OF ARTS AND SCIENCES : APRIL 12, 1864. 271 



bili dein subtiliter pulveraceo glaucescente ; apotheciis minutis immersis 

 urceolatis thallo submai'ginatis apertura ampla, excipulo laxo margine 

 incurvo discum conoideum nigrescentem cingente. Sp. in thecis 

 elongatis subcyliudraceis octonte, pallide fuscescentes, lato-oblongo- 

 ellipsoideae, 6 - 8-blasta3 sporobl. lentiformibus integris, diam. 2-3° 

 longiores. Paraphyses filiformes conglutinatce. On trunks in the isl- 

 and of Cuba, Mr. Wright. T. compimctum (Sm.) Nyl. (Herb. Lindig. 

 n. 2,885) has not very dissimilar though smaller apothecia, but differs 

 from the present in its muriform-pleioblastish, larger spores, as well as 

 in general habit. 



Thelotrema simplex, sp. nov. : thallo crassiusculo rugoso-verru- 

 coso Igevigato pallide cinerascente ; apotheciis confertis valde minutis 

 thalli verrucis submarginantibus immersis, excipulo subgloboso pallido 

 basi continuo superne nudo radiatim substriatulo poroideo-pertuso 

 discum nucleiformem livescentem fovente. Sp. octonge, mox fuscae, 

 ellipsoidete, 4:-8-blast8e sporobl. dein muriformi-partitis, diam. 1^-3° 

 longiores. Paraphyses conglutinataj. Trunks in the island of Cuba, 

 Mr. Wright (Lich. Cub. n. 154). Belongs to the neighborhood of T. 

 Wightii, (Tayl.) Nyl., and is especially comparable with T. trypane- 

 oides, Nyl. (Wright. Lich. Cub. n. 156), but differs in the conspicuous 

 denudation of the upper portion of the verrucarioid apothecium, and 

 apparently in the spores. The proper (exterior) exciple of Thelotrema, 

 for the most part so conspicuously conditioned by the thallus, has in 

 the present lichen (as also in T. album (Fee), and others of that group) 

 only an accidental relation to it. There can hardly be any doubt that 

 the siiiple receptacle of T. simplex corresponds to the exterior exciple 

 of species with compound receptacles (as compare the not dissimilar 

 T. sphinctrinellum, Nyl. in Herb. Lindig. n. 2808) : but when, as in T. 

 compunctum, the exciple soon separates from the thallus, falling loosely 

 inwards, it is difficult not to take it for the interior, and the rim of 

 thallus, often a little prominent, which surrounds it, as in fact as well 

 as appearance the exterior. 



Gtalecta carneo-luteola, sp. nov. : thallo tenuissimo albo ; 

 apotheciis minutis innato-erumpentibus disco concavo-plano luteolo- 

 rubello margine subconcolori subintegro, velo thallLno dentato-lacero dis- 

 parente. Sp. in thecis elongato-clavatis octonae, incolores, sub-dacty- 

 loideas, ssepius diblast®, diam. 3-5° longiores. Paraphyses filiformes 

 capitulatfe. On trees in the island of Cuba, Mr. Wright. As in G. 



