62 Illiiiuis State Lahoratonj of Xattiral Historij. 



2. F. saxicola Aust. Stems closely crdeping, numerous 

 iind widely bninching; leaves orbicular, scarcely oblique, plane, 

 the auricles approximating the stem, small, rarely larger, and 

 then rotund-galeate; amphigastria scarcely wider than the 

 stem, subovate, bifid; inner involucre broadly oblong, the 

 mouth very short, bowl-shaped, papillose, beneath abruptly and 

 broadly carinate, 1-many nerved on both sides the carina, 2-an- 



gular. 



^«6.— "On inclined surface of dry trap rocks, Closter, N. J." 

 {Austin), Tex. ( Wright). 



Bib.— Yro. Phil. Acad. 1869, p. 225. 



Exsic. — Hep. Bor.-Amer. Nos. 104. 



b. Aurides ahont tliree-foiirtlis the .i/ze of tJie leaves. 



3. F. Oakesiana Aust. Stems widely branching, the 

 fertile branches short, sub-erect; leaves somewhat obliquely 

 orbicular, loosely imbricate; sub-convex, the margins slightly 

 repand, the auricles almost equaling the leaves, rotund, nearly 

 contiguous to the stem; amphigastria ovate-rotund or sub-obo- 

 vate, little wider than the stem, bifid, entire or subserrulate; 

 inner involucre small, subobovate-pyriform, somewhat inflated, 

 broadly carinate beneath, smooth or 1-7-nerved or alate on both 

 sides; involucral leaves bilobed, entire, more or less connate, 

 the lobes equal, obtuse, parallel. 



Hah. — On bark of stunted spruce and birch trees; White Mts. 

 ( Oakes, Austin). 



Bib.— Fro. Phil. Acad. 1869, p. 226. 

 -E.csic— Hep. Bor.-Amer. No. 105c. 



4. F. Sullivantii Aust. Stems closely appressed, short 

 branching; leaves subrotund, convex, entire, obtuse, the auricle 

 large, galeate-rotund, equaling f the width of the leaf, approx- 

 imate to the stem; amphigastria obovate, obtusely bifid, suben- 

 tire, scarcely wider than the stem, those toward the fructifica- 

 tion oblong or cuneate, the lobes obtuse or the uppermost 

 acute; inner involucre obovate, subcompressed, short-beaked, 

 dorsally 1-2-nerved, ventrally unicarinate, the carina 2-angled 

 or 2-winged; involucral leaves rotund, connate with the inner 

 involucre, and one or the other with the amphigastria. 



ITab.— On the bark of trees; Ga. {Sullivant), S. C. (Curtiss). 

 Bib.— Tro. Phil. Acad. 1869, p. 226. 



tj A tooth on the iiHirg/n of the inrolncral leaves above the 

 middle of the lower lobe. 



