Il(l>,ilinf i)f Xoiili Annrird. 1 1 1 



outer, ol)c()iiic, plii-itt', (•()iiii)resse(l, sliortly 4-lat'iiiiiiti' and den- 

 tate at its mouth, its narrow l)ase surrounded l)y lanceolate ser- 

 rate scales. 



ITaft— Near Philadelj)hia, Pa. {Dr. Watson). 

 Bib.— Syn. Hep. p. 0()1. 



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

 ing*; leaves uiie(|ually conduplicate-hilobed, the lobes ovate, 

 acute, serrate, the veJitral three times as large as the imbricate 

 dorsal lobes; inner involucre naked at the mouth. {Juiujer- 

 mania lonhrosa Schrad.) 



^a6.— White Mts,, N. H.; rare. (Eu.) 



Bib.— Syn. Hep. p. (59 ; Hep. Europ. p. 38. 



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



E.rsic. — Hep. Bor.-Amer. No. 15. 



XXX. PLAGIOCHILA Dumokt. 



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. pJmjios., sideways, 

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



* Ventral inarrjins of the hares decurrent and forminf/ 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-dentate 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. Jour. Sei. and Arts, 1846, p. 73. 



Kcsic— Muse AUegtian. No. 223; Hep. Bor-Amer. No. 11. 



