Studies on hyphomycetes—I
Taxonomic notes on some interesting Hyphomycetes are presented in this paper. On the basis of study of type material of three species ofHelminthosporium (H. obclavatulum Bubak and Sydow,H. bombycinum Speg. andH. polyphragmium H. and P. Sydow),H. obclavatulum is removed toSporidesmium asS. obclavatulum (Bubak and Sydow) comb. nov.;Helminthosporium bombycinum is placed in the genusOrmathodium asO. bombycinum (Speg.) comb. nov.;Helminthosporium polyphragmium is considered to be a synonym ofCorynespora cassiicola (Berk. and Curt.) Wei. Type material of two species ofClasterosporium (C. densum H. and P. Sydow, andC. degenerans H. and P. Sydow) was also studied. Both species are described in detail.C. densum is a dematiaceous fungus producing dictyospores acrogenously and singly on conidiophores which have conspicuous annellations; further, the mycelium of this species is not hyphopodiate.C. densum is, therefore, considered distinct from the genusClasterosporium (which has hyphopodiate mycelium and produces phragmospores) and placed in a new genusAnnellophorella asA. densa (H. and P. Sydow) comb. nov.Clasterosporium degenerans is a moniliaceous fungus with hyaline mycelium and hyaline dictyospores; the mycelium is not hyphopodiate. These features exclude this fungus from the genusClasterosporium. It is made the type of a new genus,Hyalodictys and the new combination,H. degenerans (H. and P. Sydow) Subram. is proposed. A dematiaceous phragmospored fungus found in association withHelminthosporium polyphragmium Sydow in the type material of this species was also studied and is considered to be aSporidesmium; it appears to be distinct from species of this genus so far known and is given a new name,Sporidesmium camelliæ-japonicæ.