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The ultrastructure of specialized parenchyma cells which are believed to conduct an electrical stimulus as a membrane action potential is described for M. pudica. In general morphology these cells resemble “transfer cells” of leaves described by Gunning, Pate, and Briarty (1968) which are thought to playa role in the trans location of assimilates. An additional feature of the specialized parenchyma of M. pudica is the presence of an unusual type of plastid in which the grana lamellae may either display an “open” conformation, i.e. thylakoid membranes have moved apart, exhibiting electron-translucent areas between them, or a “closed” conformation, i.e. thylakoid membranes are stacked in an orthodox fashion. possible relation is suggested between the conformational changes of the plastids and the rapid transmission of stimuli.

Ultrastructure of Specialized Parenchyma Cells in the Leaf Blades of the Sensitive Plant Mimosa Pudica L