176 NEW LICHENS. 
3-4 inches wide, rugged, irregularly channelled, the edges 
waved and raised; the lobes subimbricated. From the 
European P. sulcata, Tayl., the present may be known by 
its browner colour, more channelled lobes, by the furrows 
in which the buds appear being more slender and more 
simple, whilst the buds themselves are white. 
41. P. Wallichiana, Tayl.; thallo orbiculari, albo, glabro, 
subtus atro, hispido, lobis rotundato-sinuatis, crenatis ; 
gemmis concoloribus, minutissime granulatis, demum 
elongatis; apotheciis sessilibus, fusco-castaneis, margine 
rupto, incurvo, gemmifero. 
Has. Nepal; Wallich.—Thallus 8-10 inches wide, coarsely 
. wrinkled, smooth, decurved at the margins, whose termi- 
nations are brown and shining, cream-coloured, beneath 
blackish with very short hispid trice. Lobes cuneate. 
Apothecia central, crowded, very concave, the disk red- 
dish-brown. Ours differs from P. scortea, Ach., by the 
flatter thallus, whose lobes are less deeply divided, and 
more regularly crenate, by the short tricæ of the inferior 
‘surface, and by the pale granulate buds which reappear on 
the margins of the apothecia. 
- CETRARIA, Ach. 
I. C. citrina, Tayl.; thallo amplo, somplanstoy procumbente, 
quide Acme subtus albidiori, utrinque nudo afque 
vigato, ragoso-lacunoso, lobis late linearibus, subdicho- — 
tomis, | canaliculatis ; “semis —Ó granulatis, — 
| poli. minutis, iesus fuscis, dores convexis. v 
atque marginem thallodem subcrenulatum excludentibus. — — 
Has. On trees; Java; Hook. ,—Thallus 5-6 inches — 1 
wide. Lobes oblig; subsinuate, their margins at —-— e 
entire, at length fringed with minute, concave, Ar 
buds. Below the thallus are a few, scattered, pale fibres. 
RE been cue osa en mE 
