Abstract
The viability of aquatic hyphomycete conidia trapped in foam was estimated with tetrazolium bromide. In fresh foam, 76 – 91% of all conidia had at least one viable cell; in old foam, these values were 20 – 43%. The average number of viable cells per conidium was higher in fresh than in old foam. Laboratory-produced conidia of Heliscus lugdunensis and Articulo-spora tetracladia had much higher numbers of viable cells than field-collected conidia. Viability as defined in this study (at least one viable cell per conidium) proved to be an excellent predictor of ability to germinate. Conidia of four species (two Canadian and two Indian strains) did not survive for more than 24 d when exposed to −17 °C, or to freeze – thaw cycles. Persistence of conidia through unfavourable conditions therefore seems limited. Key words: aquatic hyphomycetes, conidia, viability, germination.
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