PARMELIA.] PARJIRLTEI. 2"».') 



Var. /5. laetevirens Xyl. ]'>iill. Soc. Linn. Norraaiid. vi. 1^7.;, 

 p. 272. — Thalliis orbicular or effuse, greenish-olive or greeriisti- 

 brown, more or less coverefl with eoncolorous i:«idia (mefliilla (!aCl + 

 red). Apothecia and spores as in the type. — Cromb. Greviliea, x. 

 p. 26. — Imhricar'm olivacea y. laetevirens Flot. Lich. 8il. (1S2!)) 

 n. 90. Furmelia faVifjinom f. olivacea Leight. Lich. Fl. ed. 3, p. 12:}. 

 Pannelia Borreri f, olivacea Leight. Lich. Fl. ed. 2, p. 479. 



Though diffeiing in the colour of the thallus and of the ii?idia, the 

 reaction of the uu'didla shows that this is only a variety of P. fuUfjinoHa. 

 States occur in which there is scaix-ely auy trace of isidia (form (Jcnudata 

 Cromb., probably referable tosubsp. ijkihratula Lamy, as in Grevillea, xv. 

 p. 75). In herbaria specimen.-- the isidia often become abraded, rendering 

 the thallus white-punctate. The apothecia are not uncommon, but the 

 spermogones are rarely seen. 



Hah. On old trees and pales, rarely on walls, in maritime and upland 

 districts. — Uistr. Local and scarce in E. and X. England, X. Wales, the 

 Highlands, Scotland, and X.W. Ireland. — 13. M. : Ilopton, Suffolk; 

 Bettws-y-Coed, Denbighshire ; near Dolgelly and lUiewgreidden, 3Ierio- 

 nethshire ; Devil's Bridere. Cardiganshire ; Kendal and l^evens Park, 

 "Westmoreland : Keswick, Cumberland. Appin and head of Loch Awee, 

 Argvleshire ; Loch Ard and Glen Lochay, Perthshire ; Durris, Kincar- 

 dineshire ; Morrone, Braemar, Aberdeenshhe. Derryclare and near Kyle- 

 more, CO. Galway. 



26. P. stygia Ach. :5treth. (1803) p. 203.— Thallus orbicular, 

 appressed, somewhat shining, smooth, imbricate, olive-brown or 

 blackish ; beneath pitch-black, paler at the margins, with but few 

 rhizinse ; lacinise subliuear, palraato-multifid, convex, incurved at the 



apices (K~,CaCl~). Apothecia moderate or somewhat large, sub- 



concolorous, the margin grannlato-crenate ; spores 0,008-10 mm. 

 long, 0,006-7 mm. thick. — Gray, X^at. Arr. i. p. 4-11 ; Hook. Fl. 

 Scot. ii. p. 54 ; Sm. Eng. Fl. v. p. 202 ; Mudd, Man. p. 100 ; Cromb. 

 Lich. Brit. p. 35 ; Leight. Lich. Fl. p. 124, ed. 3, p. 116.— 

 TJclien st>/r/ius Linn. 8p. PL (1753) p. 1143 ; Dicks. Crypt, fasc. iii. 

 p. 16 ; With. Arr. ed. 3, iv. p. 30 ; Eng. Bot. t. 2048.— ^/-iV. Res. : 

 Dicks. Hort. Sic. n. 25 pro parte. 



Somewhat resembles Plafi/sma Fahlunense, but distinguished by the 

 form of the lacinife, the character of the spermogones, and the absence of 

 meduUarv reaction with K. It is generally fertile, though the apothecia 

 are rather scattered and not numerous. The spermogones, which are 

 frequent, are immersed, Avith spermatia 0,005 mm. long, 0,001 mm. thick, 

 constricted in the middle and somewhat obtuse at the apices. 



Hub. On rocks and boulders, granitic and quartzose, in subalpine and 

 alpine regions. — I)ktr. Local and rare, being confined to a few of the 

 higher Grampians, Scotland. — B. M. : Ben More, Perthshire ; Lochnagar, 

 Ben-naboord and Ben Macdhiu, Braemar, Aberdeenshii-e ; Ben Xevis, In- 

 verness-shire. 



27. P. alpicola Fr. fil. X'ov. Ac. Beg. Soc. Sc. Cpsal. (1861) 

 p. 157. — Thallus orbicular or expanded, somewhat appressed and 

 adnate, subopa'jue, blackish- olive or dark-grey; beneath very black, 



