A NEW HYPHOMYCETE GENUS, CONIOSCYPHOPSIS, FROM WOOD SUBMERGED IN A FRESH-WATER STREAM AND A REVIEW OF CONIOSCYPHA

Conioscypha is reviewed, with a discussion on generic concepts and con idiogenesis. A new genus, Conioscyphopsis, is described from submerged wood in Australia, and a key to species in both genera is provided. C onioscyphopsis australiensis sp. nov. is similar to species of Coniosc ypha in lacking conspicuous conidiophores, but its dematiaceous, unice llular conidia are produced from ampulliform conidiogenous cells borne on semi-immersed hyphae. Conioscyphopsis differs from Coniascypha mai nly in its conidiogenesis. Conidiogenesis in Conioscypha is intermedia te between 'annellidic' and 'phialidic', single conidia being produced endogenously within indeterminate, percurrently proliferating conidio genous cells. In Conioscyphopsis, conidiogenesis is 'enteroblastic-phi alidic', solitary conidia being produced exogenously from determinate, but percurrently regenerating conidiogenous cells.