290 Rev. W. A. Lcighton on the British Umbilicarije. 



pale pniinose grey in tlic centre, whence it griulually darkens 

 towards tlic edges, where it is nearly black ; in some specimens 

 all over blackish ; always marked, especially about the centre, 

 with elevated reticulated veins, which arc very conspicuous in 

 most individuals, though occasionally almost wanting : vnder 

 surface quite smooth, execjit now and then a few granulations 

 towards the central j^art, naked, of a smoky-brown, varying in 

 depth, somewhat palest when wet, and always lightest near the 

 middle : substance thin, between coriaceous and membranous, 

 flexible when moist, and often scarcely rigid, though very brittle, 

 when dry. Tric(V numerous, scattered all over the thallus, quite 

 sessile, though affixed only by their centre, depressed, usually 

 orbicular, but varying to angular and reniform, surrounded by 

 an entire elevated margin. Disk nearly flat; its gyri either eon- 

 centric or arranged in several parcels, lying together without any 

 regular order, and often leaving in the middle a subtriangular 

 cavity." — Lich. Brit.* 



Swedish specimens from Stenhammer and Nylander, labelled 

 Umbilicaria jjTuboscidea (L.) Fries, are identical. 



b. fimbriata, Turn. & Borr. Thallus edged with a few black, 

 branched, tooth-like fibres. 



Gyrophora deusta, ^.fimbriata, Turn. & Borr. Lich. Brit. 222. 

 proboscidea, Moug. & Nest. Stirpes Yosgcs. 2-19 ! 



Similar in substance, colour, and every other respect with * a,' 

 except in having the edges of the thallus here and there toothed 

 and fringed with a few scattered black branching fibres; evi- 

 dencing an approach to proboscidea. There are also occasionally 

 a few fibres sprinkled over the underside. 



Highlands of Scotland ! Mr. Borrer. Between Glen Callater 

 and Lochnagar, Scotland ! Mr. J. Tatham. Clova ! and about 

 Loch Phadrich ! Mr. W. Gardner in herb. Borrer. Swinhopc 

 Fell, Durham ! Mr. JV. Mudd. Glenmalure, co. Wicklow, Mr. 

 Isaac Carroll. 



Specimens in my herbarium collected at Tourmalet, Pyrenees, 

 by M. Philippe and Mr. Spruce, coincide with this state. 



c. corrugata, Turn. & Borr. Thallus thin, rough with ele- 

 vated reticulations. 



Umbilicaria corrurjata, Iloffm. PI. Lich. 2. 65. t. 43. f. 4-7 (17^)4), admi- 

 rable ; Massal. Ricerch. (\\. fig. 11. 'i. 

 Lichen prohoscideus (in part), .\ch. Prodr. 147 (1798). 

 Gyrophora proboscidea, /3. exasperata, Ach. ! Meth. 105 (1803). 



* For the spermagonia see Tulasne, /. e. 



