Hepaticce of North America. 91 



. XXIII. LIOCHL.ENA NEES. 



Inner involucre terminal, ascending, retrorsely subarcuate, 

 at length cylindric, the vertex truncate, depressed plane, the 

 mouth contracted, ciliate, the cilia articulate, connivent in a 

 short cone. Involucral leaves 2, similar to those of the stem. 

 Capsule oval, 4-valved to the base. Elaters inserted in the 

 middle of the valves, bispiral. Antheridia in the axils of the 

 unchanged upper leaves, naked. Leaves entire. Amphigastria 

 wanting. Name from Gr. leios, smooth, and chlaina, a cloak 

 (inner involucre). 



1. L. lanceolata Nees. Stems closely creeping, branch- 

 ing; leaves entire, sometimes decurrent on the stem, the termi- 

 nal ones vertically contiguous. (Jungermania lanceolata L., 

 Aplozia lanceolata Dumort.) 



Hob. On banks and rotten logs in woods ; not rare. (Eu.) 

 Bib. Syn. Hep. p. 148; Hep. Europ. p. 58 (sub Aplozia). 

 Delin Brit. Jung. t. 28; Ekart 1. 1 f. 7. 

 JEmc. Hep. Bor.-Amer No. 62. 



XXIV. ODONTOSCHISMA DUMORT. 



Monoecious. Fructification terminal on a short branch, 

 arising from the ventral side of the stem. Inner involucre 

 ascending, terete, trigonal at the apex, the mouth denticulate. 

 Involucral leaves few, small, incised. Calyptra membranous. 

 Capsule oblong. Elaters placed at the middle of the valves, 

 caducous, bispiral. Antheridia in the axils of minute involu- 

 cral leaves of pendent branches. Amphigastria sometimes 

 wanting, except on gemmiferous branches. Gemmae collected 

 in heads upon the attenuated tips of the branches. (SPHAG- 

 NCECETIS Nees). Name from Gr. odos, odontos, tooth, and 

 schisma, a split, from the form of the inner involucre. 



1. O. sphagni Dumort. Stems creeping; leaves elliptic- 

 orbicular, entire, ascending; amphigastria wanting except on 

 fructiferous and gemmiferous stems, ovate, entire or bifid. 

 (Spliagnwcetis communis Nees, Jungermania spnagni Dicks.) 



