PLACODIUM | PHYSIACEE 199 
Var. brevilobatum A. L. Sm.—Differs from the species in 
the reduced thallus, the lobes of the circumference being short, 
rather scattered or absent, the centre cracked-areolate or verru- 
cose. Apothecia and spores as in the species.—Lecanora brevi- 
lobata Nyl. in Flora lxvi. p. 99 (1883).  Lecanora callopisma 
subsp. sympagea var. brevilobata Cromb. Monogr. i. p. 563 (1894). 
Hab. On schistose rocks in maritime and inland districts.—Distr. 
Very rare in N.W. England and N.E. Scotland.—B. M. Near Alston, 
Cumberland ; Portlethen, Kincardineshire, 
3. Pl. flavescens A. L. Sm.—Thallus orbicular, closely adnate, 
bright-yellow, shining, pruinose or naked, the lobes of the circum- 
ference narrow, turgid, crenulate (K + purplish). Apothecia 
concolorous or brownish-red, the margin entire, disappearing ; 
spores very wide at the septum, lemon-shaped, 8-14 yp long, 
6-10 » thick.— Pl. callopismum var. plicatum Leight. Lich. FI. 
p- 177 (1871); ed. 3, p. 163. Lichenoides crustosum, orbiculis et 
scutellis flavis Dill. Hist. Muse. p. 136, t. 18, fig. a. Lichen 
Alavescens Huds. Fl. Angl. p. 445 (1762) pro maj. parte. Amphi- 
loma Heppianum Miill.-Arg. in Mém. Soc. Phys. Hist. Nat. Gen. 
xvi. p. 379 (1862). Lecanora murorum var. plicatum Wedd. in 
Bull. Soc. Bot. Fr. xvi. p. 200 (1869). L. callopisma var. 
sympagea Nyl. in Bull. Soc. Linn. Norm. sér. 2, vi. p. 304 (1872) 
(non Ach.) ; subsp. sympagea Cromb. in Grevillea xviii. p. 45 
(1889) & Monogr. i. p. 362. 
Hesec, Johns. n. 31; Larb. Lich, Hb. n. 15; Mudd 
nos. 94, 96. 
Closely allied to the preceding, there being slight connecting 
stages though distinct in the extreme forms, in which the lacinie 
are turgid and convex like those of Pl. mwroruwm. Two other names 
have been used for the plant, based on Lichen awrantius Pers. 
{Ust. Ann. Bot. xi. p. 14 (1794) ), and L. sympageus Ach. (Lich. Suec. 
Prodr. p. 105 (1798) ), but both those plants are probably only forms 
of Pl. callopismum, as the laciniz are described as plane. 
The Dillenian description refers to four species, which have been 
verified after examination as follows:—those under fig. 184 are 
Pl. flavescens; under 188 Pl, citrinwn and Candelaria concolor ; 
under 18c¢ Pl. murorum, 
Hab. On rocks and mortar of walls, chiefly in maritime, but also 
in inland districts.—Distr. Not uncommon throughout the British 
Isles.—B. M. Vale Castle, Guernsey; Alderney; St. Austell and 
St. Maws, Cornwall; Torquay and North Lynton, Devon; near Ryde, 
I. of Wight; Glynde and Peasemarsh, Sussex; Manorbeer, near 
Tenby, Pembrokeshire ; near Southerndown, Glamorganshire ; Aber- 
dovey, Merioneth; Llanymynech Hill, Shropshire; Buxton and 
Cromford, Derbyshire; Bilsdale, Cleveland, Yorkshire; near Hartle- 
pool, Durham; Arnbarrow, Westmoreland; St. Bees, Cumberland ; 
I. of Lismore and Barcaldine, Argyll; West Water, Fifeshire; Blair 
Athole, Perthshire; Portlethen, Kincardineshire; near Aberdeen; 
Dunkerropn, Kerry ; Cleghan, Connemara, Galway; Castlebar, Mayo. 
