184 NEW LICHENS. 
This has the apothecia of P. venosa, Ach., and the thallus 
of P. canina, Ach.; but the inferior surface differs from 
that of either of these, being snow-white and cottony, 
except where the veins occur. 
2. P. pulverulenta, Tayl. ; thallo cinereo-livido, elevato- 
punctato, subtus concolori, subavenio, villoso, lobis sub- 
incisis, retusis ; apotheciis concavis, disco atro-rufescenti, 
margine crenulato, extus verrucosis. 
Has. Pillzhum, Columbia; Prof. W. Jameson.—Thallus 
suborbicular, flaccid and rugose when wet. Apothecia on 
proper stalks of the thallus. Inferior surface villose as 
in the stictee ; the upper surface is thickly sprinkled over 
with subangular concolorous grains, not observed in its 
congeners, 
3. P. erumpens, Tayl.; thallo orbiculari, cinereo-virescenti, 
inciso-lobato, lobis rotundatis subintegerrimis, subtus 
elevato-venosis; gemmis sorediatis, pulverem glaucum 
effundentibus, centralibus; apotheciis terminalibus, sub- 
pedicellatis, rotundis, convexiusculis, atro-purpureis, sub- 
integerrimis. : 
Has. On sides of clay ludas Dunkerron, county of Kerry. — 
—Thallus 1-2 inches wide; glaucescent when wet, ash- - 
coloured when dry, thin in structure ; apothecia few. 
Buds central, five or six together, rarely ‘confluent, round, — 
shallow eruptions of the thallus containing a glaucous | 
powder. de these buds it is separated from all known - 
| Dvrounza, Ach. 
+ D. mE Tayl; thallo pulvinato, planne plumbeo es 
centro affixo Pronos erecto, lobis psi es 
pičksisijus, bai compressioscalia mugosique; : poth 
terminalibus, subimmersis, pere n 
tenuissimo, pruinoso, viridi-atro. 
He ne ‘Bashman’s 4 B UT 
