330 Herre 



tufted or pendulous, becoming enormously elongated ; 

 apothecia concolorous or pale tan, with fibrillose 



margin IV. Usnea^ 342. 



cc. Thallus not resembling hair. 

 f . Plants not gray or green. 

 g. Thallus brown or black. 



h. Sooty black, small, shrub-like, compact, sterile; on 



perpendicular sandstone rocks.. XIV. Ephebe^ 375* 



hh. Greenish black or brown, spreading, compressed; 



apothecia abundant, terminal ; on old fences, shrubs, 



and trees II. Cetraria^ 336- 



gg. Thallus yellow. 



i. Spores simple, colorless; thallus bright lemon-color; 



apothecia chestnut III. Ever?iia^ 341. 



a. Spores polar-bilocular, colorless; plants and apothecia 

 reddish yellow or orange. 

 j. Thallus lax, spreading, pendulous or decumbent; on 

 trees and maritime rocks ; apothecia scattered or 



marginal VI. Theloschistes^ 347* 



jj. Thallus short, rigid, becoming decumbent ; apothecia 

 terminal; on maritime rocks. 



XVII. Placodium, 3S3. 

 j^. Plants gray, green, or pale. 



k. Apothecia present. 



/. Apothecia concolorous ; thallus tufted, compressed or 

 terete, or elongate, pendulous, and greatly com- 

 pressed I. Ra7nalina^ 33 !• 



//. Apothecia not colored like thallus. 



in. Apothecia chestnut ; thallus lobes long, ascendant, 



white beneath ; on trees II. Cctraria, t^t^G. 



7)17)1. Apothecia yellowish, dusky, or red ; plants verj' 

 short, stout, erect, rigid, sub-crustaceous ; on 



maritime rocks XVIII. Leca)io7'a^ Z^A' 



kk. Apothecia absent. 



71. Thallus not pendulous or decumbent. 



o. Thallus erect, the narrow lobes margined with stout 

 branching fibrils ; on earth. .VIII. /V/_y.yc/a, 359. 

 00. Sub-crustaceous ; short, stout, terete, powdery ; 

 simple or branched ; on maritime rocks. 



XVIII. LecaTiora., 384. 

 nti. Thallus pendulous or erect; more or less white sore- 



diate ; on trees and shrubs III. Ever7iia^ 34^' 



