Hepaticce of North Anicrtnt. ' 23 



neath; divisions narrow, dichotomous, plane or when dry 

 broadly canaliculate above, convex-thickened beneath; lobes 

 nearly linear, very obtuse, narrowly emarginate and somewhat 

 thickened at the apex; rootlets smooth within; antheridia 

 large, immersed, causing the under surface to appear nodulose. 

 Possibly only the male plant of No. 1. 



Hab.Nev. (Watson), Col. (Wolfe). 

 Bib.Torrey Bull. VI, p. 17. 



3. R. glauca L. Thallus orbicular, somewhat stellately 

 lobed, 1.3 2.5 cm. in diameter; divisions linear-obovate or 

 linear-obcordate, emarginate-lobed, channeled only toward the 

 apex, beautifully reticulate and glaucous above, membranous 

 along the margin, greenish beneath; spores 0.084 mm. in diam- 

 eter, moderately reticulate and with a narrow pellucid margin. 



Hob Cal. (Bolander). (Eu.) 



Bib. Syn. Hep. p. 599, Hep. Europ. p. 167. 



Delin. Lindenberg Monog. Ric. t. XIX. 



4. R. albida Sulliv. in Herb. 1853. Thallus small, cov- 

 ered with a thick, spongy, deeply-pitted, milk-white epidermis, 

 alternately or bifurcately divided; divisions oblong, much 

 crowded, with a rounded sub-marginate apex, narrowly and 

 deeply canaliculate above, densely radiculose and subsquamous 

 beneath; fruit unknown. 



Hob Tex. (Wright). 



Bib. Pro. Phil. Acad. 1869, p. 231. 



5. R. Beyrichiana Hampe, MS. Thallus fleshy, caespi- 

 tose, adhering to the earth by long hyaline rootlets, sensibly 

 dilated from a narrow linear base, mostly bifid ^ the length, 

 narrowly channeled and green above, the margins entire, as- 

 cending. Clothed with a dark-purple membrane beneath. 



Hob." Between Jefferson and Gainsville, Tenn." (Beyrich). 

 Bib.- -$yn. Hep. p. 601. 



6. R. bifurca Hoffm. Thallus dichotomously or sub- 

 stellately divided, pale green ; divisions wedge-shaped, 2-lobed 

 at the apex; lobes spreading, dotted, broadly channeled above 

 by the thick and ascending margins, purplish beneath. 



