360 LICHENACEI. [LECANORA. 
rather narrow, imbricate. Apothecia small, the thalline margin 
entire, or at length subcrenate ; spores ellipsoid or oblongo-ellipsoid, 
often somewhat curved, 2-locular (with K polari-bilocular), 0,010-16 
mm. long, 0,004-8 mm. thick.—Martind. Naturalist, 1887, p. 359. 
—Physcia decipiens Arn. Flora, 1866, p. 529, 1875, p. 153, t. v. 
figs. 2, 3.—Placodium decipiens Leight. Lich. Fl. p. 176, ed. 3, 
p- 162, refers chiefly to the following subspecies. 
Characterized by the central thalline verruca, the narrower radii, and 
more especially by the spores, the true structure of which, however, as 
in many other instances, becomes apparent on the application of K. The 
typical condition here described, represented by Arnold’s Lich. Exs, 
n. 445, may, as suggested by Nylander (Flora, 1883, Z. c.), be the original 
Lichen murorum of Hoffmann. In the very few British specimens seen, 
the apothecia are few and not well developed. The spermogones, how- 
ever, are more frequent with spermatia oblongo-bacilliform, 0,030-25 
mm. long, 0,0007-Y mm. thick. It is, as noted by Martindale, J. c., a 
somewhat variable plant, and the specimens (well fertile) issued by 
Larbalestier (s. n. var. camboricum Larb.) are referable to a state in 
which the thallus becomes effuse, or nearly so, the peripheral lobes being 
very irregularly produced. 
Hab. On walls in lowland districts.—Distr. Local in 8., W., and E. 
England.—B. M.: Shoreham, Kent; near Cirencester, Gloucestershire ; 
Milton Church, Cambridgeshire. 
Subsp. 2. L. tegularis Nyl. Flora, 1883, p. 106.—Thallus some- 
what small, short, plicato-radiate at the circumference, diffracto- 
areolate in the centre, naked or suffused, vitelline, pale-yellow, or 
miniate. Apothecia small, concave, then plane, concolorous or sub- 
concolorous with the thallus, the thalline margin entire ; spores as in 
the type, or occasionally somewhat smaller (0,009-0,011 mm. long, 
0,0035-45 mm. thick).—Cromb. Grevillea, xviii. p. 44.—Lichen 
teqularis Ehrh. Exs. n. 304 (1785). To miniate states are referable 
pro parte Squamaria miniata Sm. Eng. Fl. ii. p. 195. Placodium 
murorum y. miniatum Mudd, Man. p. 132; Cromb. Lich. Brit. 
p. 45; Leight. Lich. Fl. p. 175, ed. 3, p. 162 (ut sp. propr.). 
Lichen elegans Eng. Bot. +. 2181 (two left-hand figs.).—Brit. Ews.: 
Leight. n. 207; Mudd, n. 95; Larb. Lich. Hb. n. 51. 
A smaller and rather variable plant, distinguished from the type and 
the preceding eubenes with both of which it is subconfluent, by the 
characters given. The thallus is at times somewhat scattered with the peri- 
pheral radii little distinct. It is always well fertile, the apothecia being 
numerous and varying in colour like the thallus. The spermogones have 
the spermatia either as in the type or a little smaller (0,002-3 mm. long, 
0,0007-8 mm. thick). It is to vermilion-coloured states that the trivial 
name miniata (Hoffm.) has more especially been applied; but as other 
species growing in dry and exposed habitats, especially calcareous, have 
similarly coloured thalli, the name cannot with propriety be used either 
in a specific or varietal sense. 
Hab. On rocks and walls, very rarely on old timber, from maritime to 
upland situations.—Distr. Here and there throughout Great Britain; 
rave in the Channel Islands; not seen from Ireland—B. M.: Rozel, 
