402 PROCEEDINGS OF THE AMERICAN ACADEMY 



guishes the present plant, which is properly, if I mistake not, insepa- 

 rable from Pannaria. Gonimous granules bluish-green, several not 

 unfrequently concatenate. 



CoccoCARPiA STELLATA, Tuckcrm. in litt. : thallo parvulo orbicu- 

 lari membranaceo plumbeo, laciniis radiantibus lineari-angustatis multi- 

 fidis subtus albis fibrillosis ; apotheciis sessilibus rufo-fuscis (nigrican- 

 tibus) subtus albo-fibrillosis. On Holly {Ilex opaca), Santee Canal, 

 South Carolina, Mr. Ravenel. The larger fronds scarcely surpassing 

 half an inch in diameter, rather darker than C. molyhdcea, and con- 

 spicuously differing from the small forms of this last, which often ac- 

 company it, in its linear, many-cleft lobes. The apothecia are also 

 scarcely appressed, but they possess the other features of those of C. mo- 

 lybdcBa ; and exactly similar ones, which are also fibrillose beneath, 

 occur in an Alabama specimen of the latter, collected by Mr. Peters. 

 Spores immature in all the apothecia examined. 



Lecanora erythrantiia, sp. nov. : thallo crustaceo tenui rimu- 

 loso albo-glaucescente ; apotheciis mediocribus sessilibus, disco piano 

 marginato fulvo-miniato margine thallino crenulato tenuescente. Sporae 

 octonse, incolores, ellipsoideas, polari-diblastae, diam. 2 - 2^-plo longiores. 

 On trunks, island of Cuba, Mr. Wright. L. aurantiaca, on bark (oc- 

 curring in the low country of Carolina, in Louisiana, and in Texas), is 

 undoubtedly near to this, but contrasts strongly with it in its black 

 hypothallus, yellow thallus, and orange fruit. The present and the 

 two following species belong to a group, which on the one hand ap- 

 pears almost to descend from the yellow Placodiums and Physcice 

 (these closely akin elements of the system are brought together in 

 Physcia, Massal., and perhaps more happily in Xanthoria, Th. Fr.), 

 while it passes, on the other, into conditions not at first sight to be 

 distinguished from Lecidea. The group is understood to constitute 

 several genera, in the system as developed by the school of Massalongo 

 (though these genera, and, in addition to them, Amphiloma, Koerb., and 

 Pyrenodesmia, Massal., are now brought together in one, in the " Pla- 

 codium" of Anzi, Cat. Lich. Sondr. p. 39, — an arrangement determined 

 solely by the spores) : but the not inconsiderable difficulties of this dis- 

 position are perhaps to some extent avoided by the simpler view of 

 Dr. Nylander (Enum. Gen. p. 112), which accords very much with 

 the profoundly considered arrangement of Fi-ies (Lich. Eur. p. 161). 



Lecanora Floridana, sp. nov. : thallo parvulo crustaceo tenui 

 contiguo inaequabili glauco-cinerascente hypothallo nigricante sublimi- 



