202 LICHENES. [Parmclia. 



brown with an inflexed notched or leafy border. — Ach. Syn. 

 p. 221. — Lichen speciosus, Wulf. — E. Bot. t. 1979. 



Upon rocks among mosses, at Ballacheulish, Scotland. Turner and 

 Hooker. — The fructification has not been found in Great Britain, but is 

 described from specimens, gathered in N. America. 



19. P. cycloselis, Ach. (orbicular dusky Parmelici); thallus 

 orbicular stellated glaucous brownish-green, cut into many im- 

 bricated nearly flat multifid retuse segments bearing white mealy 

 warts, beneath and at the margin black and fibrous, apothecia 

 brownish-black with an inflexed entire border. — Ach. Syn. 

 p. 216. — Lichen cycloselis, Ach. Prodr. — E. Bot. t. 1942. 



On trees and old pales, in England. — Walls and stones at Appin, 

 Argvleshire, Capt. Carmichael. 



20. P. virella, Ach. Meth. (little green imbricated Parmelid); 

 thallus membranaceous stellated greyish-green the segments flat 

 short lobed obtuse laciniated black and spongy beneath sprink- 

 led above with powdery warts and reddish lucid grains, apothe- 

 cia dark-brown with an even inflexed border. Sm — Lecanora 

 virella, Ach. Syn. p. 191. — Lichen virellus, Ach. Prodr. — E. 

 Bot. t. 1696. 



On trees and pales, in Sussex ; Mr. Borrer. —I do not see how this can 

 be separated from its very near affinity, P. cycloselis ; yet Acharius, in his 

 latest work upon Lichens, the " Synopsis," places them in different 

 Genera; Sir J. E. Smith even expresses a doubt how far the two are 

 really distinct as species. 



21. P. incurva, (incurved yellow-green ivarted Parmelici); 

 thallus stellated membranaceous pale yellowish-green bearing 

 yellowish powdery warts the segments much divided narrow 

 radiating convex incurved black and spongy beneath, apothecia 

 red-brown with an entire curved border. — Lichen incurvus, Pers. 

 —E. Bot. t. 1375 — L. multifidus, Dichs. Cr. Fasc. 3 p. 16. 

 t. 9./. 7. 



On rocks in Durham, Rev. Mr, Harriman. Scotland, Mr. G. Don. 



22. P. Fahlunensis, Ach. (flat black Bock Parmelici) ; thallus 

 orbicular pitchy-brown smooth the segments linear sinuated 

 flat or slightly grooved lacerated, beneath black and scarcely 

 fibrillose, apothecia dark-brown with a crenated border. — Ach. 

 Syn. p. 204. — Lichen Fahlunensis, Linn. — E. Bot. t. 653. — 

 Bill. Muse. t. 24. f. 81. 



Wales and Scotland ; on rocks on the more elevated mountains. 



23. P. stygia, Ach. (stygian Parmelici); thallus stellated 

 shining pitchy-black the segments linear multifid nearly palma- 

 ted convex with a few pale warts, beneath black with a few 

 radicles the margins and extremities decurved, apothecia of the 

 same colour at length black with a crenated border. — Ach. Syn. 

 p. 205. — Lichen styghis, Linn. — E. Bot. t. 2048. 



