298 LICHENACEI. [PHYSCIA. 
Applecross, Ross-shire. Carrigaloe, co. Cork; Muckruss, Killarney, co. 
Kerry. 
Form 1. virescens Nyl. Bull. Soc. Bot. t. xiii. (1866) p. 366.— 
Thallus pale-greenish. Apothecia scattered, the margin thin, entire, 
greenish. Form viridescens Cromb. Journ, Linn. Soc. Bot. xvii. 
p. 572. Lichen parietinus var. 2, With. Arr. ed. 3, iv. p. 34. 
Differs from the type in the colour of the thallus, which evidently 
results from the habitat, since in the herbarium it again partially reverts 
to the normal colour, The reaction with K is also less distinct or scarcely 
any. The apothecia are few, but it is rarely seen fertile. 
Hab. On the trunks of trees in moist shady places in upland districts. 
—Distr. Among the 8. and E. Grampians, Scotland; no doubt to be de- 
tected elsewhere.—B. M.: Finlarig, Killin, Perthshire; Drum, Aberdeen- 
shire. 
Form 2. cinerascens Leight. Lich. Fl. ed. 3 (1879) p. 133.— 
Thallus greyish-white. Apothecia with the margin greyish, entire 
or somewhat inflexed.—Cromb. Grevillea, xv. p. 78. 
The colour of this form also depends upon the nature of the habitat. 
It may be considered as a dealbate condition, having the reaction with K 
fainter than in the type. It usually occurs fertile, with the apothecia 
fairly numerous. 
Hab. On the trunks of old trees, chiefly elms, in shady places of mari- 
time and lowland districts.—Distr. Somewhat local and rare in 8, and 
Central England, in 8. Scotland, and in 8. Ireland.—B. M.: St. Leonard’s 
Forest and near Brighton, Sussex; Lymington, Hants; Isham Valley, 
Torquay, Devonshire ; Windsor, Berkshire ; near Cirencester, Gloucester- 
shire ; Twycross, Leicestershire; Malvern, Worcestershire. Cramond, 
near Edinburgh. Carrigaloe, near Cork, 
Var. 3. aureola Nyl. Syn. i. (1860) p. 411.—Thallus orbicular, 
plicato-rugose, vitelline or golden-yellow ; lobes concrete, dilated, 
plicate and inciso-crenate at the apices. Apothecia with the margin 
at length crenulate——Mudd, Man. p. 113; Leight. Lich. Fl. p. 143, 
ed. 3, p. 1382.—Paurmelia aureola Ach. Lich. Univ. (1810) p. 487 ; 
Syn. p. 210.—Brit. Hxs.: Larb. Lich. Hb. n. 212. 
Distinguished by the plicato-rugose and more closely lobed thallus, 
which is also occasionally somewhat granulate in the centre, and there 
also frequently more or less zonately centrifugal. When fertile the apo- 
thecia are numerous, the margin becoming crenate, in this respect also 
differing from the type. 
Hab. On trunks of trees and on walls in maritime and upland districts. 
—Distr. Only here and there throughout England, in 8. Wales, and in 
E. Scotland.—B. M.: near King’s Lynn, Norfolk; Withiel, Cornwall; 
Buxton, Derbyshire ; Twycross, Leicestershire; Tenby, Pembrokeshire ; 
ane Westmoreland. Near Edinburgh ; Cove, Kincardineshire ; near 
erdeen, 
Form congranulata Cromb. Grevillea, xv. (1887) p.'78.—Thallus 
