Classification of the mycoparasite Gliocladium roseum in Clonostachys as C-rosea, its relationship to Bionectria ochroleuca, and notes on other Gliocladium-like fungi

Because the common soil fungus and mycoparasite Gliocladium roseum differs from the type species of Gliocladium, G. peniclllioides, in morphology ecology, teleomorph, and DNA sequence data, it is classified in a separate genus, Clonostachys. Penicillium roseum is the oldest available name for G. roseum and is recombined as C. rosea. Penicillium roseum described from potato in Germany, is neotypified by a conidial isolate originating from a fungal substratum in European soil. By choosing this strain as neotype for P. roseum the epithet is formally linked to the common soil fungus used in the biocontrol of fungal plant pathogens. The anamorph of Bionectria ochroleuca (Hypocreales) is morphologically indistinguishable from C. rosea; both morphs are redescribed. Bionectria is generically distinct from Nectria s. s. and is the appropriate genus for species of the Nectria ochroleuca group. The anamorph genus Gliocladium s. s. is associated with teleomorphs in Sphaerostilbella and Hypocrea series Pallidae. With the separation of Clonostachys from Gliocladium and Bionectria from Nectria the generic classification reflects natural relationships. A generic circumscription is proposed for Clonostachys and compared with Gliocladium. Nectriopsis sporangiicola and Roumegueriella rufula are related to Bionectria but have distinct Gliocladium-like anamorphs. Based on morphological features, Rhopalocladium myxophilum gen. et sp. nov. is proposed for the anamorph of N. sporangiicola. The anamorph of Roumegueriella rufula is generally found in association with the teleomorph and is referred to as Gliocladium-like.