416 PROCEEDINGS OF THE AMERICAN ACADEMY 



discum concolorem cingente. Tliecte clavato-cylindracese, octosporse. 

 Spora3 incolores, parvulae, cymbiformes vel subfusiformes, 4 - 8-blasta3, 

 sporoblastis subregularibus, diam. 3 - 5-plo longiores. Trunks of elms 

 and ashes, Massachusetts. Perhaps not rare, but easily passed over, 

 though the apothecia are visible to the naked eye. The lichen is ex- 

 ternally exceedingly like G. cornea {Lecidea carneola, Auct.), and long 

 passed for it in ray hei'barium ; but it is darker, and the spores are dif- 

 ferent. These, in our American lichen, are at first exactly cymbiform, 

 with three to four regular sporoblasts, and about twice and a half long- 

 er than wide ; but the tips are often acuminated, and the spore be- 

 comes at length more spindle-shaped, with four to eight sporoblasts, 

 and from four to five or even six times longer than wide : while in 

 G. cornea (Herb. Borr. ; Nyl. Lich. Par. n. 132 ; Rabeuhorst, Lich. 

 Eur. n. 445) we have constantly acicular, plurilocular spores, with from 

 twelve to twenty sporoblasts, and as many times longer than wide. 

 L. cornea has been regarded by almost all lichenists as belonging to 

 Lecidea; but Mr. Borrer considered it, in 1842, nearly related to 

 Gyalecta ; and Dr. Nylander, in his later works, places it with the same 

 group, considered by him as making the first section of Lecidea. 

 Paraphyses not unlike those of the preceding species. 



C<-ENOGOXiUM MONiLiFORME, sp. nov. : thallo effuso margine laxiori 

 pallidiori sublimitato e filamentis breviusculis gracillimis articulis ad 

 septum constrictis mox subglobosis centro crustaceo-agglomeratis e 

 glauco-viridi fulvescentibus ; apotheciis appressis subplanis, excipulo 

 cupulari discum carneolo-rubellum margine albo cingente. Sporie oc- 

 tonai in thecis lineari-clavatis, incolores, oblongs, diblastae, diam. 3-4- 

 plo longiores. On trunks, in the island of Cuba, Mr. Wright. Thallus 

 effuse, more crust-like than in other species, made up of short monili- 

 form filaments ; the joints, by constriction at the dissepiments, becoming 

 more or less rounded, from glaucous-green at length tawny-brown ; 

 the margin of the fronds a little paler. Apothecia quite those of the 

 genus. Spore-sacks clubshaped ; the eight spores disposed, now in a 

 single, and now rather in a double series. Spores oblong-ellipsoid, or 

 somewhat fusiform-ellipsoid, scarcely as long as those of C. confervoides, 

 Nyl. (to which, described in Lich. Exot. 1. c. p. 242, I refer a Cuba 

 lichen collected by Mr. "Wright), typically septate-diblastish. Para- 

 physes aciculiform, as in all the species. Beside C. confervoides, ex- 

 tending northward as far as Louisiana, and approaching near to, though 

 it appears distinct from, (7. Linkii, upon which Ehrenberg constituted 



