The trapping of aquatic hyphomycete spores by air bubbles

A technique is described for estimating the rate of removal of aquatic hyphomycete spores from suspension by air bubbles, and for calculating the trapping efficiency of an air bubble. Values for trapping efficiency are given for different kinds of hyphomycete spore. In general, the branched type of spore is more readily removed from suspension than spores of conventional shape, although the trapping of the sigmoid spores of Anguillospora crassa is quite effective. Evidence is presented for Varicosporium elodeae that as the complexity of branching of the spore increases, the effectiveness of trapping by air bubbles also increases. The addition of detergent causes an increase in the rate of removal of spores.

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