PAtftfARIA. 123 



(Richardson), Leighton in Linn. Soc. Journ. 1867. Described 



from European specimens ; I have seen no others. The lichen 

 is so near to the last, that that was referred to it by both Som- 

 merfelt and Fries. The spores become indeed bilocular, and 

 incongruous therefore with the type of the present section ; but 

 they are perhaps more commonly like those of the last species, 

 which attain finally to the same shape and size. 



13. P. tryptophylla (Ach.) Mass.; thallus squamulose-folia- 

 ceous, membranaceous ; from pale-yellowish soon becoming 

 livid-brownish ; squamules stellate- expanded, lacero-laciniate, 

 erose and dentate-granulate, passing then into a densely coral- 

 line-granulose crust; upon a bluish-black hypothallus; apo- 

 thecia small, biatorine, sessile ; the disk chestnut-brown, finally 

 convex ; and the thin paler margin disappearing. Spores ellip- 

 soid, simple, decolorate, ^J mic. Th. Fr. Lich. Arct p. 76. 



Nyl. Scand. p. 125. 



Trunks, and stones, New England and New York, Tucker- 

 man Syn. N. E. 1848. South Carolina, Ravenel. Louisiana, Hale. 



The South Carolina specimens, and those from Louisiana, 



do not appear to differ from P. nigro-cincta, Nyl. in Lindig herb. 

 N. Gran. n. 818 ; but all three are clearly referable, if I mis- 

 take not, to the older species before us. The other lichens 

 named nigro-cincta in Lindig's collection (n. 2623, 2882, 18 of 

 2d collection) together with Montague's original Juan Fernandez 

 specimens of his species, and Wright Lich. Cub. n. 103 in great 

 part at least, seem, in like manner, referable to a reduced P. 

 pannosa ; n. 18, in particular, not offering any differences from 

 Wright Cub. n. 102, which should be the original pannosa of 

 Acharius. The dimensions given in Nyl. Prodr. N. Gran. p. 27, 

 might be supposed to mean that the spores of P. nigro-cincta 

 are smaller than those of P. pannosa ; but an examination of 

 seven specimens of the former, four of them named by the 

 author cited, shews that both species agree very well, in all 

 respects, in their spores. 



14. P. melamphylla, Tuckerm. in litt. ; thallus orbicular, 

 squamulose, membranaceous ; from black-green becoming quite 

 black ; the minute squamules stellate-expanded and crenate at 

 the circumference, but somewhat imbricated at the centre where 

 they pass into a ragged crust ; apothecia. . . 



Rocks (schist) Vermont, Frost. Texture parenchymatous 



