326 LICHEN ACEl. [GYROPUOKA. 



Forfarshire ; Craig Coinnoch, Lochnagar, near Invercauld, Glen Callater 

 and Ben Macdhui, Braemar, Aberdeenshire ; Glen Nevis and Ben Nevis, 

 Inverness-shire . 



Form 1. fimbriata Mudd,Man.(1860)p. 118. Thallus sparingly 

 fibrillose at the margins and on the under surface ; otherwise as 

 above. Cromb. Grevillea, XY. p. 79. Umlilicaria proboscidea form 

 Jlmbriata Leight. Lich. Fl. p. 160, ed. 3, p. ]47. Gyrophora deusta 

 ft. fimbriata Turn. & Borr. Lich. Br. (1839) p. 222. 



Seems always to grow associated with the type, of which it is probahly 

 to be regarded only as a state, since at times similar conditions occur in 

 the variety. The "fibrillge are usually very few, though occasionally 

 they are more numerous. 



Hob. On rocks and stone walls in upland and subalpine districts. 

 Distr. Local and rare in N. Wales and N. England; more common 

 among the Grampians, Scotland. B. M. : Snowdon, Carnarvonshire ; 

 Swinhope Fell, Durham. Ben Lawers, Perthshire ; Clova, Forfarshire ; 

 Craig Coinuoch, and Cairngorm, Braemar, Aberdeenshire. 



Form 2. exasperata Ach. Meth. (1803) p. 105. Thallus deeply 

 plicato-corrugate, the plica? crowded, undulate, and subreticulate. 

 Cromb. Grevillea, xv. p. 79. Umbilicaria proboscidea var. exasperata 

 Cromb. Lich. Brit. p. 40. GyropTiora de^^sta y. corrugata (Hoffm.), 

 Turn. & Borr. Lich. Br. p. 222. Umbilicaria varia 6. deusta c. 

 corrugata Leight. Ann. Mag. Nat. Hist. ser. 2, xviii. p. 290. Gyro- 

 phora proboscidea c. corrngata Mudd, Man. p. 118. Umbilicaria 

 proboscidea f. corrttgata Leight. Lich. Fl. p. 160, ed. 3, p. 148. 

 The trivial name corrugata Hoffm. (PI. Lich. (1794) p. 65) has 

 priority ; but I have retained that of Acharius in order to prevent 

 confusion with G. corrugata (Ach.) Nyl. 



Differs in the very prominent reticulate rugae of the upper surface, 

 which are nearly a line in height, and which " look like a series of erect 

 curled squamules" sometimes developing into small lobules. These 

 occur chiefly towards the centre of the thallus (except in smaller plants), 

 beyond which it is usually very rugose, " almost papillose." To this 

 latter state belongs var. mesenteriformis (non Wulf. nee Schser.), Turn. 

 & Borr. 1. c., Leight. II. cc., Mudd, Man. p. 118. The few British specimens 

 are sparingly fertile. 



Hob. On rocks and boulders in alpine places. Distr. Very scarce 

 among the N. Scottish Grampians. B. M. : Ben-naboord, Braemar, 

 Aberdeenshire. 



Var. ft. deplicans Fr. fil. Lich. Scand. i. (1871) p. 163. Thallna 

 brown-fuliginous, scarcely greyish in the centre, continuously rugose 

 or rngulose on the upper surface. Cromb. Journ. Bot. 1882, p. 273. 

 Umbilicaria proboscidea var. deplicans Nyl. Lich. Scand. (1861) 

 p. 116. 



Well distinguished from the type by the absence of reticulate plica?. 

 In the few British specimens the under surface and the margins are more 

 or less fibrillose, so that in this respect they are analogous to f 



