Anatomy of the Aerial Axes of Equisetum kansanum

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Abstract
The endodermis of the aerial stems of this species is more developed than in any Equisetum of which the anatomy has been studied. Outer and inner endodermes are in contact, the former being invaginated round the outer part of the bundles and both being in places more than one cell thick, so that in a transverse section of the axis there seem to be common inner and outer and special endodermes. The torn remains, chiefly walls, of the cells destroyed by the formation of the central cavity adhere to the edge of the cells forming the boundary of the latter. It is held that the layers of very delicate cells described by Milde as delimiting the central cavity in 4 species of Equisetum are really such crushed remains of cells that have perished. Anatomically, the species comes closest to E. trachyodon.

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