PARMELIA. | PARMELIFL. 257 
usually almost simple and spermatia 0,006-7 mm. long, 0,001 mm. thick, 
slightly subacute at the apices. 
Hab. On rocks and boulders, very rarely on gravelly soil, in subalpine 
and alpine localities—Distr. Local and scarce in 8.W. and N. England 
and in N. Wales; more frequent on the Grampians, Scotland; rarer in 
W. Ireland.—B. M.: Dartmoor Tors, Devonshire; Cader Idris, Merion- 
ethshire; Snowdon, N. Wales; Teesdale, Durham. New Galloway, 
Kirkeudbrightshire ; Ben More, Mael Girdy, and Ben Lawers, Perthshire ; 
Clova Mts. and Katelaw, Forfarshire ; Loch Phadrig, Lochnagar, Mor- 
rone, Cairngorm, and Ben-naboord (frt.), Braemar; Ben Nevis, Inver- 
ness-shire; Hills of Applecross, Ross-shire. Mangerton, Killarney, and 
MacGillicuddy’s Reeks, co. Kerry; Doughbruagh Mts., Connemara, co. 
Galway. 
Var. 6. reticulata Cromb. Grevillea, xii. (1884) p. 72 —Thallus 
orbicular or suborbicular, closely appressed, black or blackish, opaque; 
branches short, slender, very much entangled, subimbricate, dicho- 
tomously reticulate, shortly furcate at the apices. Apothecia con- 
colorous, with the margin often ciliate.—Lichen reticulatus Wulf. in 
Jacq. Coll. ii. (1788) t. 9. ff. 6, 7. Alectoria lanata var. parmelioides 
Cromb. Journ. Bot. 1872, p. 233; Leight. Lich. Fl. ed. 3, p. 81 
(inel. var. subciliata). Parmelia lanata var. subciliata Nyl., Cromh. 
Lich. Brit. p. 35 ; Leight. Lich. Fl. p. 125. Lichen pubescens Huds. 
Fi. Angl.ed. 2, p. 132; Lightf. Fl. Scot. ii. p.893; With. Arr. ed. 3, 
iv. p. 48. Coralloides tenuissimum nigrescens, mundi muliebris instar 
tectum Dill. Muse. 113, t. 17. f. 32.— Brit. Evs.: Cromb. n. 20. 
A well-marked variety, which in its normal condition with its parme- 
lioid habit looks like a distinct species. Transition states, however, exist, 
and old plants gradually assume more of the characters of the type. The 
thallus, which is aptly compared by Dillenius to “ black lace,” occasionally 
becomes centrifugal. It is not uncommon in a fertile condition, the apo- 
thecia being usually numerous, with the margin often ciliate with spinu- 
liform papillee. 
Hab. On quartzose rocks and boulders in alpine localities. — Distr. Con- 
fined to some of the higher Grampians, Scotland, where it is plentiful — 
B.M.: Ben Lawers, Perthshire ; Clova Mts., Forfarshire ; Morrone, Glen 
Callater, Cairngorm, and Glen Candlic, Braemar, Aberdeenshire. 
29. P. tristis Nyl. Act. Soc. Linn. Bord. sér. 3, i. (1856) p. 304; 
Flora, 1872, p. 548.—Thallus crespitoso-fruticulose, cartilaginous, 
erect, rigid, somewhat roundly compressed, sparingly distichously 
branched, pitch- or brownish-black ; branches subfastigiate, at- 
tenuate (K—, CaCl_). Apothecia plano-convex, moderate, sub- 
concolorous, the margin entire or fimbriate; spores 0,008-11 mm. 
long, 0,004-6 mm. thick.—Cromb. Grevillea, xii. p. 71.—Platysma 
triste Cromb. Lich. Brit. p. 26; Leight. Lich. Fl. p. 99, ed. 3, p. 94. 
Cornicularia tristis Gray, Nat. Arr. i. p. 404; Hook. Fl. Scot. ii. 
p. 69; Sm. Eng. FI. v. p. 228; Tayl. in Mack. Fl. Hib. ii. p. 86; 
Mudd, Man. p. 76. Lichen tristis Web. Spicil. (1788) p. 209 ; 
With. Arr. ed. 3, iv. p. 43; Eng. Bot. t. 720. Lichen radiatus 
Huds. Fl. Angl. ed. 2, p. 559. Lichen corniculatus Lightf. Fl. Scot. 
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