A heteropolysaccharide and aβ-D-glucan were isolated from a lichen, Gyrophora esculenta Miyoshi (Iwatake), by cold water and alkali extractions, respectively. The chemical properties of purified polysaccharides were examined by acid hydrolysis, methylation, and GC-MS. The heteropolysaccharide is a highly branched galactomannan-type polysaccharide, containing anα-(1→6)-linked D-mannan backbone, and the glucan is a linear (1→6)-β-D-glucan. With regard to the antitumor activity, both the galactomannan and (1→6)-β-D-glucan had moderate inhibition activities on Sarcoma 180, but lower than those of branched (1→3)-β-D-glucans.

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