Ih'ptiliaf of Xortli Aiiirricii. -IT 



I\-. STEETZIA Lkiim. 



Did'cious. Involucre at first terminal urisin<^ from the 

 mi(lril) of the thallus, at leno-th dorsal, ciip-shaped, short-lacer- 

 ate. Tuner involucre elonojate, tubular, the mouth denticulate. 

 Calyptra equaling the perianth, irregularly torn at the apex. 

 Capsnle oval, 4-valved. Elaters filiform, free, bispiral. An- 

 drcBcium dorsal on the midrib, covered with minute, fimbriated, 

 perigonial leaves. Thallus with a distinct costa. (Dil.*;na 

 Dumort. ) Named for ./. Sfcefz, a German botanist. 



1. S. Lyellii Lehm. Thallus 2.5— 10 cm. long, 0.0— 1 

 cm. wide, simple or two-cleft, delicate, the margin entire, 

 slightly crenate or obscurely serrate. (Junger)natil(( Lijcllii 

 Hook., J. s/tmafa et J. obhnga Schwein., Bli/ffia Li/fUli Endl.. 

 I)}j)l()J(i')Ui LyeUii Dumort., I)U(vn<i Li/cllii Dumort.) 



Hnb. — Among mosses in swamps, often aquatic ; common. (En.) 



Bib. — Syn. Hep. p. 785; Hep. Europ. p. 137. 



Delin— Brit. Jung. t. 77 ; Ekart t. X f. 87 ; Sulliv. Mosses U. 8. t. VI. 



Rrsic— Muse. Alleghan. No. 281 ; Hep. Bor.-Amer. No. 109. 



Y. METZGERIA Raddt. 



Dicecious. Involucre arising from the lower surface of the 

 midrib of the thallus, one leaved, scale-like, at length ventri- 

 cose and two-lobed. Inner involucre wanting. Calyptra 

 ascending, oblong-ovate, rather fleshy. Capsule ovate. Ela- 

 ters unispiral, adherent to the tips of the valves. Antheridia 

 1-8, enclosed by a one-leaved involucre on the nnder side of the 

 midrib. Gemmae ovate, aggregated on the attenuate ti])s of 

 the linear thallus. Midrilj distinct. Named for S/(/. (iionniiii 

 Mff<(/er, an Italian botanist. 



1. M. pubescens Raddi. Dicecious: thallus 3 cm. long. 

 2 mm. wide, not very elongate, alternately pinnate or somewhat 

 decompound, the branches short, linear and of uniform width, 

 Hat. undulate on the margins, everywhere, above and below, 

 uniformly and densely villose: the hairs beneath longer, all 

 single, or many at the margin double or in threes, nodding, and 



