104 Illinois State Laboratory of Natural History. 



19. J. Wallrothiana Nees. Blackish, very minute; 

 stems creeping, subsimple or innovate-branching, 1.2 mm. 

 long, strongly radiculose ; leaves wider than the stem, clasping, 

 firm, ovate-quadrate, closely imbricate, semivertical, concave, 

 connivent upwards, emarginate-bidentate, the sinus obtuse in 

 the lower, acute in the upper leaves, the teeth obtuse, entire; 

 involucral leaves larger, erect, tridentate, wavy-plicate, connate 

 at the base; inner involucre oval-cylindric, contracted above, 

 plicate, the mouth subdentate, pellucid, reddish below. ((>yin- 

 nocolea affinis Dumort. var. B.) 



Hob. On coarse sand, slopes of White Mts., N. H. (Odkt.x). (Eu.) 

 Bib. Syn. Hep. p. 104; Hep. Europ. p. 66. 



f Leaves bifid or bilobed. 

 J Involucral leaves cleft or lobed. 



20. J. Helleriana Nees. Stems creeping, intricate; leaves 

 complicate-concave, spreading, subascending, bifid ^ J their 

 length, the lobes equal, acute, entire or serrate; involucral 

 leaves bi-trifid, spinulose-serrate ; inner involucre ovate, the 

 mouth contracted. (Diplophyllum Hellerianum Dumort.^ 



Hah. On rotten wood; Can., N. Y., N. Eng.; rare. (Eu.) 

 Bib. Syn. Hep. p. 120 ; Hep. Europ. p. 50. 

 Delin. Ekart t. XII, f. 103. 

 Exsic. Hep. Bor.-Amer. No. 44. 



21. J. minuta Crantz. Stems rootless; leaves compli- 

 cate-concave, spreading, bifid J J their length, the lobes some- 

 what equal, ovate, acute or obtuse, entire or the gemmiferous 

 somewhat dentate; involucral leaves trifid; inner involucre 

 oval-oblong or subcylindric. ( Diplophyllum minut urn Dumort.) 



Hob. On rocks in high mountain regions and northward to Green- 

 land (Vahl). (Eu.) 



Bib. Syn. Hep. p. 120; Hep. Europ. p. 49. 

 Delin. Brit. Jung. t. 44: Ekart, t. I, f. 3. 

 Exsic. Hep. Bor.-Amer. No. 45. 



22. J. polita Nees. Stems subsimple, flexuous, blackish, 

 ascending; leaves shining, vertical, broadly clasping, flexuous 

 spreading, broadly cuneate-quadrate, 2-3-lobed, the margin ob- 

 tusely undulate-plicate; involucral leaves 2, very broad and 



