24 TJIiiwi^ Sfafc Lahoratori/ of NrtfinriJ TTlsfori^. 



Hob.—^orth America (Synopm Hepat. p. 600). (Eu.) Doubtfully 

 belonging to America. 



Bib.— Syn. Hepat. p. 600, Hep. Europ. p. 167. 

 Delin. — Lindenberg Monog. Ric t- XX. 



** Thalhifi naked on the margins, squrnnoiis underneath. 

 f Scales u'hitislt. 



7. R. Sorocarpa Biscli. Tlialhis 0.6 — 1.9 cm. in diam- 

 eter, pale green, or in the dry state or with age becoming albes- 

 cent, ^»f/// reticulate ahore, siibradiately or bifurcately divided; 

 divisions oblong-linear^ acutish, deeply and acutely sulcate 

 above, much thickened beneath and furnished toward the apex 

 with a few inconspicuous ivhite scales whicli do not extend beyond 

 the margin ; margins erect, when dry; spores issuing through 

 chinks which early appear along the groove above. 



Hab — Thin rocky soil and cultivated fields ; Closter, N. J. {Austin), 

 Western N.Y. {Clinton), 111. {Hall), Cal. {Bolander), S.C. {Ravenel). (Eu.) 

 Bib.— Syn. Hep. p. 600, Hep. Europ. p. 167. 

 Exsic. — Hep. Bor.-Amer. No. 139. 



8. R. lamellosa Raddi. Thallus pale green, elegantly 

 reticulated above, subradiately divided; divisions obovate or 

 obcordate, l)ilid or bilobed, 0.4 — 1.1 cm. long, canaliculate at 

 apex; margins membranous, ascending; furnished beneath with 

 tvhite., transverse^ subundulate scales ivhich extend considerably 

 beyond the margin; fruit as in R. Soi'ocarpa with which it is 

 usually associated. 



Hab.— Th'm rocky soil ; Closter, N.J. {Austin), Cal. {Bolander). (Eu.) 

 5*.— Syn. Hep. p. 605, Hep. Europ. p. 169. 

 DeZin.— Lindenberg Monog. Ric. t. XXX. 

 Exsic— Hep. Bor.-Amer. No. 140. 



ff Scales dark purple. 



9. R. nigrella D. C. Thallus dichotomously divided; 

 divisions linear, canaliculate, with entire, narrowly membran- 

 ous margins, green above, dark purple beneath and furnished 

 ivith transverse, semi-circular scales of the same color, which do 

 not exceed the margin. 



