PHYSCIA. | PHYSCIEI. 297 
glaucous-white. Apothecia small or moderate, nearly plane, with 
entire thalline marginMudd, Man. p.112; Cromb. Lich. Brit. 
p. 87; Leight. Lich. Fl. p. 142, ed. 3, p. 181.—Physcia villosa, var. 
Dickieana Linds. Trans, Roy. Soc. Edin. t. xxii. (1867) p. 254. 
Apparently but an accidental state of the type, depending upon the 
nature of the habitat. It is distinguished by the pale thallus and the 
entire margin of the apothecia, which latter character, however, some- 
times occurs in the type itself. 
Hab, On shady rocks in maritime districts —Distr. Very local and 
rare in the Channel Islands (?) and in N.E. Ireland.—B. M.: Newcastle, 
co. Down. 
3. P. parietina De Not. Mem. R. Ac. Sc. Turin, ser. 2, x. (1849) 
p. 387.—Thallus suborbicular, appressed, imbricato-lobed, smooth, 
yellow ; beneath paler or pale-whitish, sparingly fibrilloso-rhizinose ; 
lobes somewhat plane or concave, rounded and crenate at the mar- 
gins (Kf violet-purplish, CaCl—). Apothecia moderate, concave or 
plane, subconcolorous, the margin entire or nearly entire; spores 
0,012-16 mm. long, 0,007-9 mm. thick——Mudd, Man. p. 1138; 
Cromb. Lich. Brit. p. 38; Leight. Lich. Fl. p. 142, ed. 3, p. 181.— 
Parmelia parietina Gray, Nat. Arr. i. p. 488; Hook. Fl. Scot. ii. 
p. 52; Sm. Eng. Fl. v. p. 204; Tayl. in Mack. Fl. Hib. ii. p. 141. 
Lichen parietinus Linn. Sp. Pl. (1753) p. 1143; Huds. Fl. Angl. 
p. 447; Lightf. Fl. Scot. ii. p. 822; Eng. Bot. t. 194; With. Arr. 
ed. 3, iv. p. 34. Lichenoides vulgare sinuosum foliis et scutellis luteis 
Dill. Muse. 180, t. 24. £.'76. Lichenoides crusta foliosa scutellata, 
flavescens Dill. in Ray Syn. ed. 3, p. 72, n. 59.— Brit. Ews.: Leight. 
n. 10; Mudd, n. 85; Larb. Lich. Hb. n. 9; Bohl. n. 12, d 
A very common and well-known plant, easily recognized by its bright- 
yellow, smooth, appressed thallus. At first sight it looks as if it were a 
Parmelia,.but its essential characters are those of this genus. It varies 
considerably in colour and in the character of the laciniw, which give 
rise-to the forms and varieties described. With us, as elsewhere, it is 
commonly fertile, the apothecia being chiefly central and crowded, with 
the margin somewhat thickish and inflexed or thin and entire. The 
spermogones are not very frequent in the type. They are usually more 
or less congregate, inclosed in thailine protuberances, with spermatia 
0,0025 mm. long, 0,00915 mm. thick. 
Hab. On the trunks and branches of trees, old pales, and walls, in mari- 
time, lowland, and upland districts.—Distr. Very general and plentiful 
throughout Great Britain and probably Ireland.—B. M.: Bury St. Ed- 
munds, Suffolk ; Edgeware, Middlesex; Lydd, Kent; Lewes, Sussex ; 
Appuldurcombe, Isle of Wight; Plymouth, Devonshire; Cirencester, 
Gloucestershire ; Windsor, Berkshire ; Madingley Park, Cambridgeshire ; 
near Worcester; Harboro’ Magna, Warwickshire; Grimsbury Green, 
Northamptonshire; Matlock and Buxton, Derbyshire; near Shrewsbury, 
Shropshire ; Island of Anglesea; Cleveland, Yorkshire; Levens, West- 
moreland; Hexham, Northumberland. New Galloway, Kirkcudbright- 
shire; near Stirling; Finlarig, Killin, Perthshire ; Dundee, Forfarshire ; 
Drum and Castleton of Braemar, Aberdeenshire ; Abernethy, Banffshire ; 
