Four polusaccharides were extracted with acetic acid from conidia of a pea brown spot-causing fungus, Mycosphaerella pinodes. Fraction II-I showed activity to induce accumulation of pisatin, a phytoalexin. Its molecular weight was about 45000, and it was composed of α-1, 2-linked mannose and α-1, 4- and α-1, 6-linked glucose. The sugar chains were branched with α-1, 4, 6-linkages and the non reducing terminal was glucose.
