i 9 9 
Anacrogynous jungermanniales. 
with its forking or (more frequently) monopodial and pinnate 
branching, in the way of that differentiation into axis and leaves 
which has arisen repeatedly along independent lines among the 
lower Jungermanniales. 
Many of the species of Metzgeria are epiphytes, and among 
Fig. 30. Podomitrium (Hymenophytum) phyllanthus. —I, Part of a female 
plant from below, showing a female branch with ripe sporogonium ; II, Part 
of a male plant, from below, showing two antheridial branches; III, Trans¬ 
verse section of a male plant traversing an antheridial branch ; IV, Longitu¬ 
dinal section of an archegonial branch, after fertilisation, showing the 
developing perianth within the involucre ; V, Similar section showing the 
appearance of the perianth before fertilisation ; VI, Upper part of a longitu¬ 
dinal section through a ripe capsule, showing the apical thickening of the 
capsule-wall, c.s., conducting strand; inv., involucre; per. perianth. 
