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A glucomannan has been extracted from urediospores of mixed races of Puccinia greininis tritici with alkali and shown to be composed of equal numbers of D-glUCOSe and D-mannose residues. Methylation and periodate oxidation studies have denionstrated that the average repeating unit of the glucomannan consists of approximately 6 terminal non-reducing residues, (3 of D-glucose and 3 of D-mannose), 104 non-terminal D-mannose residues (52 residues linked through CI and CC and 52 through CI and C, ) and 4 branching residues probably consisting of D-glucose units joined through CI, Cn and C! . The glycosidic linkages are of the 0-D-type. An aqueous extract of the urediospores is shown to contain glycerol, D-arabitol and D-mannitol.(1) Paper No. 3920, Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul, Minn. Extracted from a thesis submitted by N. Prentice to the University of Minnesota in partial fulfillment for the degree of

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