LECANORA | LECANORACEE 297 
yellow (Kf + yellowish). Apothecia minute, scattered or con- 
gregate, the disc plane, becoming convex, flesh-coloured or 
brownish, slightly pruinose, the thalline margin thin, entire or 
subcrenulate, at first rather prominent ; paraphyses conglutinate, 
septate, scarcely widened upwards, with a thin epithecium of 
brown. granules ; spores oblong-ellipsoid, 8-12 » long, 3—4 p thick. 
—Cromb. in Journ. Bot. xi. p. 133 (1873) & Monogr. i. p. 455 ; 
Leight. Lich. Fl. ed. 3, p. 174. 
Exsicc. Cromb. n. 160; Leight. n. 176. 
Well characterized by the thin and generally arachnoid or finely- 
felted thallus and by the minute dainty apothecia, generally about 
*3 to ‘5 mm. in diameter. The pruinose character is difficult to see 
in such minute objects except under a strong lens. 
Hab. On trunks of fir trees, more rarely on old palings.—Dvstr. 
Rare in the British Isles, probably overlooked.—B. M. Millhill and 
Edgeware, Middlesex ; near Worcester ; Twyford, Shropshire ; Appin, 
Argyll; near Loch Tummel, Perthshire ; Maam, Connemara, Galway. 
Var. ochrostoma Koerb. 1. c.—Thallus similar to that of the 
species or almost obsolete. Apothecia generally numerous, 
becoming convex and the margin soon excluded, the disc more 
or less yellowish or rusty-red, not pruinose.—Leight. Lich. Fl. 
ed. 3, p. 174; Cromb. Monogr. i. p. 436. 
Differs from the species in the colour of the apothecia. In the 
few British specimens the thallus has practically disappeared. 
Hab. On old palings in wooded districts.—Distr. Rare in 8. and 
W. England.—B. M. New Forest, Hants; Braydon Forest, Wilts. 
Var. glaucella Koerb. 1. c—Thallus more evident, greyish- 
white. Apothecia bluish-grey-pruinose, the white thalline margin 
prominent, more persistent.—Subsp. glaucella Nyl. ex Cromb. in 
Grevillea xix. p. 60 (1891) & Monogr. i. p. 436. 
Ezxsicc. Johns. n. 264. 
Distinguished by the somewhat more developed thallus and by the 
darker pruinose apothecia. 
Hab. On bark of pine trees.—Distr. Rather rare in N. and N.W. 
England.—B. M. Bantsdale, Yorkshire ; Staveley, near Kendal, West- 
moreland; Ennerdale Lake, Cumberland. 
45. L. fugiens Nyl. in Flora lvi. p. 289 (1873).—Thallus 
effuse, thin, minutely granulate or obsolete, whitish-grey or -yellow 
(K + yellow, CaCl + orange). Apothecia minute, scattered, 
sessile, the disc dull-yellowish, the thalline margin whitish, 
prominent, entire or sometimes crenulate ; paraphyses slender, 
subdiscrete, septate, irregularly swollen and sometimes yellowish- 
brown above ; spores ellipsoid-oblong, 9-13 p long, 5—6 py. thick. 
—Cromb. in Grevillea ii. p. 89 (1873) & Monogr. i. p. 436 ; 
Leight. Lich. Fl. ed. 3, p. 184. 
Evidently a very rare lichen. The thallus is scarcely evident 
except in the specimen from Connemara. Nylander has regarded 
