I 2 
Evans. — Branching in the Leafy Hepaticae . 
branching axis which come after the incomplete leaf. The second and 
later leaves of the branch show a rapid progression in size. The modifica- 
tions just described are shown equally well by L. hidentata (see Leitgeb, 
’75, p. 24), another species with an exceedingly wide distribution, and are 
doubtless to be found in other members of the genus. 
Harpanthus . — The present genus is composed of two species, H. 
Flotowianus and H. scutatus , both of which are widely distributed in the 
Northern Hemisphere. According to the published descriptions the 
branching is invariably intercalary and ventral, and this statement is appa- 
rently true of H. scutatus. In robust forms of H. Flotowianus , however, 
branches of the Frullania type occasionally occur. The leaves of this 
Fig. 15 . Harpanthus Flotoivianus. Fig. 16. Plagiochila frondescens. East Maui, Hawaiian 
Riesengebirge, Bohemia (V. Schiffner, Islands (D. D. Baldwin, No. 85). x 17. 
in Hep. Eur. Exsic., No. 294 b). x 17. 
species are decurrent and spread obliquely. They are distinctly succubous 
and are attached by an almost longitudinal line. The apex is very shallowly 
indented, the apical lobes or teeth varying from rounded to pointed. The 
much smaller underleaves are lanceolate and acute, and are sometimes 
unidentate on one or both sides. When a terminal branch is developed 
it shows a coalescence with the branching axis very much as in Mastigo- 
phora Woodsii , the first underleaf being apparently situated at some little 
distance from the base of the branch (Fig. 15). The incomplete leaf 
occupies much the same position as in Lophocolea heterophylla ; it is nearly 
as large as the other leaves, but differs from them in being rounded and 
undivided at the apex. The first underleaf of the branch is considerably 
larger than normal underleaves and is deeply bifid with acute divisions. 
