SUMMARY. The colorless phytomonad, Polytomella caeca, has been grown in simple media with each of the following as the sole energy source: propionate, butyrate, valerate; butyl and amyl alcohols; DL‐glyceraldehyde, and alpha‐ketoglutaric acid. These compounds did not support growth in simple media: caproate, caprylic acid, isobutyrate, propyl, isopropyl and isobutyl alcohols. At present, C5, seems to be the limit of length of the fatty acids that are suitable carbon and energy sources. Iso compounds were not utilized. The pH in the acid media increased during incubation; that in alcohol media decreased.
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Donald L. Wise (1955) studied this question.
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