PLACODIUM | PHYSIACE® 203 
Thallus granular in the centre, sometimes sorediate. 
7. Pl. granulosum Hepp Flecht. Eur. n. 908 (1867).— 
Thallus normally corbicular or sometimes spreading, closely 
adnate, stellate-radiate, the lacinie of the circumference obiong, 
narrow, convex, rugulose, the centre granular-areolate, composed 
of upright separate isidiose like granules, sometimes divided or 
crenulate, deep reddish-yellow (K + purplish). Apothecia rare, 
small, concolorous, the thalline margin entire, becoming sub- 
crenulate; spores 10-16 yp long, 6-8 yp thick.— Amphiloma 
granulosum Miill.-Arg. in Mém.Soc. Phys. Hist. Nat. Genéve xvi. 
p. 380 (1862). Lecanora granulosa Wedd. in Bull. Soc. Bot. 
Fr. xxiii. p. 98 (1876) ; Cromb. in Grevillea xviii. p. 45 (1889) 
& Monogr. i. p. 365. 
Exsicc. Johns. n. 258. 
Not unlike Pl. cirrochroum, but the central granules are more 
compact and not sorediate. The thallus of the specimen in Hb. 
Johns. has no radiate lacini:e. 
Hab. On rocks, chiefly calcareous, in maritime and inland districts. 
—Distr. Not common in W. England and E. Ireland.—b. M. 
Cheddar Cliffs, Somersetshire; St. Bees, Cumberland; Howth near 
Dublin. 
8. Pl. scopulare Oliv. Lich. Eur. p. 96 (1909).—Thallus 
orbicular, rather small, closely adnate, stellate-radiate, the 
lacinie narrow, contiguous, convex, warted-areolate in the 
centre, reddish-yellow(K + purplish). Apothecia small, numerous, 
plane, the thalline margin entire; spores 9-17 p long, 5-7 p 
thick. Lecanora scopularis Ny]. in Flora lxvi. p. 105 (1883) ; 
Cromb. in Journ. Bot. xxiii. p. 195 (1885) & Monogr. i. p. 364. 
Hab. On schistose rocks in a maritime district—B. M. Port- 
lethen, Kincardineshire. 
9. Pl. decipiens Leight. Lich. Fl. p. 176 (1871).—Thallus 
normally orbicular, often irregularly developed, laciniate-radiate 
at the circumference, the lacinie rather narrow, turgid, con- 
tiguous, incised-crenate at the tips, the centre granulate-areolate, 
generally furfuraceous, yellow, or citrine, with concolorous soredia 
(K + purplish). Apothecia small, the thalline margin becoming 
subcrenate ; spores oblong-ellipsoid, sometimes slightly curved. 
10-16 » long, 4-8 pw thick.—Leight. Lich. TF]. ed. 3, p. 161. 
Physcia decipiens Arn. in Flora |. p. 562 (1867). Lecanora 
murorum subsv. decipiens Nyl. in Flora lii. p. 81 (note) (1869) ; 
Martind. in Naturalist 1887, p. 359; Cromb. Monogr. i. p. 359. 
Easicc. Johns. n. 256; Larb. Lich. Hb. n. 90 (as var. 
camboricum). 
Differs from Pl. murorum in the somewhat narrower lacinive and 
in the granular sorediate centre of the thallus. Nylander has 
