The sporelings of Lejeunea caespitosa Lindenb.

Abstract

Sporelings of Lejeunea caespitosa Lindenb. usually form a primary protonema of a single row of four cells, and a secondary protonema at first of two rows, and eventually of four rows of cells. The juvenile stem with two dorsal and three ventral rows of cells produces simple undivided underleaves and elobulate primary leaves or, later, lobulate juvenile leaves of which well developed lobules nearly equal the lobes in size. Bifid underleaves are formed as soon as the stem acquires four ventral rows of cells.