stichidiumn.

/stɪˈkɪdɪəm/Etymology: modern Latin < Greek στίχος stichos n. + diminutive suffix -idium (= Greek -ιδιον).
Botany.
1855 J. Ogilvie
1857 A. Henfrey §337 Transformed branches containing imbedded tetraspores are called stichidia.
This entry has not yet been fully updated (first published 1916; most recently modified version published online December 2018).