plasomen.

1891 Jrnl. Royal Microsc. Soc. 207 Prof. J. Wiesner maintains that..the cell cannot be the ultimate elementary structure of the plant... For these living elements of the protoplasm which he formerly called plasmatosomes, the author now proposes the simpler term plasomes.

1895 New Sydenham Soc. Lexicon Plasome,..a term used by Brüche and Wiesner for hypothetical minute vital particles, made up of a group of protoplasmic molecules, and constituting the smallest units which can exhibit the primary vital [functions]. They correspond [to a certain extent] to Weismann's ‘biophors’, and to the ‘pangenes’ of de Vries.

1902 Encycl. Brit. XXXII. 41/1 In other cases the assumption of invisible protoplasmic units has been inspired by a desire..to explain the general vital and animative powers of protoplasm, as, for example, the ‘micellæ’ of Nägeli and the ‘plasomes’ of Wiesner.