LECANORA. ] LECANO-LECIDEET. 455 
ii, p. 49; Sm. Eng. Fl. v. p. 190; Tayl. in Mack. Fl. Hib. ii. 
p. 186; Cromb. Lich. Brit. p. 57; Leight. Lich. FI. p. 232, ed. 3, 
p. 224. Rinodina hematomma et R. porphyria Gray, Nat. Arr. 
i, p. 457.—As the specimens published by Dickson are suffi- 
ciently typical, his specific name has priority.—Brit. Ews.: Dicks. 
Hort. Sic. n. 24; Leight. n. 214; Mudd, n. 180; Larb, Lich. Hb. 
n. 339; Bohl. n. 120. 
The thallus spreads very extensively and varies somewhat in thickness 
and.colour. In some other countries it occurs on the trunks of aged 
trees, but it has not with certainty been found upon such in Great 
Britain ; though what may be the sterile thallus has been noticed spar- 
ingly on oaks in the New Forest. The apothecia are numerous, though 
somewhat scattered, with the thalline margin often obliterated. The 
spermozones, which are very minute, scattered, and slightly prominent, 
might readily be mistaken for very young apothecia, with which they are 
concolorous, 
Hab. On shaded perpendicular rocks and boulders in maritime and 
upland districts—Distr. Probably general and common in Britain and 
the Chanuel Islands, as also in Ireland; but from the nature of the 
habitat specimens are with difficulty obtained—B. M.: Rozel, Island of 
Jersey; Islands of Guernsey, Brechou, and Alderney. Withyam and 
Ardingley, Sussex; near Penzance, Cornwall; Stonehenge, Wiltshire ; 
Acton Burnell and Nesscliff Hill, Shropshire; Moel-y-yolfa, Montgo- 
meryshire; Barmouth, Merionethshire; Nant Francon, Carnarvonshire ; 
Battersby, Cleveland, Yorkshire; near Eglestone, Durham; Harlaw 
Hill, Northumberland. Roslin, near Edinburgh ; Bowling Bay, Dumbar- 
tonshire; Airds, Appin, Argyleshire; West Water, Fife; The Trossachs 
and Craig Calliach, Perthshire; Portlethen, Kincardineshire ; Morrone, 
Braemar, Aberdeenshire ; Glen Nevis, Inverness-shire. Near Belfast, 
co. Antrim; Western Blasquet Island, co. Kerry. 
Var. 8. saxetana Cromb. Grevillea, xviii. (1890) p. 70.—Thallus 
subcontinuous, thickish, white or whitish. Apothecia sessile, con- 
vex, dark sanguineous ; the thalline margin obliterated.—Lecanora 
hematomma torm saxetana Cromb. Lich. Brit. p. 58. Lecidea 
saxetana Ach. Vet. Ak. Handl. 1808, p. 269. 
Distinguished by the less pulverulent, constantly whitish thallus and 
by the darker biatoroid apothecia. It seems a distinct variety rather than 
a state of the so-called variety porphyria (Pers.), into which the type 
passes in certain situations. 
Hab. On the side of an exposed perpendicular rock in an upland dis- 
trict.—Distr. Only very sparingly on one of the N. Grampians, Scotland. 
—B. M.: Morrone, Braemar, Aberdeenshire. 
151. L. elatina Ach. Lich. Univ. (1810) p. 387.—Thallus effuse, 
thin, granulato-leprose, whitish or pale-yellowish (K-+yellow, 
CaCl—). Apothecia moderate, sessile, brownish-testaceous (K—), 
at first somewhat plane with thin entire thalline margin, then 
convex and biatorine ; spores fusiformi-acicular, 3-5-septate, usually 
