108 Illinois State Laboratory of Natural History. 



2. S. glaucocephala Aust. Stems small, caespitose, 

 somewhat simple, creeping or ascending, producing numerous 

 suckers; leaves entire, obtusely complicate-bilobed, the lobes 

 broadly ovate, mostly obtuse and apiculate; involucral leaves 

 uniform, some of them somewhat denticulate; inner involucre 

 small, subcuneate, strongly compressed, the mouth truncate, 

 entire, often somewhat recurved. (S. Peckii Aust., Junger- 

 mania glaucocephala Tayl. ) 



Hob. On rotten wood, Canada (Macoun), N. Y. (Peck}, N. Eng. 

 (Austin). 



Bib. Syn. Hep. p. 684 (sub Jungermania) ; Pro. Phil. Acad. 1869, p. 

 218 ; Torrey Bull. VI, 85. 



Exsic. Hep. Bor.-Amer. No. 20. 



** Ventral lobes about double the size of the dorsal (except in 



upper leaves of No. 8). 

 f Margins of leaves subentire. 



3. S. albicans Mitt. var. taxifolia. Stems ascending, 

 almost rootless; leaves closely complicate-bifid, subdenticulate, 

 either wholly evittate or with only a rudimentary vitta near 

 the base, the lobes obtuse or somewhat acute, the ventral ob- 

 long-acinaciform, the dorsal subovate; inner involucre ovate- 

 plicate. (Jungermania albicans L. var. taxifolia, Diplophyllum 

 taxifolium Dumort. A smaller form is J. obtusifolia Sulliv. 

 Muse. Alleghan. No. 230, not of Hook.) 



Hob. Under rocks in mountain ravines, the smaller form also on 

 the ground. (Eu.) 



Bib. Syn. Hep p. 76 (sub Jungermania) ; Hep. Europ. p. 49 (sub 

 Diplophyllum} . 



Exsic. Muse. Alleghan. No. 229, 230 ; Hep. Bor.-Amer. No. 22, 23. 



4. S. compacta Dumort. var. irrigua. Stems creep- 

 ing; leaves repand, somewhat rigid, deeply unequally bilobed, 

 the lobes rounded, submucronate, the ventral appressed, the 

 dorsal half as large, convex, with incurved apex; involucral 

 leaves bifid, the lobes subequal. denticulate; inner involucre 

 ovate, subcompressed-angular, the mouth denticulate. (Jun- 

 germania irrigua Nees, S. irrigua Dumort. ) 



Hob In wet places, Mts. of N. Eng. (Oakes), Catskill Mts (Austin), 

 Canada (Macoun), near Tom's R, N. J. (Austin). (Eu.) 

 Bib. Syn. Hep. p. 67 ; Hep. Europ. p. 37. 

 Exsic. Hep. Bor.-Amer. No. 15c. 



ff Margins of leaves serrate-dentate. 



