146 COLLBMA. 



(Willey), Tuckerman Gen. 1872. Also on Eed Cedar at Cam- 

 bridge. On the same bark in New Jersey, Austin. 



Like the somewhat similar C. microphyllum, this lichen, 

 which, as represented in Schaerer's excellent specimens (Lich. 

 Helv. n. 416), corresponds with the definition of Acharius (<7. 

 furvum v. verruciforme, Ach. Syn. p. 323) in exhibiting dense, 

 rounded, little cushions, which gave occasion to its name, passes, 

 at least here, into an effuse and scurfy form, not otherwise dif- 

 fering. And this ends finally in an almost granulose and crus- 

 taceous one, from which C. quadratum, Lahm (Koerb. Parerg. 

 p. 411), appears to be scarcely separable. C. callibotrys, with its 

 well-developed, foliaceous thallus, offers evidently the other 

 extreme of this series of lichens, so manifestly connected by the 

 spores. 



8. C. aggregatum, Nyl. ; thallus of middling size, orbicular, 

 membranaceous - cartilagineous, sub - monophyllous, lobate - pli- 

 cate and fenestrate, marked with conspicuous, anastomosing, 

 rugose -granulate ridges; from bright- becoming blackish -green; 

 beneath pale ; apothecia of middling size, somewhat elevated, 

 flattish, mostly in bunches on the ridges ; the disk reddish, the 

 margin sub-entire. Spores long-fusiform, plurilocular, decel- 

 erate, ^J mic. Nyl. Syn. l,p. 115. Synechobl., Koerb. Parerg. 



p. 419. 



b. implicatum ; scarcely differing but in now larger apothe- 

 cia, and stouter spores, ^ mic. C. implicatum, Nyl. Prodr. 



N. Gran. p. 2 ; & in herb. Lindig, n. 749. 



c. glaucophthalmum ; like the last, but the apothecia white- 



pruinose. Spores ^y mic. C. glaucophthalmum, Nyl. Syn. 1, 



p. 114; Prodr. N. Gran. p. 2; & in herb. Lindig, n. 813. 



Trees, &, Mexico, Nylander, 1863 ; as also in Cuba, Wright ; 



Venezuela, Wagner-, Fendler-, and New Granada, Lindig. 



c, Mexico, Nylander Syn., 1858. New Granada, Lindig. 



These lichens have all the same thallus, and are generally 

 similar. 



S(d). C. leptaleum, Tuckerm.; with the thallus of C. aggre- 

 gatum, and apothecia varying, like those of the varieties of that 

 lichen, now to ample, but better characterized than the latter 



by its smaller, vermiform spores, with obtuse ends, ^ mic. 



Obs. Lich. I c. 6 ; p. 263. 



