INTERACTION BETWEEN TISSUE-CULTURED SEEDLINGS OF DENDROBIUM OFFICINALE AND MYCORRHIZAL FUNGUS (EPULORHIZA SP.) DURING SYMBIOTIC CULTURE In situ Symbiotic Seed Germination, Isolation and Identification of Effective Mycorrhizal Fungus in Paphiopedilum hirsutissimum (Orchidaceae) Interaction between Endophytic Fungi and Seedlings of Two Species of Paphiopedilum during Symbiotic Culture rDNA ITS Analysis of Mycorrhizal Fungi in Cymbidium Plants