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真天麻呈椭园形,略扁,皱缩而弯曲,表面黄白色或淡棕色,半透明,大的两端钝园,小的下端尖,上端有时有干枯残茎或红色的芽,俗等“鹦哥嘴”,下端有凹陷的根痕,呈园盘状。全体多纵沟,有由点状的须根痕组成的横环纹。质坚实而紧密,光润半透明。不易折断,断面角质形状,味甘微辛。伪品有以下几种:1、凡表面带白粉霜,下端有纤维,头部带纤维,为大理菊根伪造的天麻。2、尾端切过,不透明,头茎中空,有两排须根洞,断面有环园形,为胭脂花根伪造天麻。3、顶端有茎痕和芽苞,表面较光滑,皱纹较浅。有点状须根痕排列成环,尾端无园形的疤痕,质坚实可刮下细屑,断面无光泽,味淡,为马铃薯伪造天麻。
True Gastrodia ellipse-shaped, slightly flat, wrinkled and curved, yellow-white or light brown surface, translucent, large garden with two ends blunt, small lower tip, sometimes with dry stem or red buds, etc. “Butterfly’s mouth,” has a concave root mark at the lower end. There are many vertical grooves in the whole, and there is a horizontal ring pattern consisting of dotted fibrous root marks. Solid and compact, smooth and translucent. Not easily broken, cross-section horny shape, sweet and slightly pungent. Counterfeit goods are the following: 1, where the surface with a white powder cream, the bottom of the fiber, head with fiber, for the Dali Jugengeng gastrodin. 2, cut end, opaque, head stem hollow, there are two rows of root hole, cross-shaped circle-shaped, for the rouge flower root forgery. 3, the top has stem marks and buds, the surface is smooth, wrinkles shallow. A bit like to be arranged in the form of a ring, no end of the end of the scar, the quality of solid scrape can be fine, cross-section dull, tasteless, for the artificial gastrodin Gastrodia.