500 
V. HEPAT1C/E. 
B. Leaves incubous. 
* Perianth free. Leaves without an injlexed basal lobule. 
+ Perianth lateral , or on very short lateral branchlets. 
13. Lepidozia. Leaves and stipules very minute, 4-cleft. Perianth 3-plicate ; month 
toothed. 
14. Mastigobryum. Leaves entire or 3-dentate. Perianth 3-gonous. 
15. Micropterygium. Leaves concave, 2-fid. Perianth long, membranous. 
ft Print terminal. 
16. Isotachys. Leaves and stipules nearly equal. Perianth tubular ; mouth contracted, 
toothed. 
** Perianth 0 or clothed with the adnate involucral leaves. 
+ Leaves without an injlexed basal lobule. 
17. Trichocolea. Leaves and stipules multifid ; segments hair-like. Perianth 0. 
18. Sendtnera. Leaves and stipules deeply cleft. Perianth with a many-cleft mouth. 
ft Leaves with an injlexed basal lobule. 
19. Polyotus. Leaves closely imbricate. Stipules often 4-fid. Perianth 0. 
*** Perianth free, lateral or axillary on the upper branches. Leaves with an infer ed or 
adnate basal lobule. 
t Lobule membranous, incurved or oppressed. 
20. Radula. Perianth terete or flat. Stipules 0. 
21. ill adotueca. Perianth compressed ; mouth contracted, 2-lipped. Stipules large. 
22. Lejeunia. Perianth various ; mouth contracted. Stipules entire or toothed, rarely 0. 
Leaves usually pale green. 
tt Lobule clavate, lunate, cylindric or half orbicular. 
23. Frullania. Perianth keeled. Leaves and stipules purple or black, rarely green. 
II. Frondose. — Plants with indistinct leaves, or consisting of a continuous scale- or 
leaf-like, simple or divided frond. (The 2 first genera are almost foliose.) 
A. Capsule solitary, globose or oblong, usually splitting into 4 valves (as in I. Foliose). 
Elaters with 2 or 3 spiral fibres. 
* Perianth perfect. 
t Frond pinnate or pinnatifid. Perianth with adnate involucral scales. 
24. Fossombronia. Perianth dorsal. Lobes of frond angular. 
25. Noterocj.ada. Periauth subterminal. Lobes of frond orbicular. 
ft Frond continuous, simpled, forked or divided. 
26. Petalophyllum. Frond crisped. Perianth rising from the midrib underneath, 
confluent with the perianth. 
27. Zoopsis. Frond minute, slender, of bladdery cells, the marginal with cilia. Pe- 
rianth lateral, large, pedicelled, laciniate. 
28. Podomitrion. Frond erect, stalked, oblong. Perianth dorsal from the midrib, 
tubular. 
29. Steetzia. Fronds linear, forked. Perianth subterniinal from the midrib, tubular ; 
mouth toothed. 
* # Perianth 0. 
30. Symphyogyna. Frond linear, midrib indistinct. Involucre a toothed scale, dorsal. 
31. Metzgeria. Frond linear; midrib distinct. Involucre a veutricose 2-lipped scale 
on the midrib beneath. 
32. Aneura. Frond linear, opaque, with no apparent midrib. Involucre cup-shaped, 
torn, marginal. 
