260 LICHENACEI. [PARMELIA. 
p. 42. Parmelia physodes var. labrosa Cromb. Lich. Brit. p. 36 
pro parte; Leight. Lich. Fl. p. 126, ed. 3, p. 11%. Lichen physodes 
Eng. Bot. t. 126 (lower fig.).— Brit. Evs.: Mudd, n. 70 pro parte ; 
Leight. n. 48 pro parte. 
A more distinct form than the preceding, with which it has sometimes 
been confounded. It is readily recognized by the thallus, and by the 
soredia beiny protuberant on the apices of the laciniz. In this country, 
as elsewhere, it seems to occur chiefly in a sterile condition. 
Hab. On trees and stone walls in maritime and upland situations.— 
Distr, Not very general nor common in Great Britain; not seen from Ire- 
land.—B. M.: Lustleigh Cleeve, Devonshire; near Penzance and Withiel, 
Cornwall; Malvern Hills, Worcestershire; Sweeny, Shropshire; near 
Monmouth; Rhewgreidden, Merionethshire; Bettws-y-Coed, Denbigh- 
shire; Beddgelert, Carnarvonshire ; Cleveland, Yorkshire ; near Kendal, 
Westmoreland; Asby, Cumberland (fruit). New Galloway, Kirkeud- 
brightshire; Ben Lawers, Killin (fruit), and Abernethy, Perthshire ; 
Durris, Kincardineshire ; Park, near Aberdeen; Rothiemurchus Woods, 
Inverness-shire. 
Var. 6. platyphylla Ach. Meth. (1803) p. 251.—Lacinie rather 
broad, subconcrete, rugoso-plicate, roundly lobed and inciso-crenate 
at the circumference. Apothecia very rare.—Leight. Lich. FI. 
p. 126, ed. 3, p. 117.— Brit. Exs.: Larb. Lich. Hb. n. 329. 
Usually smaller, though thicker than in the type. In the centre it is 
rugose plicate-and scarcely laciniate, the lacinize being more distinct and 
depressed at the circumference. Occasionally it is more or less sorediate 
at the apices of the lacinie. As observed by Acharius J. c., the whole 
thallus has a monophyllous appearance; but transition forms are not 
wanting. It is very rarely fertile, the spermogones, however, being not 
unfrequent. 
Hab. On old pales and stone walls in maritime and upland districts. 
—Distr. Seen from several localities in Great Britain, Ireland, and 
the Channel Islands:—B. M.: Boulay Bay, Island of Jersey. Lydd, 
Kent; New Forest, Hampshire; Brading, Isle of Wight; near Ciren- 
cester, Gloucestershire; Gopsall Park, Leicestershire; Harboro’ Magna, 
Warwickshire; Aberdovey and near Barmouth, Merionethshire. Killin, 
Craig Tulloch, Ben Lawers (fruit), and Aberfeldy, Perthshire ; Guthrie, 
Forfarshire ; near Nigg, Kincardineshire ; Park, near Aberdeen; Rothie- 
murchus, Inverness-shire. Near Cork. 
Form fuscescens Cromb. Grevillea, xv. (1887) p. 75.—Thallus 
rather smaller, opaque, esorediate, brownish; otherwise as above.— 
Parmelia physodes var. obscurata Cromb. Journ. Bot. 1876, p. 360 ; 
Leight. Lich. FI. ed. 3, p. 118.—According to Nylander, Flora, 1881, 
p. 537, var. obscurata Ach. is P, austerodes Nyl., a subspecies of 
P. vittata. 
Evidently referable as a form to var. platyphylla, with which, except 
in being somewhat smaller, constantly esorediate, and especially in the 
colour of the thallus (owing probably to being suffused with salt-water), 
it in other respects agrees. In the few specimens gathered neither apo- 
thecia nor spermogones are visible. 
Hab. On old pales in maritime districts — Distr. Local in 8.E. England 
and N.E, Scotland.—B. M.: Lydd, Kent. Near Cove, Kincardineshire, 
