| Wolf's Bane (root) (Aconitum napellus).Predominating elements are derived from the more or less broken, large, rather thick-walled, essentially isodiametric closely united parenchyma cells filled with compound starch granules. A few slightly brownish, essentially rectangular only slightly elongated, rather thin-walled, very porous sclerenchyma cells, which generally occur singly, rarely in twos. Some porus ducts and tracheids; spiral ducts rare.
Starch granules singly, in twos, fours, and aggregates of from five to seven; hili distinct in the larger granules, centric; single granules 5μ to 15μ; cross bands quite distinct, broad, right angled. There should be no thick-walled sclerenchyma, no true bast, and vascular tissue should be sparingly present.
Source: Schneider, A. (1921) The Microanalysis of Powdered Vegetable Drugs, 2nd ed. [1]
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