Veg. Physiol. Pl. tagmata. [a. Gr. τάγμα something arranged, f. τάσσειν to set in order.] A term applied by Pfeffer (in German, 1877) to the aggregates of molecules of which the structure of a plant is supposed to consist.
1885. Goodale, Physiol. Bot., § 588. 213, note. Pfeffer applies a general term, Tagma, to all aggregates of molecules, thus bringing under one head the pleon, micella, and micellar aggregate; and he applies the name Syntagma to all bodies made up of tagmata.
1889. Burdon-Sanderson, in Nature, 26 Sept., 524. That an element of living material, is not equivalent to a molecule, however big or complex, but must rather be an arrangement or phalanx of molecules of different kinds. Hence the word tagma, first used by Pfeffer, has come to be accepted as best expressing the notion.
