acotyledons. — LICHENS, Parmelki. 55 



ments in the circumference distinct plane rounded waved in- 

 clso-crenate, apothecia plane reddish brown their margin at 

 length crenulate and pulverulent. Ach, Sijn. Lick. p. 2Q8. 

 Lichen aleurites, E. B. i. 858. 

 Hab. Trunks of trees, posts, rails, &c. 



19. P. nmbigiia, thallus stellated pale yellow green smooth bear- 

 ing powdery warts, beneath brownish black and fibrillose, the 

 segments linear appressed plane dichotomous somewhat trun- 

 cated, apothecia suhcenlralsmall nearly plane brown their margin 

 entire. Ach. Syn. Lich. p. 208. Loharia mnbigua, Hoffm. 

 PL Lich. t. 40. f. 2—4, and t. A2.f. 2, 3 (P. sona). 



Hab. Trunks of fir trees in the Highlands, about Cairngorum, Mr. 

 Boner and Hook. Bark of firs about Kinnordy, Kerrie-muir, al- 

 ways barren. 



20. P. coiispersa, thallus orbicular greenish yellow smooth with 

 blackish dots, brown and fibrillose beneath, the segments si- 

 nuato-lobate rounded crenate nearly plane, apothecia central 

 chesnut brown vvitli the margin nearly entire. Ach. Syn. 

 Lich. p. 209. Lichen centrifagus, Lighlf. p. 814. Lichen 

 conspersus, E. B. t. 2097. 



Hab. Rocks, common. 



21. P. speciosa, thallus stellated glabrous greenish white, berieath 

 snowy white with greyish hbres, the segments imbricated linear 

 plane cut and branched crenate their extremities ascending and 

 powdery, apothecia central brown with a tumid singularly 

 rough and crenate border. Ach. Syn. Lich. p. 211. Lichen 

 speciosus, E. B.t. 1079. 



Hab. In a wood between Ballacheulish and Linnhe Loch, Mr. Turner 

 and Hook. 



22. P. IcBuigata, thallus stellate smooth greyish white, beneath 

 black and fibrillose, the segments multifid linear broader up- 

 wards cut divaricated acute in the circuujference frequently 

 bearing powdery warts, apothecia concave chesnut colour with 

 the margin entire. Ach. Syn. Lich. p. 212. Lichen Iceui- 

 gatus, E. B.t. 1852. 



Hab. On trees in Ross-shire, Mr. Borrer and Hook. 



23. P. pulverulenla, thallus stellated deep glaucous green ceesious 

 and pruinose when dry, beneath black and downy and hispid, 

 the segments linear multifid in the circumference plane ap- 

 pressed waved retuse at the extremities, apothecia glaucous 

 black the margin entire and waved at length leafy. Ach. Syn. 

 Lich. p. 214. Lichen pulverulenlus, E. B. t. 2063. L. stel- 

 laris,^. Lighlf. p. 824. 



Hab. Very common on the trunks of trees. 



24. P. sielluris, thallus stellated at length rugged and granulated 

 greyish green, beneath with grey fibres, the segments sublniear 



