14 
CRYPTOGAMIA. ALGAL Lichen. 
mealy edges. Dicks. The greenish brimstone colour of the crust is not 
permanent. 
(Scarlet Lichen. E.) On the stones of Stone Henge, Wiltshire. (On 
sandstone in Roslin wood. Mr. Brown. On the walls of Muggleswick 
Park, and on whin rocks and old trees near the High Fofce, in Teesdale, 
Durham; on walls between Catherston and Ronaldkirk, Yorkshire. 
Mr. Winch. E.) 
B. (3) Crustaceous, with Saucers. 
L. coralTinus. Saucers white, very minute : crust forming cylindri¬ 
cal level-topped bundles ; the extreme edge rather leaf-like. 
Hoffm. Enum. 4. 2— Jacq. Coll. ii. 13. 2.—( E , Bot. 1541. E.) 
Similar to L. calcareus. Crust very thick, and when broken appearing 
composed of threads resembling coral; the ends rounded, without tuber¬ 
cles. Linn. Crust thick, white, broad spreading on the rocks, appearing 
as if composed of small branches, and when broken the branches appear 
distinctly, their tops forming the surface of the crust. Tubercles only on 
the old specimens, hardly visible to the naked eye, a little hollowed. 
Besides these tubercles there are minute convex black dots on the crust. 
Weber. Crust a line in thickness, snow white, greyish with age, bear¬ 
ing on its surface little pillars like coralline, half a line high, convex at 
the ends. Jacq. Coll. ii. 180. 
(White Coral-crusted Lichen. Isidium corallinum. Achar. Hook. E.) 
Rocks, stony places, and mountainous heaths in Wales, the north of 
England, and in Scotland. P. Jan.—Dec. 
L. perel'lus. Saucers white, mealy, with yellowish white, thick, 
blunt borders: crust yellow white. 
Dicks. H. S. — Hoffm. Enum. 6. 2— Dill. 18. 10— Hoffm. Lich. i. 12. 5— {E. 
Bot. 727. E.)— Pet. Musc.f. 79. 
Crust thick, warty, white in its fracture, reddish when wet and rubbed to 
powder. Saucers numerous, whiter than the warts, globular but de¬ 
pressed in the centre, larger and flatter with age. Hoffman. Crust 
wrinkled, granulated, stony to appearance, not gritty when chewed, 
but rather tough; yellowish when cut. Saucers like crabs’ eyes, 
whitish. Dill. 
(Crabs’-eye Lichen. Lecanora perellus. Achar. Hook. E.) Rocks, walls, 
stones, trunks of trees. Malvern Hills, Worcestershire. St. On the 
smooth bark of a beech in Hertfordshire. Mr. Woodward. Saltash 
Ferry, near Plymouth, on slate, in great quantity. P. Jan—Dec.* 
L. crenula'tus. Saucers grey; border whitish, broad, scolloped: 
crust black, rough. 
Dicks. 9. 1.— (E. Bot. 930. E.) 
Crust thin, wrinkled, black; Saucers numerous, scattered, small: border 
very broad. 
* Litmus is prepared from this species. For this purpose it is gathered from the 
rocks in the north of England, and sent to London in casks. (In the south of France, 
where it is employed as a crimson or purple dye, in lieu of L. tartareus , it is called 
per die d' Auvergne, whence the specific name, according to Smith. E.) 
