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A PRELIMINARY STUDY ON THE ATPase BY HISTOCHEMISTRY AND SEM OF MICROSPOGENESIS IN SWEET PEPPER INFLUENCED BY POTASSIUM FERRICYANIDE UNDER TISSUE CULTURAL CONDITION Morphology and taxonomy of leaf papillae and mammillae in Pottiaceae of China STUDIES ON THE SPORE MORPHOLOGY OF ALEURITOPTERIS FEE IN BEIJING STUDIES ON THE SPORE MORPHOLOGY OF ADIANTUM L.IN BEIJING