16 
CRYPTOGAMIA. ALGAE. Lichen. 
L. concen'tricus. Saucers blacky confluent, placed in concentric cir¬ 
cles, imbedded in the crust: crust greyish white. 
( Hoffrn. Lich. 50.1. 2. E.)— E. Bot. 246— Jacq. Coll. in. 6. 2. a. a. a. 
Saucers generally with a white border, somewhat raised above the crust. 
(Concentric Lichen. E.) Found by the Rev. Hugh Davies on whin- 
stone rocks in the parish of Whitford, Flintshire. See E. Bot. and Trans. 
Linn. Soc. ii. p. 284. On a wall between Bettws mountain and Garthe- 
win, the seat of Robert Wynne, Esq. Denbighshire; on schistus. Mr. 
Griffith. (On rocks in Heaton Dean, Northumberland; on sandstone 
near Eglestone, and on the same material in the neighbourhood of Gain- 
ford ; also on rocks in Cawsey Wood, Durham. Mr. Winch. E.) 
L. puncta'tus. Saucers black, very numerous, small, roundish: crust 
grey, cracked. 
{E. Bot. 2243. 
Crustaceous, cracked, warty, cream-coloured, with a thin, smooth, white, 
evanescent edge. Tubercles minute, black, with a sooty uneven border. 
Little-dotted Lichen. L.microsticticus. Isidium microsticticum. Achar. 
Hook. On slate, rocks on the hills about Hafod, Cardiganshire. E. 
Bot. E.) On rocks in Scotland. Dicks, iii. 15. 
L. scrupo'sus. Saucers black, sunk in the crust: scolloped at the edge: 
crust ash-coloured, granulated. 
Hoffm. Lich. 11. 2— E. Bot. 266— Jacq. Coll. ii. 13. 3— Hall. Enum. 2. 6. 
at p. 91— Hist. 47. 6. at iii. p. 88— Dill. 18. 15. B — Hoffm. 6. 1— Mich. 
52. ord. 33. 
Crust when moist greenish ash-coloured, when dry greyish. Mr. Woodward. 
Crusty, thick, cracked, warty, grey; whitish when thinner, brittle when 
dry. Saucers sunk in the crust, hollow, lead-coloured. Hoffm. 
(Excavated Lici-ien. E.) L. pertusus. Jacq. Coll, on the authority of 
Dr. Smith. L. excavatus. Relh. p. 420. Walls and dry heaths, Gog- 
magog Hill, Newmarket Heath. On walls, frequent, Norfolk and Suf¬ 
folk. Mr. Woodward. (Near Egleston, Durham. Mr. Winch. E.) 
Var. 2. Crust widely expanded, thicker. Relh. 
On walls. (On the ground on the banks of Leith Water, Edinburgh. Mr. 
Brown. E.) 
L. frustulo'sus. Saucers brown black : crust black and white varie¬ 
gated. Dicks. 
(E. Bot. 2273. E.)— Dicks. 8. 10. 
Crust composed of two layers, the under one wrinkled, black, spreading 
widest: the upper white, even, occupying the central part, cracked into 
irregular pieces. Saucers numerous, on the pieces of white crust ; very 
pale brown and flat when young and bordered with white; when older 
darker coloured and swollen into tubercles; when old black and rather 
confluent. Dicks, iii. 13. 
(White-scaled Lichen. Lecanora frustulosa. Achar. Hook. E.) Rocks 
in Scotland, and in Yorkshire. (On tiles and roofs of houses in Gainford, 
Durham. Mr. Winch. E.) 
L. atrocine'reus. Saucers black, much crowded, flat, border grey: 
crust black. 
Dicks. 9. 2. 
