Experiments with Spores of Aquatic Hyphomycetes: I. Sedimentation, and Impaction on Smooth Surfaces

Techniques are described for the production of heavy concentrationsof aquatic Hyphomycete spores, for estimating the spore concentration,the sedimentation rate of spores and their trapping efficiencyon smooth cylinders. No correlation could be discovered betweenthe rates of sedimentation and spore shape. Trapping experimentsshowed that the trapping efficiency of the tetraradiate sporeswas higher than that of spores of different shape. It is suggestedthat the higher efficiency might be the result of contact ofthe tetraradiate spore at three points on a surface.