PHYSIOLOGY OF AQUATIC FUNGI I

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Abstract
The optimal temperature range for cultivating Rhizophydium sphaerotheca was 25[degree] to 35[degree]C, whereas Phlyctochytrium punctatum thrived at 25[degree] and 30[degree] C. Limited growth of both organisms occurred under anaerobic conditions. R. sphaerotheca was particularly sensitive to inorganic phosphate in excess of 0.02 [image], and both chytrids grew well in media buffered in a pH range of from 5.9 to 7.3. They differed in their capacity to metabolize a number of organic compounds, however, both assimilated N in the form of inorganic salts. R. sphaerotheca required an exogenous supply of thiamine. The relevance of the findings to some of the current ideas concerned with the phylogeny of chytrids was discussed.