A re-evaluation of Melanospora Corda and similar genera is presented, based mainly on new data obtained by SEM examination of the ascospores. Eight genera are accepted: Melanospora (nine British species, including M. longisetosa P. Cannon & D. Hawksw.), Persiciospora P. Cannon & D. Hawksw. (including P. moreaui P. Cannon & D. Hawsksw. and P. masonii (Kirschst.) P. Cannon & D. Hawksw.), Phaeostoma (one species), Scopinella (four species; two in the British Isles), Sphaerodes (six species, including S. beatonii (D. Hawksw.) P. Cannon & D. Hawksw., 5. compressa (Udagawa & Cain) P. Cannon & D. Hawksw., S.fimicola (Hansen) P. Cannon & D. Hawksw., S. perplexa (D. Hawksw.) P. Cannon & D. Hawksw., S. retispora (Udagawa & Cain) P. Cannon & D. Hawksw., 5. retispora var. inferior (Udagawa & Cain) P. Cannon & D. Hawksw.; two in the British Isles), Sphaeronaemella (one species, not known in Britain), Syspastospora P. Cannon & D. Hawksw. (one species, S. parasitica (Tul.) P. Cannon & D. Hawksw.) and Viennotidea P. Cannon & D. Hawksw. (four species, including V.fmicola (Marchal) P. Cannon & D. Hawksw., V. humicola (Samson & W. Gams) P. Cannon & D. Hawksw., V. spermosphaerici (Malloch) P. Cannon & D. Hawksw., and V. raphani (Malloch) P. Cannon & D. Hawksw.; one in the British Isles).
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Cannon et al. (1982) studied this question.
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