508 LICHENACEL [PERTUSARIA. 
A peculiar plant, looking, with its white spurious margin, as if allied 
to Levidea coarctata, but with all the essential characters of this genus. 
Superficially it still more resembles Z. carneolutea (Turn.), but among 
other characters at once differs in the simple spores. Nylander observes 
(Lich. Scand. p. 197) that there are scanty gonidia towards the base of 
the apothecia and that their margin consists chiefly of minute crystals of 
oxalate of lime.. In the two British specimens the thallus is almost 
obsolete. 
Hab, On the bark of alders in mountainous regions.—Distr. Seen only 
from the 8.W. Highlands of Scotland and N. Wales.—B. M.: Appin, 
Argyleshire. 
25. P. inquinata Fr. fil. Bot. Not. 1867, p. 108.—Thallus sub- 
determinate, areolato- or verrucoso-rimose, greyish (K—, CaCl—). 
Apothecia innate, one or several in each areola, the ostioles some- 
what plane, variously flexuose, and rotundate, the margins irregular, 
thin, persistent, paler ; spores 0,025-30 mm. long, 0,014-18 mm. 
thick.—Leight. Lich. Fl. ed. 3, p. 2835; Cromb. Grevillea, xix. 
p. 59.—Lecanora coarctata 3. inquinata Ach. Lich. Univ. (1810) 
p. 353. 
Might readily be taken for a Lecanora allied to L. gibbosa or L. cinerea, 
as noted by Th. M. Fries (Lich. Scand. p. 311), The microscopical 
characters of the apothecia, however, show its true place, though, with 
the following, it has in other respects a connection with the Aspicilia 
section of Lecanora. In the few fragmentary British ree a which 
are well fertile, the thallus is thinnish, though elsewhere it varies in 
thickness, according to the nature of the substratum. 
Hab. On rocks in maritime and upland situations— Distr. Very local 
and scarce in N.E. England (Gunnerton Craggs, Northumberland), W. 
Treland, and the 8.W. Highlands of Scotland.—B. M..: Barcaldine, 
Argyleshire. Lettermore, Connemara, co. Galway. 
26. P.nolens Nyl. Flora, 1864, p. 89.—Thallus determinate, 
smooth, areolato-rimose, greyish (K—,CaCl—). Apothecia innate, 
not prominent, two or more approximate, colourless within; the 
ostioles plane, difform, rotundate or oblong, black, whitish at the 
margins ; spores 0,030-42 mm. long, 0,015-22 mm. thick.— 
Carroll, Journ. Bot. 1865, p. 289; Cromb. Lich. Brit. p. 61; 
Leight. Lich. Fl. p. 245, ed. 3, p. 235. 
Probably not specifically distinct from the preceding, to which it is 
intimately related ; though differing, among some minor characters, in the 
larger spores. In his observations upon ihe original specimen gathered 
by him, Admiral Jones (Nat. Hist. Boe, Dublin, May 1864) says :—“ In 
the beginning this plant might be supposed to be ‘ Urceolaria,’ but the 
Urceolarian appearance is of short duration. There are no prominent 
warts as in Pertusaria, but the nuclei are in masses, as in this genus, and 
the ostioles are irregular in form with a white pulverulent margin. 
Internally the plant is altogether a Pertusaria in asci, spores and 
paraphyses.” 
Hab. On rocks in maritime districts.—Distr. Only very sparingly in 
N.E. and W. Ireland—B.M.: Glenarm, co. Antrim ; Lous eagh, 
Connemara, co. Galway. 
