Ascomycota, genera » Ascomycota, incertae sedis


Xenidiocercus Nag Raj, Coelomycetous Anamorphs with Appendage-bearing Conidia : 975 (1993)


Ascomycota, genera incertae sedis


Parasitic on living leaves, forming circular to irregular, yellow-brown to dark brown lesions with a diffuse margin merging gradually into healthy green tissue (Wu and Sutton 1995). Sexual morph: undetermined. Asexual morph: Conidiomata yellow-brown to dark brown, pycnidial, solitary to gregarious, immersed, globose to subglobose, unilocular, glabrous, ostiolate. Ostiole single, circular, centrally located. Conidiomatal wall composed of thick-walled, brown to dark brown cells of textura angularis in the exterior, gradually merging with thin-walled, pale brown to hyaline cells towards inner layers, becoming thick-walled, dark brown to black cells in the ostiolar region. Conidiophores arising from the inner wall layer of conidiomata, hyaline, cylindrical, unbranched or branched, septate, smooth-walled. Conidiogenous cells hyaline, enteroblastic, annellidic, cylindrical to lageniform, integrated or discrete, indeterminate, smooth-walled, with several percurrent proliferations. Conidia hyaline, ellipsoid to oblong or clavate, or pyriform to ovoid, unicellular, smooth-walled, with a hyaline, cylindrical to subcylindrical, unbranched, cellular appendage at the base (adapted from Nag Raj 1993, Wu and Sutton 1995).


Type species: Xenidiocercus macarangae (T.S. Ramakr.) Nag Raj, Coelomycetous Anamorphs with Appendage-bearing Conidia: 977 (1993)


Notes: Xenidiocercus was proposed by Nag Raj (1993) for a segregate? from Idiocercus, X. macarangae. Wu and Sutton (1995) re-examined type specimens of I. pirozynskii and X. macarangae and accepted Nag Raj’s concept. Two additional species, X. macrospora on leaves of Macaranga rowlandii and X. pyriformis on leaves of M. huraefolia (Euphorbiaceae) were included in Xenidiocercus. These two species differ from the type species in having wider and ellipsoidal or pyriform conidia.


Distribution: Ghana, India, Sierra Leone (Nag Raj 1993, Wu & Sutton 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.





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