408 PROCEEDINGS OF THE AMERICAN ACADEMY 



guloso rimoso e glauco-virescente pallide luteo-virente ; apotheciis ma- 

 jusculis e conico-hemisphaerico mox dilatatis scutelliformibus aut difFor- 

 mibus adnatis, excipulo exterior! mai'gine crasso demum fisso-sublobato 

 recurvo albo-velato discum cinereo-nigricantem velo albo subcrustaceo 

 coopertum cingente. SporEC octonse, fusca?, ellipsoideae, tetrablastae, 

 sporoblastis dein subdivisis diam. duplo longiores. On trunks, Monte 

 Verde, island of Cuba, Mr. Wright. Thallus thin, but at length well 

 developed, becoming wrinkled and chinky, from glaucescent-greenish 

 at length acquiring a pale yellowish tinge. Apothecia soon superficial, 

 and depressed-globular, the sides often gibbously irregular (much as is 

 observable in Ascidium Oinchonarum, Fee) ; the rounded aperture 

 white-edged (such apothecia measuring half a line in diameter), but 

 becoming finally dilated and scutelliform (or variously irregular), and 

 from a line to two lines in tlie longest diameter ; the exterior exciple, 

 which is (in section) black within, bordering with an erectish and 

 rather acute, but at length cleft and recurved, white-veiled margin, a 

 thickish, grayish-black disk, closely covered with a crustaceous, white 

 veil. Spores in eights, brown, short and broad-ellipsoid with rounded 

 tips (cocciforra, Koerb.), tetrablastish, the flattened sporoblasts at length 

 irregularly subdivided. The thick, smooth veil sometimes assumes the 

 color of the thallus, or is overspread with it; and, more rarely, the 

 thalline exciple in its earlier subglobose condition becomes continuous 

 above, with the whole aspect of Pertusaria, the interior exciple be- 

 ing indicated, here and there, by differently-colored cracks, or these 

 cracks even assuming at length the appearance of ostioles or of young 

 apothecia. And such pertusariiform apothecia appear also to be com- 

 pound, a cross section showing that the disk is divided more or less by 

 processes from the veil. Compare the anamorphosis of T. Auberianum, 

 alluded to by Montague in Crypt. Guyan. p. 55, as depending on a 

 " hypertrophic des cloisons des excipulum confluents, qui constituent les 

 verrues compos^es de I'espece." And what appears a further atypical 

 variation of structure in the same direction, " analogue a I'dtat varioloide 

 des Pertusaires," is described by the same author in Crypt. Cuba, p. 167. 

 Thelotrkma AURATU3I, sp. nov. : thallo la^vigato ruguloso demum 

 verrucoso crasso pallide stramineo ; apotheciis majusculis superficiali- 

 bus subglobosis, apertura rotundata ampla, excipulo exteriori urceolato 

 margine coarctato-incurvo eroso nigro-punctato discum flavo-pruinosum 

 cino^ente, interior! indistincto. Sporaj octonae, incolores, obtuse ellip- 

 soideae vel oblongo-ellipsoideae, 4 - 6-blast3e, sporoblastis mox subdivisis 



