NEW LICHENS. 191 
on the thallus of a Cornicularia, can scarcely be confounded 
with any other. 
Usnga, Ach. 
1, U. tumidula, Tayl.; thallo cinereo, subcæspitoso, erecto, 
filiformi, dichotomo, glabro-tuberculato, hic illic diffracto, 
intus albidissime stuppeo-fasciculoso, ramis ultimis brevi- 
bus, spiniformibus, apice nigris; gemmis compresso- 
granulatis, levibus, demum pulverem albidum effunden- 
tibus; apotheciis minutis, nudis, sessilibus, demum planis, 
pruinosis, concoloribus, margine demum crenulato. 
Has. No. 1474 (in part). Coquimbo; Cuming, Hook. herb. 
—Tufts dense, rigid, 1-2 inches high. Thallus cylin- 
drical, with irregular smooth swellings and depressions ; 
these last appear to be the buds, discharging a white 
powder. This has the branching of an Alectoria, Sees 
but the central thread of an Usnea. 
2. U. pectinata, Tayl.; thallo pendulo, filiformi, tereti, cinereo, 
ramis simplicibus, subflexuosis, longissimis, fibrilloso-pec- 
tinatis, subcomplanatis, fibrillis tenuissimis, confertis, apice - p 
setaceis, subdecurvis ; gemmis Loue statim pesi e 
"c olumhibus. s... ; s 
Has. Sylhet; Wallich.—Tufts 1-2 feet iun matted to- - 
Bether. Main stem broken transversely into minute joi ts 
This approaches in characters to U. long from 
— Lusatia, which we have not seen; but from Bec ine: it = 
Would appear to be whiter, its stem more scabrous, and - 
i the fibrils of the branches more tortuous. ja x 
U. nidifica, Tayl. ; ; thallo pendulo, elongato, intescantét 
—— — — ramis. "e filiformibus, 
