Diversity of Culturable Bacteria Associated with Ascocarps of a Chinese White Truffle, Tuber panzhihuanense (Ascomycota)* Diversity of Culturable Bacteria Associated with Tuber panzhihuanensePinus armandii Ectomycorrhizosphere Soil Diversity of Culturable Bacteria Associated with Tuber panzhihuanensePinus armandii Ectomycorrhizosphere Soil Species Diversity of Cultivable Bacteria Isolated from the Roots of Cymbidium faberi Rolfe