666 
MUSCI. (MOSSES.) 
1. L. trictiomitrion, Mohr. Main stem creeping, leafless, 
throwing out pinnate branches; leaves when moist erect-spreading , ob¬ 
long-ovate, pointed, nerveless , the margins reflexed; perich. leaves 
very large, scarious, convolute, as long as the pedicel; capsule ovate- 
cylindrical. (Pterogonium trichomitrion, Hedw.) —Woods, in large 
spongy masses on the bark of trees, sometimes on rocks. 
2. JL. Ollioensc, Sulliv. Resembles No. 1, but a smaller plant; 
leaves more densely imbricated, when moist spreading horizontally, fur¬ 
nished with a strong nerve half their length. — Woods, Ohio. 
41. LEIJCODON) Schwaegr. Leucodon. 
Calyptra cuculliform, large, rather ventricose, plaited at the 
base. Capsule lateral, globose-ovate. Peristome double ; the ex¬ 
terior of 16 linear-oblong perforated teeth ; the interior, and the 
inflorescence, as in Pterogonium. Lid small, depressed-conic, 
short-beaked. (Name composed of \cvk6s, while , and 6ba>v, tooth.) 
1- Li. julaceus, Hedw. Main stem creeping, leafless; branch¬ 
es crowded , erect , simple, cylindrical; leaves densely imbricated, ovate, 
nerveless, spreading horizontally when moist; perich. leaves large, 
scarious, convolute, two thirds the length of the pedicel. — Woods, on 
the bark of trees, common westward, rare in mountainous districts. 
2. Li. brachypus, Brid. Distinguished from No. 1 by its 
longer and slenderer recurved branches , elongated and when moist 
only erect-spreading one-sided leaves , and much shorter pedicel , whence 
the specific name. (Fissidens sciuroides, Michx.) — Abundant on the 
Alleghany ranges, not affecting low lands like No. 1. 
Neckerace^. 
42. NECKtRA, Hedw. Neckera. 
Calyptra halved-mitriform. Capsule lateral. Peristome dou¬ 
ble ; the exterior of 16 linear teeth ; the interior 16 cilia arising 
from a very narrow membrane. Lid conic, more or less beaked. 
Inflorescence monoecious : sterile fl. gemmiform, axillary. (Nam¬ 
ed for Necker , a Gtr.nan botanist.) 
1. N. pcnnata, Hedw. Stems decumbent; the nearly pinnate 
branches flat; leaves 2- ranked , ovate-lanceolate, slightly wavy ; cap¬ 
sule ovate, erect, short-pedicelled, immersed in the large perich. 
leaves.—Trees, very common northward and along the Alleghany 
Mountains. A showy species, with broad and flat stems and branches. 
2. IV. filiformis, Hedw. Stems creeping , throwing out at 
right angles irregularly divided cylindrical branches ; leaves spreading , 
