386 PROCEEDINGS OF THE AMERICAN ACADEMY 



twice and a half longer than wide. This little species, of which abun- 

 dant specimens were collected by Mr. Wright, is comparable with small 

 states of G. cheileum (as Moug. & Nestl., n. 105 G) ; but is more minute, 

 with a different habit of thallus, and spores which appear never to be 

 more than diblastish. The latter feature, if constant, separates it 

 also from other allied species. 



CoLLEJiA CALLiBOTKYS, sp. nov. : thallo medioci'i suborbiculari 

 membranaceo-cartilagineo rigidulo glauco-virescente lobis radiose ex- 

 pansis mox angustatis costatis lobulis adscendentibus capituliformi-dila- 

 tatis vel botryoso-difformibus apotheciis confertissimis mox coopertis ; 

 apotheciis minutis disco concavo-plano rubello excipulo thallino integer- 

 rimo fuscescenti-pallido recepto. Sporae octonie in thecis subcylindra- 

 ceis, incolores, primo subquadrataj, sporoblastis 4 cruciatim dispositis 

 dein longiores, ellipsoidete sporoblastis pluribus muriformi-dispositis vel 

 oblonga^, diam. 2 - 3^-plo longiores. On trunks of Carya, Santee Canal, 

 South Carolina, Mr. Ravenel. Thallus exceeding an inch in diameter, 

 of rather separate, radiose-expanded, somewhat membranaceous but 

 rigid, glaucescent-green lobes, which become narrowed and lacinii- 

 form, and more or less ribbed, as well as sparingly divided, and pass 

 into short, erectish, dilated branches or clusters, covered at length and 

 concealed by the crowded apothecia. Gonimous granules concatenate, 

 amongst distinct, much branched, anastomosing, filamentous elements. 

 Apothecia in crowded clusters, very minute, depressed-globose ; the 

 concave, or at length flat, dark-reddish disk received in an entire, pale- 

 brownish, thalline exciple. Spore-sacks subcylindraceous, octosporous. 

 Spores at first somewhat square ; the four sporoblasts arranged cross- 

 wise, but becoming longer and with more and smaller sporoblasts (more 

 or less murally-polyblastish), and at length ellipsoid or oblong-ellipsoid, 

 and from twice to thrice longer than wide ; the longer ones sometimes 

 pretty regularly tetrablastish, but the sporoblasts more often, or some 

 of them, divided longitudinally. The affinity of this plant is not 

 doubtful. C. verrucifonne, Nyl. ( C. furvum, var. verruciforme, Ach.) 

 is its European analogue, differing (as in Scha3r. Lich. Helv. n. 416, 

 and in the excellent description of Mr. Th. Fries, Lich. Arct. p. 279) 

 in its minuteness, its ascending, densely complicate lobules, and shorter 

 spores, which do not appear to attain to the same development ; and 

 an Asiatic also exists, in C. coccophyllum, Nyl. Syn. p. 112, from the 

 Nilo'herry Mountains in India, presenting spores agreeing exactly 

 (Nyl. 1. c, t. 4, f 20) with the first-described state of the spores of the 



