12 



Ml Ml llEPATICI. 



Transversa- 



Swarz. 



t'lyptuta. 

 Nobis. 



Uidentuta, 

 Linn. 



Trilobata. 



Web. 



:J SiTPULIS INTEGRIS. 

 V) 10. 1, CAULE Rlll'l'.NTE, SUBRAMOSO. FoLIIS IMBRt- 

 <A IIS, OBIIQUE OVATIS, OBTUSIS, BASI SUBTUS COM- 

 PLICATI8. STIPULIS RENIFORMI-SUBROTUNDIS, MAR- 

 pINE inflexis, ivi lgerrim is. v. r. * f WebCT, p. 

 34. Heine g. p. 16. &wart%. Fl. Ind. occid. p. 144. 

 Not Uncommon here, on tlie perpendicular walls of rocks — 

 rarer on trees. It is distinguished by a yellow color, feu 

 branches, often none, and its peculiar habit, of always grow- 

 ing transversely. The surculi arc from half an inch to 

 two inches long*, closely addressed. 



§11. I, CAULE REPENTE SUBPINNATO, MULTIS IMPLEX- 

 IS. FOLIIS IMBRICATIS, FORNICATIS, (iTA UT SUR- 

 CULI SEMICYLINDRACEI EVADUNl) DISTICHIS, OBLI- 

 QUE OVATIS, ROTUNDATIS, BASI SUBTUS COMPLICA- 

 TIS. Stipulis ORBICULATIS, MEDIO AFFIXIS QUASI 

 SCUTATIS. T. V. * ^ 



A very distinct species, growing downwards on trees 

 and rocks among and over other Jungermanniae in consi- 

 derable tufts. Color whitish yellow. The orbicular and 

 scutate stipulae distinguish it immediately. The single 

 surculi are not often more than half an inch long, but the 

 tufts frequently as large as the palm of the hand. The 

 fructification lateral. The stipules are elegantly imbricate 

 in one series. 



B. Divisis. 



1. Emarginato — bidentatis. 



§ 12. I, CAULE UECUMBENTE, APICE ADSCENDENTE SUB- 

 RAMOSO. FOLIIS BIDENTATIS, DENTIBUS ACUMINA- 

 TA. Stipulis ovatis quadrifidis. v. v. Coll. Eu- 

 rop. Weber, p. 40. Schwg. p. 18. JIuhl. Cat. n. 8. 

 Dr. Torrey sent it from New- York. Creeping on the 



earth frequently, at the root of trees, and rarely in tufts. 



2. tri-quadridenticulatis. 



13. I, Foliis oblique ovatis, retusis, APICE INAB- 

 qualiter tridentatis, caeterum ixtegerr1mis. 

 Stipulis bi-quadrifidis. Flagella ex axillis 

 stipularum. r. s. Cull. Ev.rop. from Pennsylvania 

 and Canada. Weber, p. 42. Schwg, p. 19. /. radi- 

 cans pi. Jlnlil. Cat. radicans, n. 11. 

 The Pennsylvania!! and Canadian specimens of this, 



agreeing in every respect with the European, prove thai 



