and apically free paraphyses. Asci clavate, fissitunicate, thick-walled, with a small ocular chamber, 8 biseriately arranged ascospores, an up 30 μm long stipe and a furcate base with croziers. Ascospores fusoid with the second cell slightly enlarged, with several slightly constricted eusepta, dark brown, end cells sometimes slightly paler; wall thick, verruculose. Asexual morph: Unknown (adapted from Jaklitsch and Voglmayr 2016).

 

Type species: Hobus wogradensis Jaklitsch & Voglmayr

 

Notes: Hobus is characterised by erumpent ascomata, pseudoparenchymatous peridium, fusoid dark brown ascospores. Hobus differs from other members of Pleosporales in having a well-developed stroma and formation of a diffusing reddish pigment in fresh cultures especially on MEA and PDA (Jaklitsch & Voglmayr 2016). The taxonomic placement of Hobus is uncertain and is currently in Pleosporales, genera incertae sedis. More collections with DNA sequence data are needed to confirm the taxonomic placement of the genus. Molecular markers available for Hobus are ITS, SSU, RPB2 and TEF-1.

 

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