ACOTYLEDONS. LICHENS. Parmelia. 53 



the same colour as the crust their margin entire. Ach. Syn. 

 Lick. p. 200. Lichen pariei'mus, Lightf. p. 822. E. B. 1. 194. 

 HAB. On trees, walls, &c. abundant. 



7. P. lanuginosa, thallus orbicular yellowish white pulverulent, 

 greyish black and downy beneath, lobes imbricated plane 

 rounded slightly crenated, apothecia reddish (" of the same 

 colour as the crust," Dicks.) their margin pulverulent. Ach. 

 Syr?. Lich. p. 201. Lichen memlranaceus, Dicks. PL Crypt. 



fasc. 2. p. 21. t. 6.f. 1. 



HAB. On rocks lightly covered with earth, in the Highlands, Dicks. 

 This species is not taken up in Eng. Bot.,\)\it it appears very distinct 



from any other. 



8. P. plumbea, thallus orbicular blueish grey, beneath having a 

 very thick spongy down, the lobes of the circumference 

 rounded and crenale, apothecia scattered at length convex 

 rusty brown their margin of the same colour and entire* Ach, 

 Syii Lich. p. 202. Lichen plumbeus, Lightf. p. 826. t. 26. 



f.2. E. B.t.35'3. 



HAB. Trunks of trees, not unfrequent in the Highlands, as at Ar- 

 roquhar and Inverary. 



9. P. ruliginosa, thallus orbicular brownish grey, beneath having 

 a blueish grey spongy down, lobes of the circumference obtusely 

 notched elevated pale, apothecia plane crowded central red- 

 dish brown with tumid incurved crenulated whitish margins. 

 Ach. Syn. Lich. p. 202. Lichen affi.nis, E. B. t. 983. 



HAB. Trunks of trees, often with the last, Duke of Argyle's grounds 

 at Inverary, and on the sides of Loch Lomond, Mr. Turner and 

 Rook. 



10. P. omphalodes, thallus orbicular dark purplish brown shining 

 dotted with black, beneath black and fibrillose, the segments 

 sinuato-multind linear plane truncated crenate in the circum- 

 ference, apothecia dark brown the margin slightly crenulate. 

 Ach. Syn. Lich. p. 203. Lichen omphalodes, Lightf. p. 818. 

 E. B. t. 604. 



HAB. On rocks every where j abundant on the dry stony moors. 



This is much used by the Highlanders in dyeing a reddish-brown co- 

 lour. They steep it in urine for a considerable time till it becomes 

 soft and like paste 5 then forming the paste into cakes, they dry 

 them in the sun and preserve them for use. Lightf. 



11. P. saxatilis, thallus orbicular greyish rough and pitted be- 

 neath black and fibrillose, the segments imbricated sinuated 

 plane subretuse, apothecia bright chesnut brown their margin 

 subcrenulated. Ach. Syn. Lich. p. 204. Lichen saxatilis, 

 Lightf. p. 816. E.B. t. 603. 



1 1 AB. Stones and trunks of trees, but not very common in fructification. 

 1'2. P. fahlunensis, thallus orbicular pitchy brown smooth, be- 

 neath black and scarcely fibrillose, the segments sinuated 



