BIOLOGICAL OBSERVATIONS ON THE MARINE FUNGI OF WOODS HOLE WATERS

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Abstract
Biological observations on 15 species of phycomycetous fungi, 2 Myxomycetes and a Protomyxa-like protozoan are given. New proposals are EURYCHASMIDIUM (p.241), based on E. tumefaciens* (Chytridium t. Magnus) in Ceramium dia-phanum; Petersenia (Olpidiopsis) andreei* (Pleotra-chelus a. Lagerh.)(p.245) in Ectocarpus siliculosus; Pleol-pidium (Rozella) marinum* (p.256) on Chytridium poly-siphoniae; THRAUSTOCHYTRIUM (p.259), nearest Rhizophidium, with T. proliferum* (p.259) saprophytic on Bryopsis plumosa and Ceramium diaphanum. With one exception all the fungi were either parasites, facultative saprophytes, or saprophytes on various marine algae. One was found on rotifer eggs. The results of preliminary attempts to culture Sirolpidium bryopsidis, a facultative saprophyte of the green alga Bryopsis plumosa, are reported as partially successful. None of the fungi with perhaps the exception of Rhizophidium dis-cinctum has heretofore been known from the U. S. A. The existence of true marine fungi, their work as one of the several types of "reducers" in the sea, and their possible importance in the formation of marine humus are discussed.

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