Hepaticce of North America. 87 



1. 0. ascendens Hook, and Wils. Large, pale-green; 

 stems prostrate; leaves ascending, roundish-oblong, slightly 

 emargiriate; involucral leaves 2-cleft; inner involucres 2-3- 

 lobed, the lobes long and irregularly lacerate-toothed. (C. la- 

 biatus Tayl.) 



Hob. On rotten logs, etc., rather common. 

 Bib Sulliv. Mosses U. S., p. 91. 

 Delin Sulliv. Mosses U. S., t. VIII. 

 Exsic. Hep. Bor.-Amer. No. 70. 



** 



Amphigastria bifid; involucral leaves 2. 



2. 0. pallescens Dumort. Stems procumbent, creeping; 

 leaves flattened, ovate-subquadrate, retuse or obtuse; amphi- 

 gastria ovate, distant, subentire, free; involucral leaves 2- 

 toothed; inner involucre deeply trifid, the laciniae spinose-den- 

 tate; calyptra conspicuous, mostly longer than the inner invo- 

 lucre. ( Jung ermania pallescens Ehrh.) 



Hob. Mts. of N. Eng. (Oakes). (Eu.) 

 Sib Syn. Hep. p. 187 ; Hep. Europ. p. 101. 

 Exsic. Hep. Bor.-Amer. No. 69. 



3. 0. polyanthos Corda. Stems procumbent, creeping; 

 leaves subascending, ovate-subquadrate, truncate-subretuse; 

 amphigastria free, distant, ovate-oblong; involucral leaves 

 slightly 2-toothed; inner involucre 3-lobed, the lobes short and 

 nearly entire; calyptra longer than the inner involucre. (Jun- 

 g ermania polyanthos L.) 



Var. rivularis Nees. Larger, more branching, succu- 

 lent; leaves mostly rounded at the apex; amphigastria often 

 divided into halves or entirely wanting, when present broader 

 and somewhat denticulate. 



Hob. On ground and rotten logs ; common. (Eu.) The variety in 

 shady rills. (Eu.) 



Bib Syn. Hep. p. 188; Hep. Europ. p. 101. 

 Delin Brit. Jung. t. 62 ; Ekart, t. VI, f . 50. 

 Exsic. Hep. Bor.-Amer. No. 67, 68. 



*** Amphigastria almost entire; involucral leaves 3-4. 



