MARSUPELLA 85 
Perianth not compressed dorso-ventrally, deeply plicate at mouth; leaf 
folded at about a right angle, the fold rounded ; lobes acuminate, ob- 
scurely crenulate toward apex ; root-hairs long and numerous. 
21. Lophozia (Г. ovata). 
Leaves with two nearly equal lobes or teeth, never acutely complicate. 
Archegonia terminal on the main stem; uppermost pair of 9 bracts more or 
less highly connate, enclosing the delicate perianth, to the lower part of 
which the bracts are adnate ; leaves typically transverse. 
17. Marsupella. 
Archegonia usually terminal on short, ventral branches; perianth free from 
the bracts, much exserted, triangular-prismatic, at least when young, the 
third angle always ventral; branches, typically, all of ventral origin 
26. 
from each other and from the perianth ; perianth oval to cylindrical-obovoid, 
never triangular-prismatic, commonly plicate toward the mouth ; leaves suc- 
cubous. 
ubo › 
Leaves with 3-5 lobes. 21. Горлова 
Leaves entire (or in Plagiochila often dentate-margined), never bilobed 
Plants with creeping, nearly or quite leafless, rhizomatous primary stems and 
ascending foliose branches ; leaf-margins usually somewhat dentate. 
Plagiochila У 
22. 
Plants without rhizomatous primary stems; leaf-margins entire or merely 
repand. 
9 bracts more or less adnate to base of perianth. 19. Майа. 
Ф bracts wholly free from perianth. 20, Jungermannia. 
17. MARSUPELLA Dumort. p.p. Comm, Bot. 114. 1822. 
Sarcoscyphos Corda ; Opiz, Beitr. 652. 1829.1 
Nardius 5, Е. Gray, pro parte minima, Nat. Arr. Brit. рї: 
094. 1821. : 
Plants from large and stout to very small and slender, usually 
densely caespitose. Stems erect or ascending, very rarely pros- 
trate, subsimple or dichotomously branched, commonly E out 
stolons or nearly leafless flagella from near the base, gE ge in 
most species infrequent except at base and on the stolons. sabe 
Patent or erécto-patent, always bilobed ; in the typical spe 
Pressed dorso-ventrally ; in M. Bolanderi often obliquely inserted 
and distinctly succubous. Underleaves wanti 
ог paroicous, rarely autoicous or synoicous. © bracts commonly 
resent in the North American 
* Structures representing underleaves are commonly p 
g underleave ; да p 
Plagiochilae but they are often so minute and fugacious that they may someti ы 
bservation, 
T See footnote, Р. 33. 
