ACOTYLEDONS. — LICHENS. ParmcUa. 53 



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



Lick. p. 200. Lichen parietinus, Ughtf. 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, ylch. 



Syn. Lich. p. 201. Lichen membranaceus, Dicks. PL Crypt, 

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

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

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



from any other. 

 S. P. plumbea, thallus orbicular b'ueish 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. 



Sj/n. Lich. p. 202. Lichen plumheus, Light/, p. 826. t. 2'6. 



f. 2. E. B.t. 353. 

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



roquhar and Inverary. 



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

 a blueisii grev J^pongy down, lobes of the circumference obtusely 

 notched elevated pale, apothecia plane crowded central red- 

 dish brown with tumid incurved cremdated whitish margins. 

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



Hab. Trunks of trees, often v/ith the last, Duke of Argyle's grounds 

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

 Hoolc. 



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

 dotted with black, beneath black and fibrillose, the segments 

 sinuato-multifid linear plane truncated crenate in the circum- 

 ference, apothecia dark brown the margin slightly crenulate. 

 Ach. Syn. Lich. p. 203. Lichen omphalodes, Light/, p. 818. 

 E. B. L 004. 



Hab. On rocks every where ; 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 ; then forming the paste into cakes, they dry 

 them in tb.e sun and preserve them for use. Liglilf. 



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

 neath black and fibrillose, the segments imbricated sinuated 

 plane subretuse, apothecia bright chesnut brown their margin 

 subcrenuiated. ykh. Syn. Lich. p. 204. Lichen saxatiiis. 

 Light/, p. S\6. E. B.t. mS. 



Hah. Stones and tnmks of trees, but not very common in fructification. 



12. r. Jahluiiensis, thallus orbicular ])itchy brown smooth, be- 

 uealli black and scarcely hbriilocjc, the segments sinuated 



