384 PROCEEDINGS OF THE AMERICAN ACADEMY 



apotheciis minutis submarginalibus innato-prominulis demum pallidis 

 tuberculiformibus disco punctiformi impresso. Sporae in thecis elongato- 

 clavatis octonae, ellipsoideae vel demum oblongo-elHpsoidea;, incolores, 

 simplices, protoplasmate in guttulas (1-2) secedente diam. lJ--2|-plo 

 longiores. " On rocks in rivulets, overflowed after rains," in the island 

 of Cuba, Mr. Wright. Thallus rather thin, but firm, smooth, blackish- 

 green or nearly black, (the largest specimens, perhaps, an inch in their 

 longest diameter,) dividing at the centre into wavy lobes, with wider, 

 rounded, repand tips, and becoming more or less sinuate-lobate, with 

 often a plume-like aspect ; or, less regularly, passing into narrower 

 divisions. Gonimous granules of scarcely middling size, subsolitary, 

 the filamentous elements amongst which they are interspersed being 

 exceedingly delicate. Apothecia minute, superficial, becoming at 

 length a little paler than the fronds, disposed in necklace-like chains, 

 or sometimes in heaps, at or near the margin of the lobes, tuberculi- 

 form, and the disk punctiform-impressed, or more rarely at length flat- 

 tened and sublecanorine. Spores in eights, in long-club-shaped spore- 

 sacks, colorless, ellipsoid, or at length oblong-ellipsoid, simple ; the 

 protoplasm dissolving more or less into roundish drops ; once and a 

 half to twice and a half longer than wide. Paraphyses distinct, fili- 

 form. The subsolitary gonimous granules and more delicate filamen- 

 tous elements separate this plant, as does also the thinner and more 

 divided thallus, from Omphalaria Girardi, DR. & M., the type of the 

 genus, both with Montague and Nylander ; but I know of no lichen with 

 which I should sooner compare it. 0. Girardi is, however, only known 

 to me in infertile specimens (determined by Dr. Nylander, Syn., p. 99) 

 which were detected by T. M. Peters, Esq., in Alabama. Collema 

 laciniatum, Nyl. 1. c. p. 11 G, which accompanies the Alabama lichen, 

 grows intertangled with the present in Cuba. The apothecia of the 

 present are at length rather prominent, for the most part perithecii- 

 form ; but they assume at length, in the oldest condition, a more reg- 

 ular and sublecanorine aspect. 



Omphalaria lingulata, sp. nov. : thallo subcartilagineo viridi- 

 fuscescente (fusco-nigrescente) e basi umbilicato-afiixo in lobos spathu- 

 lato-oblongos subsimplices plano-convexos subtus obscuriores diviso ; 

 apotheciis sparsis minutis crinatis pallidis disco impresso margine in- 

 tegro subprominulo demum cincto. Sporas octonae in thecis clavatis, 

 incolores, oblongo-ellipsoideae, simplices, protoplasmate granulosa vel 

 guttulosa diam. 2-3-plo longiores. On rocks, " Farallones la Cavalina 



