An edible fungal polysaccharide termed as ABP was obtained by extraction with hot water, and followed successive chromatographic purification using DEAE-Sepharose Fast Flow column and Sephacryl S-300 High-Resolution column. A symmetrical peak was obtained on high-performance size-exclusion chromatography with an average molecular weight of 5.17 x 10(4) Da, which was named ABP, and its main components were d-glucose and d-mannose. Based on the study of methylation analysis, along with FT-IR, GC, GC-MS, 1D H-1 and C-13 NMR and 2D NMR (H-HCOSY, TOCSY, HMQC, and NOESY), its chemical structure was featured with a repeating unit (1 -> 6) linking beta-d-Glcp as the main backbone with (1 -> 4)-linked alpha-d-Manp units. The structure of the mainly repeating units of ABP was established as:-> 6)-beta-D-Glucp-(1 -> 4)-alpha-D-Manp(1 -> 6)-beta-D-Glucp-(1 -> 6)-beta-D-Glucp-(1 ->