So 
PLATYSMA. | CETRARIET. 227 
Form 2. ampullaceum Cromb. Linn. Soc. Journ. Bot. xvii. 
(1880) p. 572.—Thallus vesiculoso-inflated either towards the 
apices of the lacinim, or here and there throughout. Apothecia 
never seen.—Lichen ampullaceus Linn. Sp. Pl. (1753) p. 1146; 
Huds. Fl. Angl. p. 450; With. Arr. ed. 3, iv. p. 61. Lichenoides 
tinctorium glabrum vesiculosum Dill. Muse. 188, t. 24. f. 82. L- 
chenoides saxatile tinctorium foliis latioribus non pilosis, vesiculas 
proferens Dill. in Ray, Syn. ed. 3, p, 74, n. 71. 
A monstrosity, caused by the presence of the parasite Abrothallus 
Smithii. The portions of the laciniee which are the host become more or 
less bullato-inflated (var. buddata Scher. Enum. p. 13). These “ inflated 
vesicles” were mistaken by Dillenius and older authors for apothecia. 
Hab. On shady rocks in upland situations.— Distr. Local and scarce in 
N, England (where it was originally detected near Coln, in Lancashire), 
and among the N. Grampians.—B. M.: Craig Cluny, Braemar, Aber- 
deenshire. : 
Var. 3. tenuisectam Cromb. Grevillea xv. (1886) p. 49.—Thallus 
dark-glaucous or brownish-black above, blackish beneath; laciniee 
short, narrow, much divided and crowded. 
A distinct variety, presenting a panniform aspect. The darker colour 
of the thallus is probably owing to the habitat. It is seen only ina 
sterile condition. 
Hub. On exposed boulders in mountainous regions.—Distr. Rather 
local, though not uncommon in W. England, N. Wales, among the 
Grampians, and the N.W. Highlands of Scotiand.—B. M.: Stiperstones, 
Shropshire; Clougha, Lancashire; Rhewgreidden, Merionethshire. Orian- 
larich and Ben Lawers, Perthshire ; Morrone, Braemar, Aberdeenshire ; 
Glen Nevis, Inverness-shire ; Hills of Applecross, Ross-shire. 
12. P. lacunosum Nyl. Mém. Soc. Cherb. v. (1857) p. 100; 
Syn. i.p.314.—Thallus foliaceo-expanded,reticulato-lacanose, broadly 
laciniate, or laciniato-lobed, glaucescent or greyish-white, beneath 
blackish or pale-brown towards the circumference; lacinie crenato- 
undulate and incised, rotundate at the apices (KTI¢owish CaCl7), 
Apothecia elevated, moderate or large, reddish-brown, the margin 
entire ; spores ellipsoid, (,006-8 mm. long, 0,004—-5 mm. thick.— 
Carroli, Journ. Bot. 1865, p. 288 ; Cromb. Lich. Brit. p. 27; Leight. 
Lich. Fl. p. 103, ed. 3, p. 98.—Cetraria lacunosa Ach. Meth. (1803) 
p- 295. 
Distinguished from the preceding, some states of which it closely re- 
sembles, by the much broader and rounded lacinie, with their reticulato- 
rugose upper surface. The thallus is frequently more or less isidiiferous, 
sometimes densely so, when growing in moist places. On dry exposed 
rocks it is of a dark-chestnut colour, as if it had been scorched. The 
apothecia have not been found in this country, but the spermogones, 
which are similar to those of Pl. glaucum, occasionally occur. 
Hab. On shady rocks in subalpine districts. — Distr. Local in the 8.W. 
and Central Highlands of Scotland, chiefly among the Grampians.—B.M. : 
Glen Falloch, Ben Lawers, and Craig Calliach, Perthshire ; Craig Cluny 
and Morrone, Braemar, Aberdeenshire; near Fort William, Inverness-shire. 
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