\ 
HEPATIC. (LIVERWORTS.) 89 
Suporper IV. JUNGERMANNIACE. Scare-Mosses. 
Either frondose or foliaceous: leaves when distinct 2-ranked, and often 
with a third row of smaller ones (amphigastria) on the under side of tk 
stem. Capsule on a cellular pedicel, dehiscent lengthwise into 4 valves. 
I. Vegetation frondose (stem and leaves confluent in a frond). 
13. METZGERIA, Raddi. (Tab. 21) 
Fertile fructification arising from the lower surface of the midrib of the frond. 
Involucre 1-leaved, scale-like, at length ventricose and 2-lobed. Perianth none. 
Calyptra ascending, oblong-obovate, rather fleshy. Capsule ovate. Elaters 
with one spiral fibre, adherent to the tip of the valves. Inflorescence dicecious : 
antheridia 1 -3, enclosed by a 1-leaved involucre on the under side of the mid- 
rib. te gemme aggregated on the attenuated tips of the linear frond; mid- 
rib distinct. (Named for J. Metzger, a German botanist 
1. Mi. furedata, Nees. Fronds linear, thin and membranaceous, forking 
or proliferous, with white pellucid hairs on the margins, and beneath on the 
midrib ; calyptra hispid. — Hilly districts, on rocks and the bark of trees. (Tab. 
21.)  (Eu.) 
2. M. pubéscens, Raddi. Larger than the last, pubescent on both 
surfaces. — Mountainous localities. (Eu 
14. ANEURA, Dumortier. (Tab. 21.) 
Fructification arising from the under side near the margin of the frond. In- 
volucre cup-shaped, very short and lacerate, or none. Perianth none. Calyp- 
ers 
rescence dicecious. Antheridia immersed in the upper surface of receptacles 
proceeding from the margin of t frond; which is fleshy and destitute of a 
midrib (whence the name, from a privative, and vedpov, a nerve). 
1. Ae Séssilis, Sprengel? Fronds irregularly lobed (1'-2! long, 3-5” 
wide) ; involucre none; calyptra papillose at the apex; pedicel 9” —12!' long, 
simple; involucre short and lacerate ; sterile receptac ‘ ° ° 
— Among Sphagnum, in the Southern States (Schweinitz) ; and in Ohio. Fruit 
not seen. (Eu.) 
3. A. palmata, N 
i ly divided, the divisions linear 
ing, palmately as eon 
ees, Fronds usually crowded (2”-3” high), ascend- 
and obtuse ; sometitnes prostrate and 
Rotten logs, &e.; common. (Eu.) 
creepinte 
