Hepatico} of North Aiiio-iai. Ill 



outer, obconic, plicate, compressed, shortly 4-lacmiate and den- 

 tate at its mouth, its narrow base surrounded by lanceolate ser- 

 rate scales. 



Hab. — Near Philadelphia, Pa. {Dr. Watson). 

 Bib— Syn. Hep. p. 661. 



12. S. umbrosa Nees. Stems somewhat erect, branch- 

 ing; leaves unequally conduplicate-bilobed, the lobes ovate, 

 acute, serrate, the ventral three times as large as the imljricate 

 dorsal lobes; inner involuci'e naked at the mouth. {JiDiyer- 

 mania innbrosa Schrad.) 



Hab— White Mts,, N. H.; rare. (Eu.) 



Bib.— Syn. Hep. p. 69 ; Hep. P]urop. p. 38. 



Delin— Brit Jung. t. 24 et Suppl. t. 3 ; Ekart, t. II, f. 12. 



Exsic. — Hep. Bor.-Amer. No. 15. 



XXX. PLAGIOCHILA Dumoet. 



Fructification terminal or lateral. Inner involucre com- 

 pressed at right angles to the plane of the stem, the mouth 

 truncate, entire or ciliate-toothed. Involucral leaves 2, larger 

 than those of the stem. Calyptra membranous. Capsule oval. 

 Elaters inserted in the middle of the valves, long, bispiral, de- 

 ciduous. Antheridia covered by small ventricose imbricate 

 leaves. Leaves with the dorsal margin decurrent and deflexed, 

 often turned to one side. Name from Gr. plagios., sideways, 

 and cheilos, a lip, from the shape of the inner involucre. 



* Ventral inargins of the leaves decurrent and forniin;/ tiro par- 

 allel crestlike lines on under side of stem. 



1. P. Ludoviciana Sulliv. Main branches ascending, 

 flexuous, sparingly ramulose; leaves patent-divergent, semiovate, 

 2-3-deutate at the apex, the dorsal margins reflexed, entire, the 

 ventral spinulose-dentate; amphigastria deeply 2-3-cleft, the 

 segments ciliate-dentate. 



Hab. — On the bark of trees, La. and Ala. {SuUivant). 



Bib.— Syn. Hep. p. 660; Amer. .lour. Sci. and Arts, 1846, p. 73. 



Exsic. — Muse Allegnan. No. 223; Hep. Bor -Amer. No. 11. 



