24 TJIinoiK State Lahoratori/ fff Natinril TTlstorif. 



Hah.— ^orth America ( Synopsis Hepuf. p. 600). (Eu.) Doubtfully, 

 belonging to America. 



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

 Delin. — Lindenberg Monog. Ric t- XX. 



** ThaJJHf> nal-ed on the margins, squamous underneath, 

 f Scales ivhitish. 



7. R. Sorocarpa Bisch. Thallus 0.6—1.9 cm. in diam- 

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

 cent, ^>^?/// reticulate above, subradiately or bifurcately divided; 

 divisions oblong-linear, acutish, deeply and acutely sulcate 

 above, much thickened beneath and furnished toward the apex 

 with a few inconspicuous white scales which 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.) 

 -B*.— Syn. Hep. p. 600, Hep. Europ. p. 167. 

 Exdc. — Hep. Bor.-Amer. No. 139. 



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

 reticulated above, subradiately divided; divisions obovate or 

 obcordate, bifid or bilobed, 0.4 — 1.1 cm. long, canaliculate at 

 apex; margins membranous, ascending; furnished beneath with 

 white, transverse, subundulate scales tvhich extend considerably 

 beyond the margin; fruit as in R. Sorocarpa with which it is 

 usually associated. 



Hab. — Thin rocky soil; Closter, N.J. (Austin), Cal. (Bolander). (Eu.) 

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

 Delin. — Lindenberg Monog. Hie. t. XXX. 

 Exsic. — Hep. Bor.-Amer. No. 140. 



ff Scales dark imrple. 



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. 



