JUNGERMANNIACEAE 83 
anth,” which, in many cases, at least, represents a union of the ' 
leaves of theadjacent cycle. The leaves (4% bracts ") and under- 
leaf (“ bracteole ") subtending the perianth often somewhat modified. 
Capsule quadrivalvate (the valves very рът sa cleft). 
Elaters always developed in association with the s 
More than four fifths of all the species of esas of the 
world, according to Schiffner, belong to the present family. 
Key to the Genera of Jungermanniaceae.* 
Underleaves present throughou 
Leaves complicate- bilebed, the ventral lobe much the smaller. 
entral lobe usually inflated, sac-like, helmet-shaped, or obovoid. clavate, 
rarely explanate ; underleaves bifid, 35. 
Ventral lobe plane or with падна, margins, ovate to linear- 22. some- 
times nearly separate from the dorsal ; underleaves entire or den 
34. века а 
Leaves with 2-5 lobes ог = or divided to Ше base into capillary segments, 
never acutely я 
Leaves bifid or biden 
Underleaves iu dia than the leaves and usually different in form. 
© branch a fleshy almost Декен subterranean sac depending from 
the ventral surface of th ; the appressed underleaves bifid to 
the middle or below, как rs narrow sinus and amid Leges 
lobes, otherwise éntire 25. Сеос 
9 stem or branch comparatively pes modified, е ае реа. 
Root-hairs in tu e of the underleaves, the latter 
deeply bifid, the eu spreading segments again cleft or 
more or less 
triangular-prismatic, the third = always dorsa 
22. pees 
` Root-hairs irregularly scattered; TOES triangular-prismatic, at 
least when young, the third angle always ventral. 
26 petimus T 
Root-hairs irregularly scattered ; perianth ovoid, obovoi 3 
cylindrical, sometimes slightly compressed uaa termina 
on main stem or leading branches, now an falsely 
dorsal; I. Lophosia. 
Underleaves similar to the leaves both in form and size 
30, Anthelia. 
Leaves with 3-5 principal lobes or teeth, these more than one cell wide at 
base 
Leaves 3- or 4-lobed to about the middle (in our ard than the 
entire, somewhat acute, incurved ; underleaves a little sma e e 
leaves, otherwise similar; perianth on short — етеу E 
ах! of ап underlea a. 
* The present key is based, for the most part, upon the — Californian repre- 
Sentatives of the various genera, and may not always apply to extra- €: na 
Underleaves are rather uncommon in this genus outside of the 9 branches, 
they are always represented. 
е 
