Indexfungorum number: IF897
Sexual morph: Stromata absent. Ascomata globose to pyriform, often irregular in shape due to compression, deeply immersed to almost superficial, dark brown to black, carbonaceous, with a long cylindrical black or yellow crystals, thick-walled neck which is easily detached, scattered to densely aggregated. Peridium composed of a large number of layers of very thick-walled rather small cells in the neck region. Interascal tissue of paraphyses thin-walled, probably evanescent at maturity, periphyses well-developed. Asci 8-spored, unitunicate, cylindrical, fairly thin-walled, the truncate apex, with a conspicuous, J-, apical ring. Ascospores arranged biseriately, narrowly cylindric-fusiform, filiform, the ends acute, often slightly curved, thin-walled, hyaline, guttulate, smooth-walled. Asexual morph: Harpophora-like. Phialides or short conidiophores arising on aerial hyphae, conidial heads slimy, inconspicuous, and transparent. Conidiogenous cells phialidic, ampulliform to lageniform, terminal or intercalary, hyaline to subhyaline, cylindrical. Conidia cylindrical with curvature, hyaline, narrowly rounded at bothends, aseptate, smooth.
Notes: The genus Ceratosphaeria was introduced by Niessl (1876) with C. lampadophora as the type species and it is morphologically characterized in having globose to pyriform, immersed to almost superficial, dark coloured stromatic ascomata, leathery to fragile perithecial walls, cylindric-clavate, short-stipitate asci, truncate to broadly rounded at the apex, with an apical annulus and allantoid to suballantoid, pale brown, aseptate ascopores (Niessl1876; Re´blova´2006). In this study, we introduce two new species in Ceratosphaeria. Five species in this genus have been recorded from freshwater habitats.
Type species: Ceratosphaeria lampadophora (Berk. & Broome) Niessl, Verh. nat. Ver. Brünn 14: 203 (1876)
Ceratosphaeria aquatica Luo et al.
Ceratosphaeria lampadophora (Berk. & Broome) Niessl
Ceratosphaeria phialidica (Shearer) Huhndorf et al.
Ceratosphaeria pusilla (Fuckel) Sacc
Ceratosphaeria lignicola Bao et al.