Cleistosphaera
Cleistosphaera Syd. & P. Syd., Annls mycol. 14(1/2): 74 (1916).
Index Fungorum number: IF 1100; Facesoffungi number: FoF 03669, 3 morphological species (Species Fungorum 2022), no molecular data available.
Parasitic or saprobic on leaves. Sexual morph: Ascomata superficial, grouped or solitary, uniloculate, globose to subglobose, with a subiculum, with apical pore, dark brown, covered with, branched, septate, dark brown mycelium, hyphopodia, subglobose and dark brown. Hamathecium comprising sparse, septate, hyaline, pseudoparaphyses constricted at the septa. Peridium comprising 2–3 layers of dark brown cells of textura angularis. Asci 8-spored, bitunicate, ovoid to broadly clavate, sessile or with knob-like pedicel, apically thickened and rounded, with small ocular chamber. Ascospores 2–3-seriate, ellipsoid to oblong, 1-celled, hyaline to pale grey, surrounded by thin gelatinous sheath, with granular contents. Asexual morph: Coelomycetous associated with Cleistosphaera macrostegia. Pycnidia superficial, globose to subglobose, dark brown, apical pore not seen. Peridium comprising 2–3 layers of brown cells of textura angularis, conidiophores and conidiogenous cells not seen. Conidia subglobose to ellipsoidal, 1-celled, hyaline to brown, guttulate, smooth-walled (adapted from Boonmee et al. 2017).
Type species: Cleistosphaera macrostegia Syd. & P. Syd.
Notes: Cleistosphaera is characterised by superficial, grouped or solitary ascomata, ovoid to broadly clavate asci, sessile or with knob-like pedicel, and 2–3-seriat ellipsoid to oblong, 1-celled, hyaline to pale grey ascospores. The asexual morph is coelomycetous characterised by superficial, globose to subglobose, dark brown pycnidia, and subglobose to ellipsoidal, 1-celled, hyaline to brown conidia. Cleistosphaera differs from all genera in Perisporiopsidaceae in having phoma-like conidia while those of Perisporiopsidaceae are hyphomycetous. Cleistosphaera resembles members of Botryosphaeriaceae in asci and ascospore morphology but differs in having mycelium with hyphopodia. Molecular data is lacking. Fresh collections with DNA sequence data are needed to confirm the taxonomic placement of Cleistosphaera.
Recent News
Recent paper to be publishedRecent Genus
NothocladosporiumPhillipsiella
Curreya
Recent Species
Nothocladosporium syzygiiPhillipsiella atra
Curreya conorum
