Hepaticce of North America. 83 



1. B. trilobata B. Gr. Stems creeping, dichotomous- 

 proliferous; leaves imbricate, obliquely ovate, antrorsely gib- 

 bous at the base, the apex rather broad, acutely tridentate, the 

 teeth entire; amphigastria subrotund-quadrangular, spreading^ 

 the upper margin 4-6-toothed, the teeth subdenticulate ; inner 

 involucre curved, cylindric, plicate at the narrow apex, the 

 mouth tridentate. (Jungermania trilobata L., Pleuroschisma 

 trilobatum Dumort., Mastigdbryum trilobatum Nees). A variety 

 is Mastigobryum tridenticulatum Lindenb., (Jungermania tri- 

 denticulata Michx.) 



Hab. In ravines, wet woods and swamps ; common northward and 

 on the mountains. The variety from N. J. southward. (Eu.) 



Bib. Syn. Hep. p. 230 ; Hep. Europ. p. 103. 



Delin. Brit. Jung. t. 76 ; Ekart, t. Ill, f. 22 ; Sulliv. Mosses U. S., t. 

 VIII. 



Exsic. Hep. Bor.-Amer. No. 77, 78, 79. 



2. B. deflexa B. Gr. Stems narrow, forked or -alter- 

 nately branching; leaves strongly deflexed, cordate-ovate or 

 ovate-oblong, falcate, arcuate at the dorsal margin, bi-triden- 

 tate or entire at the narrow apex; amphigastria somewhat 

 approximate, suborbicular-quadrate, the upper margin bifid, 

 crenate or entire; inner involucre cylindric, arcuate, plicate at 

 the apex, the mouth denticulate. (Jungermania deflexa, Mart., 

 Pleuroschisma defl-exum Dumort., Mastigobryum deflexum Nees. 

 Includes Mastigobryum ambiguum Lindenb., and M. denuda- 

 tumTorrej MS.) 



Hob. On rocks in the higher mountains. (Eu.) 

 Bib Syn. Hep. p. 231 ; Hep. Europ. p. 104. 

 Delin Ekart, t. XII, f. 98. 

 Exsic. Hep. Bor.-Amer. No. 80. 



XVII. LEPIDOZIA NEES. 



Sporogonium terminal on short branches arising from the 

 under side of the stem. Inner involucre elongate, obtusely 3- 

 plaited, the mouth denticulate. Involucral leaves small, rather 

 broad, acutely 2-4-lobed at the apex. Calyptra membranous, 

 slender, included. Capsule globose, 4-valved at the base. Ela- 

 ters bispiral. Antheridia on short, spike-like branches, arising 



