260 LICHENACEI. [PARHELIA. 



p. 42. Parmelia physodes var. labrosa Cromb. Lich. Brit. p. 36 

 pro parte ; Leight. Lich. Fl. p. 126, ed. 3, p. 117. Lichen physodts 

 Eng. Bot. t. 126 (lower fig.). Brit. Exs. : 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 being protuberant on the apices of the laciuife. In this country, 

 as elsewhere, it seems to occur chiefly in a sterile condition. 



Hub. On trees and stone walls in maritime and upland situations. 

 Dislr. Not very general nor common in Great Britain ; not seen from Ire- 

 land, J3. 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; Asbv, Cumberland (fruit). New Galloway, Kirkcud- 

 brightshire ; Ben Lawers, Killin (fruit), and Abernethy, Perthshire ; 

 Durris, Kincardineshire ; Park, near Aberdeen ; liothiemurchus Woods, 

 Inverness-shire. 



Var. 0. platyphylla Ach. Meth. (1803) p. 251. Lacinise rather 

 broad, subconcrete, rugoso-plicate, roundly lobed and inciso- crenate 

 at the circumference. Apothecia very rare. Leight. Lich. Fl. 

 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 lacinise being more distinct and 

 depressed at the circumference. Occasionally it is more or less sorediate 

 at the apices of the lacinia?. As observed by Acharius /. 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. 



Hob. On old pales and stone walls in maritime and upland districts. 

 Dislr. Seen from several localities in Great Britain, Ireland, and 

 the Channel Islands. B. M. : Boulay Bay, Island of Jersey. Lydd, 

 Kent ; New Forest, Hampshire ; Evading, 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- 

 mtirchus, Inverness-shire. Near Cork. 



Form fuscescens Cromb. Grevillea, xv. (1887) p. 75. Thallus 

 rather smaller, opaque, esorediate, brownish; otherwise as above. 

 Parmelia pTiysodes var. obscurata Cromb. Journ. Bot. 1876, p. 360 ; 

 Leight, Lich.' Fl. 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. 



Hnb. On old pales in maritime districts. Distr. Local in S.E. England 

 and N.E. Scotland. B. M. : Lydd, Kent. Near Cove, Kincardineshire. 



