106 Illinois State Lahorafonj of Natural History. 



leaves erect, quadrate, usually 4-5-tootlied; inner involucre 

 erect, oblong, pale with a rosy band and spots, plicate above ^ 

 the mouth truncate, irregularly denticulate. 



Var. crispa Hook. Leaves quadrate-subrotund, closely 

 imbricate, deeply and obtusely emarginate-bi-trifid; involucral 

 leaves 3-4-cleft, subserrate, connate at base. (J. intermedia 

 Lindenb. ) 



Hah. — Sterile ground in open woods ; common. (Eu.) The var. in 

 rock crevices near the Passaic, Hudson and Delaware Rivers {Austin). 



Bib.— Syn. Hep. p. 112, 117; Hep. Europ. p. 76, 78. 



Delia.— Brit. Jung. t. 9; et Suppl. t. 2 var.; Ekart, t. IV, f. 29; et t. 

 VI et XII, f. 46. 



Exsic. — Hep. Bor.-Amer. No. 40, 41. 



26. J. incisa Schrad. Stems thick^ closely creeping or 

 ascending, radiculose; leaves densely crowded, somewhat quad- 

 rate, complicate, semivertical, 2-6-cleft, the laciniae unequal, 

 acute, more or less spinulose-dentate; involucral leaves similar, 

 more plicate and dentate, free; inner involucre short, oval or 

 obovate, the mouth plicate, denticulate. 



Hab. — On rotten wood in mountainous regions and northward. 

 (Eu.) 



Bib.— Syn. Hep. p. 118; Hep. Europ. p. 80. 



Delin.— Brit. Jung. t. 10 ; Ekart, t. IV, f. 59, et t. X, f. 77. 



Exsic. — Hep. Bor.-Amer. No. 42. 



27. J. Michauxii Web. Stems ascending, flexuous by 

 repeated innovations from beneath the summit; leaves subver- 

 tical, crowded, erect-spreading, somewhat saccate at the base, 

 subquadrate, bifid, the sinus narrow, the lobes acute not curved; 

 involucral leaves similar to those of the stem, the outer serru- 

 late, the inner smaller; inner involucre oval-subclavate, obtuse, 

 plicate at the apex, the mouth fringed. 



Hab. — On fallen trunks, etc. Mts. of N. Y. and N. Eng.; common. 

 (Eu.) 



Bib. -Syn. Hep. p. 119 ; Hep. Europ. p. 81. 



Exsic. — Muse. Alleghan. No. 236; Hep. Bor.-Amer. No. 43. 



28. J. Dicksoni Hook. Stems prostrate, copiously root- 

 ing beneath, somewhat sioiple, the apex ascending; leaves 

 spreading from a somewhat erect base^ somewhat involute 



