Microdochium stoveri and Monographella stoveri, new combinations for Fusarium stoveri and Micronectriella stoveri

Colonies derived from single ascospores of Micronectriella stoveri produced Fusarium stoveri in agar culture. The teleomorph had a paraphysate locule and an amyloid ascal apex, which places it in Monographella as M. stoveri (Booth) comb.nov. In the anamorph conidiogenesis was holoblastic, with conidiogenous cells either determinate or proliferating sympodially. Annellations were not seen either in optical or in scanning electron microscopy. The formation of annellations per se was rejected in defining genera. The anamorph of M. stoveri was found to be congeneric with anamorphs of other species of Monographella in which conidiogenesis is holoblastic-annellidic and which have been placed in Gerlachia. G. nivalis and the anamorph of M. stoveri were compared with Microdochium phragmitis, type species of Microdochium, and found to be congeneric. Gerlachia is considered to be a taxonomic synonym of Microdochium and the following new combinations were proposed: M. nivalis (Fries) comb.nov., M. nivalis var. majus (Wollenweber) comb.nov., M. oryzae (Hashioka & Yokogi) comb.nov. and M. stoveri (Booth) comb.nov.