Multiplex conidium morphology in species of the Ulocladium atrum group
Keyword(s):
Cultures of many isolates of Ulocladium Preuss mature with conidium populations dominated by dark, obovoid to spherical, densely ornamented spores similar to those of typical Ulocladium atrum Preuss. Early-growth conidia of such isolates frequently are quite different morphologically from those of U. atrum and are considered to be useful in defining species within a U. atrum species group. Four species are compared from this viewpoint in both early-growth and late-growth stages: U. atrum, Ulocladium cucurbitae (Letendre & Roumeguère) Simmons, Ulocladium multiforme Simmons sp.nov. (from soil), and Ulocladium dauci Simmons sp.nov. (from seed of Daucus carota L.).Key words: Ulocladium, classification, conidium variability.