238 CLADOKEA. 



membrane : but the evolution of the cup now precluded from the 

 first, and the podetia club-shaped. 



a. Flavo-virentes. Thallus especially developed and ample ; 

 from glaucous- becoming yellowish-green. Podetia cup-shaped 

 so far as known, but mostly infrequent, and ill- characterized 

 (n. 1-3). 



1. C. endivitffolia (Dicks.) Floerk. ; thallus prostrate ; Mi a- 

 ceous ; at length coriaceous ; the elongated, flexuous divisions 

 sinuately and somewhat pinnately cleft ; glaucous passing soon 

 into yellowish above ; sulphureous-white beneath ; podetia of 

 the colour of the thallus, short, smooth, turbinate, the cups 



irregular; apothecia reddish - brown. Fr. L. E. p. 212. 



Sclicer. Enum.p. 194. Nyl. Syn. \,p. 189. 



On dry sterile soils, especially of a calcareous nature, in the 

 Mediterranean countries ; as also in England, and even in the 

 Baltic island G-othland. I possess a specimen ticketed Carta- 

 gena by Gaudichaud ; but know not whether it be South Amer- 

 ican. A small specimen from Florida (Dr. Chapman) is possibly 

 however referable here. 



2. C. alcicornis (Lightf.) Floerk.; thallus ascendant; sub- 

 foliaceous ; cartilagineous, but thinner than the last ; the elon- 

 gated divisions narrow and linear, more or less palmately cleft, 

 and repand-dentate ; pale-green ; beneath creamy- white ; beset 

 here and there at the margins with tufts of blackening fibrils ; 

 podetia of the colour of the thallus; elongated -turbinate; 

 smooth ; the regular cups at length leafy, and proliferous ; apo- 

 thecia reddish-brown. Fr. L. E. p. 213. Schcer. Enum. p. 



194. Nyl. Syn. l,p. 190. 



Sterile, sandy earth. North America, Muhlenberg Catal. 

 1818; Floerke Clad. 1828. Arctic America, Hooker. Sands, 

 Cambridge, Mass., Tuckerman. Sterile fields, Weymouth, 

 Willey. 



3. C. ceratopliylla (Sw.) Eschw. ; thallus prostrate; sub- 

 foliaceous ; of much the size and aspect of the last but rather 

 thinner; the elongated, narrowed, deeply- and pinnately- cleft 

 divisions crisped-crenate at the margins ; pale- to yellowish- 

 green ; beneath white, sub-ciliate with finally blackening fibrils ; 

 podetia copiously arising from and characterizing the lobes, but 

 always sterile ; subulate ; simple for the most part ; as mostly 



