Yoshinagaia Henn., Hedwigia 43(2): 143 (1904)
= Japonia Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 118: 879 [67 repr.] (1909)
Ascomycota, genera incertae sedis
Saprobic on the host plant in terrestrial habitat. Sexual morph: see Sivanesan & Hsieh (1995). Asexual morph: Conidiomata dark brown to black, pycnidial, epiphyllous, solitary to gregarious or confluent, superficial, with a very short stipe, globose to discoid, unilocular, glabrous, somewhat rough on the exterior, lacking ostiole. Conidiomatal wall thick-walled all around except at the base where it thins out and merges with the basal stroma; basal stroma pulvinate, of textura prismatica with thick-walled, dark brown cells in the outer layers, becoming paler towards the conidia hymenium; upper and lateral wall of textura angularis with thick-walled, dark brown, verruculose cells. Conidiophores arising from the innermost layers of basal wall, hyaline, branched, septate, smooth-walled. Conidiogenous cells hyaline, holoblastic, cylindrical, usually integrated, indeterminate, smooth-walled. Conidia hyaline, smooth-walled, guttulate, composed of conidium body and an apical appendage delimited by a septum; conidium body clavate to fusiform, 3-septate, constricted at septa; central cell longer than apical cell and basal cell; basal cell subcylindrical, with a truncate base, straight or slightly curved; apical appendage arising as a tubular extension of the conidium body and separated from it by a septum, branched, attenuated, tubular, flexuous.
Type species: Yoshinagaia quercus Henn., Hedwigia 43(2): 143 (1904)
Notes: Hennings (1904) described Yoshinagaia to accommodate Y. quercus, a fungus collected from leaves of Quercus glauca (Fagaceae). von Höhnel (1909) re-examined part of the type specimen deposited in Berlin and found another two coelomycetes on the type material. He described these two as new genera, and stated one of them, Japonia Höhn. has closely affinity with Yoshinagaia. Sivanesan & Hsieh (1995) reappraised Yoshinagaia based on a collection from Taiwan, and confirmed J. quercus (type species of Japonia) is an asexual morph of Yoshinagaia by development of both sexual and asexual morph within the same stromatic locule. Yoshinagaia was placed in the Dothioraceae based on ascomatic, hamathecial, ascus and ascospore character. This concept was followed by Barr (2001). According to International Code of Nomenclature for Algae, Fungi, and Plants (ICN; Melbourne Code), Yoshinagaia (1904, sexual morph) is the preferred earlier name over Japonia (1909, asexual morph) (Wingfield 2011). Yoshinagaia is a monotypic genus. There is no molecular data available for Yoshinagaia. Fresh collections of both sexual and asexual morph are needed to confirm this connection.
Distribution: China, Japan (Nag Raj 1993, Sivanesan and Hsieh 1995).
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.