8 
CRYPTOGAMIA. ALGAL Lichen. 
black. They are white within, and the crust greenish underneath, as in 
the 5th variety. Found by Mr. Griffith, on stones and walls near Bettws 
mountain, and near Garthewin, Denbighshire. 
L. canes'cens. Tubercles very black, not bordered, crowded: crust 
whitish with a glaucous tinge, spreading, rather leaf-like at the 
edge. 
Dicks. 2. 5— {E. Bot. 582. E.)— Dill. 18. 17. A. 
Crust circular, one to two inches diameter, pressed to, hoary, wrinkled, lobed, 
resembling small leaves cohering together, sprinkled in the centre with 
mealy globules. Saucers small, numerous in the centre, the margin blunt, 
of the colour of the disk. Being rarely found with saucers , it has been 
supposed to belong to the L. pallescens. Dickson. Has nothing in com¬ 
mon with L. pallescens. Mr. Woodward. Crust adhering very closely to 
the bark of trees, and the sides of walls, in circular patches from half to 
three inches over, ash-coloured, wrinkled, less wrinkled in the centre, 
rather leafy at the edge. Dill. 
L. incanus , Relh. ii. 846. L. canescens and L. canus of Gmelin. Syst. Veg. 
Under one name described as producing tubercles, under the other as 
bearing saucers. Mr. Dickson speaks of saucers, Mr. Relhan of tuber¬ 
cles. My specimens are tubercled. It may prove one of those Lichens 
which occasionally bears the one or the other. 
(Soft Mealy-crusted Lichen. E.) Walls and trunks of trees. Very 
common on old trees, but rarely in fructification. Mr. Woodward. 
About Garn, but chiefly on hawthorn. Mr. Griffith. (On old walls and 
trees near Gainford, Durham. Mr. Winch. E.) 
L. cjeruleo-ni'gricans. Tubercles blackish, not bordered; crust 
bluish. 
Dicks. H. S. — Hoffm. Lick. 32. 3— {E. Bot. 1139. E.)— FI. Dan. 1064.1. ( not 
Dill. 82. 2. as in Lightf.) 
Crust fixed to the earth, or to decayed mosses, composed of whitish ash- 
coloured granulations. Tubercles very irregular in shape, ash-coloured 
when young and small, blackish when old. 
(Black and Blue Lichen. Lecidea vesicularis. Achar. Hook. E.) Pa¬ 
tellar ia, vesicularis. Hoffm. L. candidus. Weber, and FI. Dan. On the 
Highland rocks, but not common. Lightf. 805. Norfolk and Suffolk. 
Mr. Woodward. (Cambridgeshire. Rev. Mr. Hemsted. On limestone 
rocks at Fawdon Slate ; and near Middleton, in Teesdale, Durham. Mr. 
Winch. E.) P. Jan.—Dec. 
L. ni'ger. Tubercles black, roundish, not bordered; crust black. 
( E. Bot. 1161. E.)— Hoffm. Enum. 3. 6. but the tubercles represented as if 
white. 
Crust granulated, hard, dry, very widely spreading. Tubercles convex, of 
the size of mustard seeds. Huds. In its young state the crust is thin 
and smooth. When more advanced the crust cracks, and the fructifica¬ 
tions begin to appear, but at first not raised above the crust, and not 
< asily to be distinguished from it. When older still the crust is very much 
cracked, the portions raised up, convex, granulated ; the tubercles very 
numerous, raised above the crust, convex, smooth. The specimens which 
gave rise to these remarks were eommunicated by Mr. Griffith, also 
another specimen which had grown in the shade, wherein the crust is thin 
and even, not black but blackish brown; the tubercles black with a 
