ABsTRAcr Cora puvonka, a lichen haying a basidiomycetous mycobiont, is rich in protein (36%), of which 10% is tyrosine. a,o-Trehalose is present and was isolated in 4.4% yield. The lichen was found to contain polysaccharides typical of basidiomycetes and different from those of ascomycetes and ascomycetous lichens. Isolated and characterized were a /M@can and a heteropolysaccharide containing crhamnose, &ucose, D-xylase, D-manuose, ~-glucose, and ~galactose. The /3-Dghrcan was highly branched with 21% of nonreducing end-groups, contained 3-O-, 6-O-, and 3,6di-O-substituted B_D-glucopyranosyl units, and had a main chain consisting of (l-3)-and (1+6)-links. The heteropolysa&aride component contained mainly mannose and xylose, haying a mannosexontaining nucleus and a main chain with preponderant (1+3)-linked (r-D-mannopyranosyl residues. These were unsubstituted (lo%), and 4-O-(10%) and 2,4di-O-substituted (10%) with residues of ED-xylopyranose. On methylation analysis of the heteropolysaccharide, a capillary cohuun of DB-210 proved to be particularly useful for gas-liquid chromatographic resolution of partially O-methylated alditol acetates. JNTRODUCI'ION Cm puvoniu, known commonly in Brazil as "asa de papagaio" (parrot's wing), is one of only a few lichens haying a basidiomycetous rather than an ascomycetous mycosymbiont, and has never been subjected to a chemical analysis. In *NRC No. 24320.