Isolation and identification for strains from wild Phellinus and analysis on its secondary metabolites Isolation and Purification of Megasporocarp and Microsporangium in Azolla Electron Microscopic Observation of Symbiotic Relationship between Azolla and Anabaena During the Formation of Azolla Sporocarp UV Irradiation Increased the Content of Vitamin D2 in Agaricus bisporus sporocarp