238 CYCLOCARPINE® [PHYSCIA 
adnate, wrinkled, laciniate, crenate at the circumference, greyish- 
pruinose, greyish-white or light-brownish, densely sorediate on the 
margins, especially towards the centre of the thallus; beneath 
dark and rhizinose (K—). Apothecia small or moderate in 
size, the margins becoming lacerate-sorediate ; spores 24-28 p 
long, 15-18 p thick.—Ph. pulverulenta var. pityrea Cromb. Lich. 
Brit. p. 39; Leight. Lich. Fl. p. 146; ed. 3, p. 1553 subsp. 
pityrea Nyl. ex Lamy in Bull. Soc. Bot. Fr. xxv. p. 383 (1878) ; 
Cromb. in Grevillea xv. p. 78 & Monogr. i. p. 308. Lichenoides 
glaucum orbiculare, seqmentis latiusculis, scutellis nigris Dill. Hist. 
Muse. p. 177, t. 24, fig. 71c (1741). Lichen griseus Lamarck 
Encycl. Méth. iii. p. 480 (1789). L. pityreus Ach. Lich, Suee. 
Prodr. p. 124 (1798); Engl. Bot. t. 2064. Parmelia pityrea 
Ach. Lich. Univ. p. 483 (1810); Hook. in Sm. Engl. Fl. v. 
p. 201. Borrera pulverulenta var. grisea Mudd Man. p. 111 
(1861). 
ae Cromb. n. 51 ; Johns. n. 128; Larb. Lich. Hb. n. 48 ; 
Leight. n. 370; Mudd n. 83. 
Similar to Ph. pulverulenta in the pruinose thallus, but thinner in 
texture, and along with the margins of the apothecia, densely sorediate. 
The soredia, which at first line the margins of the lobes, sometimes 
spread over almost the whole centre of the thallus. 
Hab.—On the trunks of trees, rarely on old walls, in maritime, 
lowland and upland districts.—Disty. General and common in 
England, rarer in the Channel Islands and Scotland, not yet recorded 
from Ireland.—B.M. Guernsey; Basingstoke and Lymington, Hants ; 
Ryde and Appuldurcombe, I. of Wight; Shoreham, Glynde, Wake- 
hurst Park and Wolstonbury, Sussex; Hythe, Kent; Edgware and 
Harefield, Middlesex ; Epping Forest and Braxted Park, Essex; near 
Elstree, Herts; near Cheltenham, near Cirencester and Bourton-on- 
the-Water, Gloucestershire; Windsor, Berks; Milton, Oxfordshire ; 
Malvern and near Kempsey, Worcestershire; Harboro’ Magna, 
Warwickshire ; Ludlow Park, Shropshire; Aberdovey, Merioneth ; 
Carlton, Cleveland, Yorkshire; Windermere, Westmoreland; Appin, 
Argyll; Blairdrummond near Stirling; Glen Ample, Perthshire ; 
Drum near Aberdeen. 
8. Ph. stellaris Nyl. in Act. Soc. Linn. Bord. sér. 3, i. p. 307 
(1856) (excel. vars. leptalea and tenella).—Thallus orbicular- 
stellate, appressed, compact or sometimes imbricate in the centre, 
the lobes at the circumference contiguous, somewhat convex, 
more or less deeply incised and crenate, greyish or greyish-white, 
generally darker towards the centre; beneath whitish, with grey 
or dark-coloured much-branched rhizinee (K +"), Apothecia 
rather small, sessile, the dise blackish, greyish-pruinose or naked, 
the margin entire or crenulate; spores 16-24 p» long, 8-11 pu 
thick.—Cromb. in Grevillea xv. p. 78 (1887) pro parte. Ph. 
retrogressa Stirton in Trans. Glasg. Soc. Nat. p. 85 (1875); 
Leight. Lich. Fl. ed. 3, p. 138. Lichen stellaris L. Sp, PI. 
p. 1144 (1753). Parmelia stellaris Ach, Lich, Univ. p. 476 
