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Using an affinity adsorbent prepared from L-fucose and starch, a lectin was isolated from fruit bodies of an ascomycete mushroom, Melastiza chateri. The lectin was found to cross-react with antiserum against Aleuria aurantia lectin (AAL), that had been obtained from another ascomycete mushroom. The N-terminal amino acid sequence was analyzed, and among 20 residues 12 were the same as AAL. The molecular mass of the lectin estimated by SDS-PAGE was approximately 40kDa, which is larger than that of AAL. Mycelial isolate was obtained from M. chateri by germinating ascospores, and identified by analyzing restriction fragment length polymorphisms (RFLP) of DNA. The isolate from M. chateri did not synthesize the lectin, although the isolate from A. aurantia had been known to synthesize AAL as much as the fruit body.