Chaetosphaerulina I. Hino, Bull. Miyazaki Coll. Agric. Forest. 10: 62 (1938).
Index Fungorum number: IF 971; Facesoffungi number: FoF 06816, 6 morphological species (Species Fungorum 2022), no molecular data available.
Parasitic on leaf surface of Comocladia glabra. Subiculum orbicular, slightly transparent, inconspicuous, loosely attached to epidermis, branching, radial hyphae. Sexual morph: Ascomata superficial, globose, solitary, yellow brown to brown, membranous, developing at centre of subiculum, minutely papilla, ostiolate, collapsing when dry, lacking pseudoparaphyses. Asci 8-spored, bitunicate, cylindrical-ellipsoid, bluntly rounded at apex, with a short, bifurcate pedicel. Ascospores 2-seriate in ascus, cylindrical fusoid, tapering towards sub-rounded ends, slightly inequilateral or curved, 7–9-septate, slightly constricted at septum, hyaline, smooth-walled, lacking a gelatinous sheath. Asexual morph: Unknown (adapted from Boonmee et al. 2011).
Type species: Chaetosphaerulina yasudae I. Hino
Notes: Chaetosphaerulina is characterised by solitary, yellow brown to brown ascomata, cylindrical-ellipsoid asci bluntly rounded at apex and cylindrical fusoid ascospores lacking a gelatinous sheath. Crane et al. (1998) reinstated Chaetosphaerulina to include C. yasudae and two species previously placed in Thaxterielliopsis, C. bambusicola and C. lignicola. Chaetosphaerulina resembles Tubeufia but can be differentiated based on the brownish pigmentation of the ascomata and hyphal appendages that adhere together as stiff setae. Boonmee et al. (2011) re-described Chaetosphaerulina and provided an illustration re-drawn from the original protologue since the holotype specimen at YAM is lost. Chaetosphaerulina is currently a distinct genus in Tubeufiaceae but molecular data is lacking. Fresh collections with DNA sequence data are needed to confirm the taxonomic placement of the genus. The type species must be re-collected and Chaetosphaerulina must be epitypified.
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