石斛为兰科植物石斛Dendrobium nobileLindl.等植物的茎,是滋阴清热、生津止渴。的常用中药;近来,发现有将兰科植物石仙桃Pholidota chinensis Lindl·的根茎及假鳞茎作石斛入药。二者功效不同,所含的化学成分也不同,不能混用。为保证用药安全有效,避免品种混淆,现将两者的粉末显微特征和理化鉴别分述如下: Dendrobium is the stem of plants such as Dendrobium nobile Lindl. It is nourishing yin, clearing heat and thirst. The commonly used traditional Chinese medicine; Recently, it was discovered that the rhizomes and pseudo-bulbs of Pholidota chinensis Lindl. The effects of the two are different, and the chemical components contained in the two are also different and cannot be mixed. In order to ensure the safe and effective use of drugs and avoid confusion of varieties, the powder microscopic characteristics and physicochemical identification of the two are described as follows: