Hepaticai of XorfJi AiHcyiva. 57 



IV. STEETZIA Lehm. 



Dioecious. Involucre at first terminal arising from the 

 midrib of the thallus, at length dorsal, cup-shaped, short-lacer- 

 ate. Inner involucre elongate, tubular, the mouth denticulate. 

 Calyptra equaling the perianth, irregularly torn at the apex. 

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

 drcecium dorsal on the midrib, covered with minute, fiml)riated, 

 perigonial leaves. Thallus with a distinct costa. (1)]l.t^:na 

 Dumort. ) Named for J. Sfeetz, 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. {Jioif/ennanid IjijcUli 

 Hook., J. sinnata et J. obloHf/a Schwein., Bhjffia LycUii Endl., 

 DipJolama LyeUil Dumort., DiJwna LiicJJii Dumort.) 



iTat.^Amoiig mosses in swamps, often aquatic ; common. (En.) 



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



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



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



V. METZGERIA lUmi. 



Dioecious. Involucre arising from the lower surface of the 

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

 cose and two-lol:>ed. Inner involucre wanting. Calyptra 

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

 ters unispiral, adherent to the ti})s of the valves. Antheridia 

 1-3, enclosed by a one-leaved involucre on the under side of the 

 midrib. Gemmae ovate, aggregated on the attenuate tips of 

 the linear thallus. Midrib distinct. Named for Si;/, (r/ordinn' 

 Metzger, an Italian botanist. 



1. M. pubescens Raddi. Dioecious: thallus 3 cm. long, 

 2 mm. wide, not very elongate, alternately ]>innate or somewhat 

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

 flat, 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 



