290 Rev. W. A. Leigh ton on the British Umbilicarise. 



pale pruinose grey in the centre, whence it gradually darkens 

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

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

 with elevated reticulated veins, which are very conspicuous in 

 most individuals, though occasionally almost wanting : under 

 surface quite smooth, except now and then a few granulations 

 towards the central part, 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. Tricce 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 ffyri either con- 

 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 proboscidea (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 Vosges. 249 ! 



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. Swinhope 

 Fell, Durham ! Mr. W. 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. 



Umbilicana corrugata, HofFm. PI. Lich. 2. 65. t. 43. f. 4-7 (1794), admi- 

 rable; Massal. Ricerch. 61. fig. 113. 

 Lichen proboscideus (in part), Ach. Prodr. 147 (1798). 

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



* For the spermagonia see Tulasne, I. c. 



