26 Illinois State Lahoratori/ of Natiirdl Hlstori/. 



depressed-canaliculate above, convex and green or at length 

 purple beneath; margins usually purple, thickened, sub-ascend- 

 ing, hiysute-ciUate, with croivded, short, thick, obtuse, ichite, 

 spine-like hairs, obsolete in young states; fruit sparse, scattered 

 chiefly near the base of the divisions; spores about 0.071 — 0.083 

 mm. in diameter, dark brown, reticulate, not margined. 



Hab. — Cultivated fields and rocky ground ; N. J. to 111. and Fla. 

 5*.— Pro. Phil. Acad. 1869, p. 232. 

 Exsic. — Hep. Bor.-Amer. No. 143. 



1 2. R. Oalifornica Aust. MS. Divisions of thallus ex- 

 panded at apex, obcordate, cuneate, ciliate only at or toward 

 the apex or sometimes almost entirely naked on the margins: 

 spores as in B. Lescuriana which this species resembles. 



Hab.— Cal (Bolander). 

 Bib.— Torrey Bull. VI, p. 46. 



13. R. ciliata Hoffm. Thallus dichotomously or sub- 

 stellately divided; divisions linear or cuneate, obtuse, subemar- 

 ginate, subcanaliculate at the apex; cilia very long, slender and 

 fuscous, spores about as in B. Lescuriana. 



Hab.— With Fossombronia longiseta from Cal. (Bigeloio). (En.) 

 Bib.— Syn. Hep. p. 602, Hep. Europ. p. 168. 

 Dclin: — Lindenberg Monog. Ric. t. XXIII. 



14. R. intumescens Bisch. Thallus bifurcately lobed: 

 lobes very tumid, subcuneate-linear or subcuneate-oblong, deep- 

 ly and narrowly canaliculate, cinereous green, reticulate only 

 in the groove, which does not occupy more than \ of the ap- 

 parent upper surface, very dark piople (almost black) beneath^ 

 emitting rootlets only along the middle; the whole surface of 

 the thickened and strongly inflexed margins densely clothed with 

 long, appressed, tvhite, slender, sjnne-like hairs, which in the dry 

 state meet over the groove and entirely conceal it; spores brown, 

 very finely reticulated, not margined. ( R. tiiniida Lindenb. ) 



lfo?> —Rocky ground ; Ca}. [Bolander). (Eu.) 

 Bib.— Hyn. Hep. p. 603, Hep. Europ. p. 169. 

 Df/i/i.— Lindenberg Monog. Ric. t. XXVII. 

 E.rsic. — Hep. Bor.-Amer. No. 148 b. 



**** Thallus squamous beneath, squamous or squamous-ciliate 

 on tlie margin, witJi a distinct casta. 



