Clarohilum
Clarohilum Videira & Crous, in Videira et al., Stud. Mycol. 87: 334 (2017).
Index Fungorum number: IF 822583; Facesoffungi number: FoF 08487, 1 morphological species (Species Fungorum 2021), 1 species with molecular data.
Associated with disease caused by other fungi. Sexual morph: Ascomata globose, subepidermal, mostly epiphyllous, brown or dark brown, ostiolate, thin wall composed of pseudoparenchymatous cells. Asci cylindrical, tapering towards the base, bitunicate, thick-walled, 8-spored. Ascospores hyaline, tapering at both ends, two-celled with the upper cell slightly broader than the lower. Asexual morph Conidiophores mononematous, pale olivaceous brown, not branched, with slight geniculations, septate. Conidiogenous cells terminal, elongating sympodially, polyblastic, with conidiogenous loci thickened and darkened, located both apical and laterally. Conidia single, pale olivaceous, smooth, obovoid, obclavate, cylindrical to long-obclavate, slightly curved, apex obtuse, base rounded or short obconicaly truncate, septate, hila thickened, darkened and usually protruding (adapted from Videira et al. 2017).
Type species: Clarohilum henningsii (Allesch.) Videira & Crous
Notes: Clarohilum is characterised by globose, subepidermal ascomata, cylindrical asci, and hyaline ascospores. The type species, previously known as Passalora henningsii has paler caespituli compared to other species of Passalora s. lat. and has conidia with distinctly protruding hila. In the phylogenetic analysis of Videira et al. (2017), Clarohilum formed a single lineage close to Nothopassalora. Clarohilum differs from Nothopassalora in having fewer protruding hila that tapered towards the base like some of the conidia. Clarohilum is a distinct and well-supported genus in Mycosphaerellaceae. Molecular markers available for Clarohilum are ITS, LSU, RPB2 and TEF-1.
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