372 LICHENACEI, [LECANORA. 
and upland tracts.—Dist7, General and common in the Channel Islands, 
and throughout Great Britain; apparently rare in W. Jreland—B. M.: 
Islands of Jersey and Sark. Norwich, Norfolk; Wimpole Park, Cam- 
bridgeshire ; Bonchurch and St. Lawrence, Isle of Wight; Torquay, 
Devonshire ; Withiel, Cornwall; Cirencester, Gloucestershire ; near 
Windsor, Berkshire ; Oswestry, and near Shrewsbury, Shropshire ; near 
Monmouth; Island of Anglesea; near Ayton, Cleveland, Yorkshire ; 
Brougham Castle, Westmoreland; Hexham, Northumberland; Lam- 
plush, Cumberland. Near Edinburgh; Gourock, Renfrewshire; Cupar, 
ifeshire ; King’s Park, Stirling; near Doune, Perthshire; Wills Braes, 
Forfarshire ; Nigg, Kincardineshire; near Aberdeen. Dunkerron, co. 
Kerry ; near Kylemore, Connemara, co. Galway. 
Form depauperata Cromb. Grevillea, xviii. (1889) p. 45.—Thal- 
lus effuse, little developed, the granules minute, very much scattered. 
Apothecia small; otherwise asin the type.—Brit. Ews.: Larb. Lich. 
Hb. n. 128. 
The thallus is but sparingly visible, and at times inspersed here and 
there over what seems to be Pannularia nigra, upon which the fructifi- 
cation then looks as if parasitic. 
Hab. On granitic rocks in maritime tracts.—Distr. Seen only from the 
Channel Islands and N.W. Ireland.—B, M.: Island of Alderney, Kyle- 
more, Connemara, co. Galway. 
28. L. flavocitrina Nyl. Flora, 1886, p. 461.—Thallus indeter- 
minate, thinnish, minutely squamulose, citrine-yellow ; squamules 
appressed, more or less citrino-pulverulent (K+purplish). Apo- 
thecia small, somewhat concave or plane, biatoroid, orange-yellow 
(K+purple), the margin entire, paler; spores ellipsoid, polari- 
bilocular, 0,007-10 mm. long, 0,006 mm. thick—Cromb. Grevillea, 
xviii. p. 45. 
Subsimilar to the preceding species, but differs in the character of the 
thallus and in the biatoroid apothecia. The squamules are either 
entirely citrino-pulverulent, or only so at the margins. The specimen 
seen is well fertile, with occasional traces of a thalline margin to the 
young apothecia. 
Hab. On schistose walls in an upland situation.— Distr. Only in N.W. 
England (Staveley, near Kendal, Westmoreland). 
29, L. incrustans Ach. Lich. Univ. (1810) p. 405; Nyl. Flora, 
1883, p. 106.—Thallus effuse, crustaceous, verrucose, more or less 
diffract, pale-yellow, subpulverulent (K + purplish). Apothecia 
small, plane or slightly convex, deeper yellow, pruinose (K + purplish), 
the thalline margin thickish, entire ; spores ellipsoid, polari-bilo- 
cular, 0,008-13 mm. long, 0,004-8 mm. thick.—Cromb. Grevillea, 
xviii. p. 45. 
A plant seldom rightly discriminated. It is allied to L. cttrina, from 
which it may be recognized by the paler thallus and apothecia. In the 
only British specimen seen, the argthects are numerous with the thalline 
margin persistent. The spermogones have the spermatia oblong or 
subellipsoid, 0,020-25 mm. long, 0,005-7 mm, thick, 
