OF ARTS AND SCIENCES. 385 



(M. Revel, near Sagra)," in the island of Cuba, Mr. Wright. Thal- 

 lus rather thinnish, but cartilagineous, fragile, of a brownish-green 

 becoming at length blackish-brown color above, and mostly, or at 

 length, darker below, dividing at the umbilicate base into oblong, spat- 

 ulate, or tongue-shaped lobes, which are commonly subsimple, but 

 occur also irregularly, and similarly but sparingly lobulate ; slightly 

 convex above, and margined for the most part, but scarcely cana- 

 liculate, below. Gonimous granules glomerulate, interspersed among 

 anastomosing filamentous elements. Apothecia minute, scattered, in- 

 nate, pale ; the small impressed disk bordered by an at length slightly 

 prominent and entire thalline margin. Spores in eights, in club- 

 shaped spore-sacks, colorless, oblong-ellipsoid, simple ; the protoplasm 

 becoming guttulose or granulose ; twice to thrice longer than wide. 

 The apothecia resemble the smaller ones of Collema pustulatum, Ach. 

 (nor does it appear otherwise than likely that the commonly verru- 

 carioid apothecia of the last species express anything else than the 

 lecanorine type, in a state the perfect development of which is for 

 the most part precluded), and are sprinkled pretty thick over the 

 thallus, much as in that species ; but the gonidia are not concatenate, 

 but glomerulate in the present, which is also affixed at a single point at 

 the base, as in Omphalaria. The dimensions of the lichen vary from 

 half to three quarters of an inch in the longest diameter, but single lobes 

 occur among the specimens, which are much broken, of the same length. 



Collema coccophorum, sp. nov. : thallo minuto orbiculari crasso 

 nigro lobis periphericis expansis crenato-incisis centralibus adscenden- 

 tibus granulato-lobulatis ; apotheciis majusculis subplanis disco rufo- 

 fusco margine thallino tenui cincto. Sporse octonge, incolores, ellipsoi- 

 dejB 1. ovoideo-ellipsoidege, diblastte 1^ - 2|-plo diametro longiores. 

 On sandy earth in the valley of the Rio Grande, Texas, Mr. Wright. 

 Small, roundish fronds, the largest of which a little exceed an inch 

 through, of very small, thickish, black lobes, which ax'e radiose-ex- 

 panded, and crenate-cut, at the circumference, with mostly raised, at 

 length granulate margins ; and becoming towards the centre densely 

 lobulate-granulate (with the aspect of a crust of black granules). Go- 

 nimous granules concatenate, amongst anastomosing filaments. Apo- 

 thecia largish (often a line and a half through), flattish or plano-con- 

 vex, the dark-reddish-brown disk enclosed by a thin, at length un- 

 even and even granulate thalline margin. Spores colorless, ellipsoid 

 and ovoid-ellipsoid, simple, or at length diblastish, once and a half to 



VOL. V. 49 



