Diaporthales » Gnomoniaceae


Sirococcus Preuss, Linnaea 26: 716 (1855) [1853]

Facesoffungi number: FoF 06326

Sordariomycetes, Sordariomycetidae, Diaporthales, Gnomoniaceae


Saprobic or parasitic on the host plant. Sexual morph: undetermined. Asexual morph: Conidiomata brown to black, pycnidial, solitary to gregarious, immersed to erumpent, globose to subglobose, unilocular or multilocular, glabrous. Ostiole absent, dehiscence by breakdown of the upper wall. Conidiomatal wall composed of thick-walled, dark brown to hyaline cells of textura intricata to textura angularis. Conidiophores formed from inner layer of conidiomata, hyaline, cylindrical, branched, septate, smooth-walled. Conidiogenous cells hyaline, enteroblastic, phialidic, cylindrical, integrated or discrete, determinate, smooth-walled. Conidia hyaline, fusiform to cylindrical, 1-septate, smooth-walled, guttulate.


Type species: Sirococcus conigenus (Pers.) P.F. Cannon & Minter, Taxon 32(4): 577 (1983)


Notes: Sutton (1980) gave a full account of the taxonomy of Sirococcus and accepted two species, S. spiraea (Lebedeva) Petr. and S. strobilinus. Cannon and Minter (1983) considered Hypoderma conigenum (Pers.) DC. to be an earlier name for S. strobilinus and made the new combination, S. conigenus as the type species. This generic concept was followed by later authors (Bronson et al. 2003, Rossman et al. 2007, Sogonov et al. 2008, Crous et al. 2016a). Rossman et al. (2007) designated an epitype for S. conigenus on cones of Picea abies (Pinaceae) in Finland, and placed the genus in Gnomoniaceae. They also provided a detailed description and illustration. Crous et al. (2016a) added an additional species S. quercus Crous based on LSU and ITS sequence data. More than 40 taxa are listed in Index Fungorum (2019), but few have been studied with molecular data. A fresh collection (MFLU 15-1235) collected on P. abies from Italy clustered with the epitype (CBS 119615) and other collections of S. conigenus with high bootstrap support (100 MLBS /1 BPP) (Fig. 23). Morphologically, the fresh collection has similar form of conidiomata, conidiophores and conidia with the generic type of Sirococcus. Based on phylogeny, morphology and host, this collection is considered conspecific with Sirococcus conigenus. A detailed description and plate is provided. Sirococcus species are important pathogens causing shoot blight and tip dieback on conifers and canker on butternut (Nair et al. 1979, Konrad et al. 2007, Rossman et al. 2007). Further studies with fresh collections are needed to study the taxonomy, phylogeny and ecology of Sirococcus species.


Distribution: Austria, Canada, Finland, France, Germany, Latvia, Switzerland, UK, USA (Nair et al. 1979, Sutton 1980, Rossman et al. 2007, Crous et al. 2016a).






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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