SUMMARYFour isolates of Hyphochytrium catenoides Karling from soil or sand collected from widely scattered North American localities were compared in morphology and physiology. With the exception of discharge tube length, all isolates were morphologically alike. Isolates from Ontario, the Canadian high Arctic and Alaska grew at 10–30 C and in both alkaline and acid media. An isolate from Arizona grew at 20–35 C and grew well in alkaline but poorly in acid media. Out of 12 nitrogen sources tested all isolates grew best in yeast extract, peptone and asparagine, but they did not grow with inorganic nitrogen. Out of 18 carbohydrates tested as carbon sources all isolates utilized glucose, maltose, mannose, cellobiose, lactose, starch and cellulose, and grew poorly in galactose. The Ontario, Arctic and Alaska isolates also utilized glycerol. Differences between isolates were not considered sufficient to warrant any taxonomic separation.
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D. J. S. Barr (1970) studied this question.