CRYPTOGAMIA. ALGAE. Lichen. B.\(2) Crustaceois, 
with TUBERCLES. 
thickly set with very small sub-sphzroidal tubercles, of a grey 
white colour. Jaca. Crust either blue grey, black or white, or 
rather, the properscrust 'is black, but this is very thin, very 
closely adhering, not always present, and then its place is some- 
times supplied-by-the outer grey. coat of the tubercles spreading 
- upon the stone... Tubercles black, but before the crust which 
envelopes them breaks open. they appear grey ;. border none. 
_ Onrocks.. [On flints in the:Isle.of Wight.] P, Jan.—Dec. 
Var. 2. Tubercles both black and white; border none. 
Such is the case with specimens which Mr, Relhan and Mr. 
Dickson favoured me with. Linnzus seems, in his different 
works, to have described both these under the name atro-albus. 
I find no figure of this 2d variety, This grows upon peat earth 
as well as upon rocks, 
L, Tubercles black, plaited and wrinkled, of different sim’plex. 
_ shapes: crust none. _. ee 
= one 3ant Die, Tr. ii. BEL! Bie OA» : 
_ Has no ‘ground or crust, but consists of small tubercles which 
in the microscope appear wrinkled, and of various irregular 
forms. Not L. ashe: of Gmel. syst. veg. ti? . 
It grows upon a kind of grey slate, which it covers to the 
extent of many inches together. I have also found it on sand 
_ Stone. Rev, Hugh Dayies in Linn, tr, ii. 283. 
L. Tubercles black, not bordered ; crust clear white. calca’reus. 
Ws erg i Ae, ey fe ase F 
Hard, stony, firmly fixed to the rocks, gritty when chewed, 
rather rough, cracked, set with minute white eminencies, white 
within, thickness of half a straw’s breadth. Tubercles rarely 
found, scattered, black, not bordered. Diu. black within, which 
distinguishes it from the L. sanguinarius. ; 
___ On most of the rocks of Glyder mountain, Caernarvonshire. 
Dit. © On limestone rocks in the north of England and Wales, 
Hups. On the Pentland Hills. Licurr. On old walls. Retx. 
. Jan.—Dec.* 
"crust white. Dae 
Hoffm. lich. i. 2; 2 to 4-E, ‘bat. 193, 
L. Tubercles black, immersed as it were in the stone ; immer’sus. 
® This. species is fo peculiar to limestone rocks, that wherever that 
Stone occurs ainong others, ‘it may be distinguished at the first view by 
this plant growing upon it. When dried, powdered, and steeped in urine, 
it is used to dye scarlet, by the Welsh and the inhabitants of the Ork- 
neys. The colour is said to be very fine. Steere 
