LECANORA] LECANORACE® 303 
Form efflorescens Cromb. Monogr. i. p. 438 (1894).—Thallus 
of minute scales on a dark hypothallus and sprinkled with pale- 
yellowish round soralia. Apothecia small, somewhat convex and 
usually immarginate. 
Crombie suggests that this unusual form may be due to the 
habitat. The hypothallus is formed of short-celled, very dark hyphe. 
Hab. On shaded stones of a schistose wall.—B. M. Craig Tulloch, 
Blair Athole, Perthshire (the only record). 
Var. stenotropa A. L. Sm.—Thallus effuse, thin, of yellowish- 
green granules. Apothecia rather small, convex, immarginate, 
yellowish ; spores thinner than in the species, about 7-12 p long, 
3-4 pw thick.—L. stenotropa Nyl. in Flora lv. p. 251 (1872); 
Cromb. in Grevillea xviii. p. 69 (1890) & Monogr. i. p. 440. 
A Scandinavian lichen which differs from the species in the 
slightly smaller thinner spores, otherwise not distinguishable. 
Hab. On schistose stones of a wall, associated with Lecidea 
leucophea.—B. M. Craig Tulloch, Blair Athole, Perthshire (the only 
British record). 
51. L. intricata Ach. Lich. Univ. p. 380 (1810).—Thallus 
limited or effuse, thickish and cracked-areolate, or composed of 
thin scales on a black hypothallus, whitish- or greenish-yellow or 
-brown (K + yellowish). Apothecia numerous, mostly small, 
adnate or semi-immersed, becoming convex, dull-flesh-coloured or 
brownish becoming olive or blackish, the thalline margin disap- 
pearing; paraphyses conglutinate, slender, rather wider and 
septate at the tips, the epithecium bluish-black ; spores oblong- 
ellipsoid, 9-15 pw long, 5-7 » thick.—Tayl. in Mackay FI. Hib. ii. 
p. 137 (incl. var. comminuta?) ; Leight. Lich. Fl. p. 198; ed. 3, 
p- 181. ZL. comminuta Tayl. in Lond. Journ. Bot. vi. p. 160 
(1847)? L. polytropa var. intricata Scher. Enum. p. 82 (1880) ; 
Mudd Man. p. 152; var. alpigena Mudd Man. p. 152 (1861) 
(non Ach.) ; subsp. intricata Nyl. in Flora lv. p. 251 (1872); 
Cromb. in Grevillea xviii. p. 69 & Monogr. i. p. 439. Lichen 
intricatus Schrad. Journ. Bot. v. p. 72 (1801) [Gottingen, 1802]. 
L. polytropus Sm. Engl. Bot. t. 1264 (two upper figs.) (1804) 
(non Ach.). 
Exsicc. Johns. n. 40; Leight. n. 153 ; Mudd n. 119. 
Closely allied to the preceding species, of which it is sometimes 
considered to be a variety or subspecies; it is distinguished by the 
darker more evident hypothallus, the darker apothecia, and the 
epithecium bluish-black in section. It is almost certain from the 
descriptions that Taylor’s L. comminuta belongs to this species. 
The hypothallus of both species and variety is formed of rather 
stout hyphe with a bluish-black tinge of colour recalling the some- 
what similar hypothallus of Placynthiwm nigrum. 
Hab. On rocks, boulders and walls, rarely on old palings, in 
maritime and mountainous districts.—Distr. Less frequent than the 
