Chaetoconis
Chaetoconis Clem., Gen. fung. : 125 (1909)
Sordariomycetes, Diaporthomycetidae, Diaporthales, Diaporthaceae
Saprobic on the host plant in terrestrial habitat, such as on dead stems of Polygonum alpinum , P. polymorphum (Polygonaceae), Rumex acetosa, R. crispus (Polygonaceae) and Vaccinium uliginosum (Ericaceae). Sexual morph: undetermined. Asexual morph: Conidiomata dark brown, stromatic, pycnidial, solitary to gregarious, subperidermal, immersed to erumpent, globose to depressed globose or conical in sectional view, unilocular to multilocular, thick-walled, glabrous, ostiolate. Ostiole single or more, cylindrical to subcylindrical, sometimes papillate. Conidiomata wall composed of thick-walled, dark brown cells of textura angularis in the outer layer, gradually merging with pale brown to hyaline cells of textura prismatica towards hymenium. Conidiophores formed from the innermost cells of conidiomata, hyaline, septate, branched, smooth-walled, invested by mucus. Conidiogenous cells enteroblastic, phialidic, hyaline, discrete or integrated, subcylindrical to cylindrical or irregular, smooth-walled. Conidia hyaline, obclavate, ellipsoidal or irregular, septate, thick-walled, guttulate, apical cell attenuated into a tubular, flexuous, unbranched or occasionally forked appendage.
Type species: Chaetoconis polygoni (Ellis & Everh.) Clem., Gen. fung.: 176 (1909).
Notes: Sutton (1968) re-described the genus and accepted Chaetoconis and C. polygoni as validly published, while Pirozynski and Morgan-Jones (1968) gave a detailed list of synonyms of the genus. Nag Raj (1993) accepted two species, C. polygoni and C. vaccinii Melnik & Nag Raj. De Gruyter et al. (2009) and Senanayake et al. (2017) showed that Chaetoconis is related to Diaporthaceae in Diaporthales based on sequence analysis. The sexual morph of Chaetoconis has been connected to Ceriospora polygonacearum (Petr.) Piroz. & Morgan-Jones (Petrak 1959, Pirozynski and Morgan-Jones 1968), but this connection has not been confirmed by molecular data. We provide detailed descriptions and photo palates for two Chaetoconis species. In the future, more collections need to be brought into culture and subjected to DNA analysis to confirm its generic placement and to link its sexual morph.
Distribution: Germany, Russia, Sweden, UK, USA (Nag Raj 1993, this study).
Key to species of Chaetoconis
1. Conidiomata globose, conidia 2-septate, with unbranched appendages............................ ....................................................................................................................... C. polygoni
1. Conidiomata broadly conical to depressed globose, conidia 4-septate, with forked appendages...................................................................................................... C. vaccinii
References:
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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