270 PROCEEDINGS OF THE AMERICAN ACADEMY 



in that species, is wholly wanting in this. The spores, though not 

 dissimilar, generally, to those of T. platycarpum, are somewhat larger, 

 and the outline is constantly a little different. It will not be easy to 

 found any subdivision of the present genus on the presence or absence 

 of the interior exciple. 



Thelotkema platycarpgides, sp. nov. : thallo cartilagineo tenui 

 aequabili dein ruguloso pallide viridi-fuscescente ; apotheciis mediocri- 

 bus innato-prominuhs urceolato-scutelliformibus apertura ampla, mar- 

 gins exteriori elevato subintegro dein reflexo discum planum tenuem 

 superne nigricantem albo-pruinosum excipulo interno membranaceo 

 albido connivente instructum cingente. Sp. octonte, pallide fusces- 

 centes, ex ellipsoideo apicibus acutis dein subelongatfe apice altera 

 attenuatffi, 6-blasta3, diam. 3^-4^° longlores. Paraphyses filiformes 

 conglutinatoe. Trunks in the island of Cuba, Mr. Wright (Lich. Cub. 

 n. 157). Differs from T. platycarpum in its 6- (rarely 8-) locular, 

 larger spores, as well as in its smaller, urceolate apothecia, in which 

 the outer margin is more commonly erectish and nearly entire. But 

 the latter feature is not to be relied upon (as already suggested under 

 T. latilabrum), and the lichen occurs in states resembling T. platy- 

 carpum much as the variety of the last-described species does its type, 

 except that here the distinction of the spores continues. 



Thelotrema lirelliforme, sp. nov. : thallo crassiusculo tenuis- 

 sime ruguloso-granulato lasvigato dein tartareo-subfarinoso e glauco- 

 viridulo cinerascente hypothallo fusco-nigro ; apotheciis majusculis 

 innatis lirellato-difformibus, excipulo exteriori prominulo margine crasso 

 subintegi'O discum nigrum velamine albo coopertum cingente. Sp. 

 octonae, oblongo-ellipsoidese, tetrablastge sporobl. integris, dein nigro- 

 fuscae, diam. 2-2J^° longiores. Trunks in the island of Cuba, Mr. 

 Wright (Lich. Cub. n. 150). Belongs to the same gi-oup with the 

 variable T. Auherianum, Mont., and T. Cuhanum of the present writer, 

 but is rather remarkably distinguished by its much-elongated apothecia, 

 sometimes nearly three lines long, and its blackish spores. The lirelli- 

 form exciple, which not unfrequently suggests that of some Graphis, 

 not remote from G. vernicosa, Fee (Nyl. in Herb. Lindig. n. 751, 898) 

 splits sometimes irregularly, becoming 3-4-radiate, recalling short- 

 branched apothecia of the cited Graphis, and still more those of 

 specimens of G. Lyellii (Sm.) Ach. 



Thelotrema catastictum, sp. nov. : thallo subtartareo inaequa- 



