Rachicladosporium
Rachicladosporium Crous, U. Braun & C.F. Hill, in Crous, Braun, Schubert & Groenewald, Stud. Mycol. 58: 38 (2007).
Index Fungorum number: IF 504430; Facesoffungi number: FoF 06634, 13 morphological species (Species Fungorum 2022), 13 species with molecular data.
Associated with leaf spot. Sexual morph: Unknown. Asexual morph: Mycelium consisting of branched, septate, smooth, hyaline to pale brown, thin-walled hyphae. Conidiophores erect, solitary, macronematous, arising from superficial hyphae, subcylindrical, straight to somewhat geniculate-sinuous, medium brown, finely verruculose; basal foot cell without swelling or rhizoids. Conidiogenous cells integrated, terminal, subcylindrical or tips slightly swollen, forming an apical rachis, multilocal, loci terminal and lateral, without evident sympodial proliferation (non-geniculate); conidiogenous loci inconspicuous or subconspicuous by being very slightly thickened along the rim, but neither darkened nor refractive, giving rise to simple or branched chains or solitary conidia. Ramoconidia medium brown, finely verruculose, 0–1-septate, subcylindrical to narrowly ellipsoid; conidia ellipsoid, pale brown, 0(–1)-septate, smooth to finely verruculose; hila inconspicuous; secession schizolytic (adapted from Crous et al. 2007).
Type species: Rachicladosporium luculiae Crous, U. Braun & C.F. Hill
Notes: Rachicladosporium differs from Cladosporium sensu stricto and related cladosporioid genera by having an apical conidiophore rachis with inconspicuous to subconspicuous scars and unthickened, not darkened-refractive conidial hila. Conidia are formed holoblastically and separated by a thin septum. Rachicladosporium is morphologically and phylogenetically a distinct and well-defined genus in Cladosporiaceae. LSU and ITS sequence data are available for Rachicladosporium.
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