OP ARTS AND SCIENCES. 405 



elegantly brancli-lobed thallus, the longer portions of which closely 

 resemble a delicate feather, or (as implied in the Latin terms pliima- 

 rins and plumatilis) fine embroidered work, or lace. Of the species 

 nearest related, which are all flat-lobed, P. tryptophylla differs in the 

 colors, in the lobation of its very flat and thin divisions, and in its 

 apothecia ; P. microphylla in its closely imbricated crust of small, 

 notched (but " never laciniate-dissected," Fr.) true squamules, and its 

 smaller, oWo?z(7-ellipsoid spores ; and P. Sauhinetii (Montag.), Nyl., a 

 tree-lichen, of which I have been kindly favored with a specimen by 

 the generous author, in the colors, the distinct configuration of the 

 scarcely lobate, larger, and flatter scales, and, like the last, to which it 

 is much nearer than is the present, in its oblong spores. Beneath, 

 our plant is much of the same color as above, but traces of a blackish 

 hypothallus are more or less discernible at the centre. Apothecia 

 somewhat immersed, bright brownish-red, convex, and the thin, bia- 

 torine exciple (which has sometimes an apparent, more or less perfect, 

 crenate, but spurious thalline border) scarcely discernible. Spores 

 ellipsoid, rather sharp at the tips, wdiich are often somewhat elongated ; 

 more or less tinged with a hue like that of the gonimous granules ; lim- 

 bate, and the protoplasm commonly separating into irregular, more or 

 less rounded sporoblasts, which are often in polar opposition ; from 

 twice to four times longer than wide. 



Lecidea microps (Fr. Herb, sub Parmelici), sp. nov. : thallo 

 minusculo granuloso-subsquamaceo imbricato glaucescente ; apotheciis 

 minimis biatorinis rufescentibus concavis vel excipulo thallino tenui 

 integro receptis, Spone octona?, ovoidere, incolores, simplices, diam. 

 2 - 2|-plo longiores. Lecidea pezizoidea, Schwein. Herb., non Ach. 

 Parmelia microps, Fr. Herb. On the earth, Salem, North Carolina, 

 Schweinitz. I possess only a fragment, given to me by Professor 

 Fries, who had it from Schweinitz. The Lichen has points of re- 

 semblance to Lecanora amniocola, but differs in the spores. It may 

 also be compared with Lecidea coarctata, but appears certainly distinct 

 from it. The whole is so small, that an ordinary lens is hardly suflli- 

 cient to examine its characters ; and I offer it here only for further 

 investigation. 



Lecidea oidalea, sp. nov. : thallo crustaceo tenui subcartilaglneo 

 demum contiguo la3vigato rimoso verrucoso-areolato flavo-viridi-glau- 

 cescente; hypothallo nigro sublimitato; apotheciis (mediocribus) cupu- 



