GYKOl'HORA.] GYKOTHOREI. 325 



mm. long, 0,003-10 mm. thick. Mudd, Man. p. 120 ; Cromb. Journ. 

 Linn. Soc. Bot. xvii. p. 57o. Umbilicaria grisea Leight. Lich. Fl. 

 p. 157, ed. 3, p. 147. Umbilicaria varia rj. grisea Leight. Ann. 

 Mag. Nat. Hist. ser. 2, xviii. p. 283. Lishsn grixeus Sw. in Westr. 

 Vet. Ak. Handl. 1793, p. 52. Gyrophtra murina Ach. Eng. Bot. 

 t. 2486 ; Gray, Nat. Arr. i. p. 478 ; Sm. Eng. Fl. v. p. 218. Lichen 

 DUhnii With. Arr. ed. 3, iv. p. 63. Lichen deustus Huds. Fl. Angl. 

 p. 455. Lichenoides coriacewn cinereum, pdtis atris compressis Dill. 

 Muse. 219, t. 30. f. 117. Lichenoiles saxatile foliis minus divisis, 

 cinereo-fnscum Dill, in Ray, Syn. ed. 3, p. 73, n. 66. 



Has its nearest ally in G. hirsuta Ach., which is unknown in this 

 country. It is easily recognized from the allied British species by the 

 colour of the thallus, which is generally monophyllous, and by the cha- 

 racters of its upper and lower surfaces. With us it is not seen fertile. 



Hub. Oa rock? in maritime districts. Distr. Found only very sparingly 

 in the Channel Islands and S.W. Englanl (lib. Buddie). B. SL: 

 Beauport, Island of Jersey. St. Vincent's Rocks, Bristol, Gloucestershire. 

 There is also a specimen marked ? Glyder Vawr, N. Wales, where it is 

 not likely to have been gathered. 



2. G. proboscilea Ach. Metb, (1803) p. 105. Thallus mono- 

 phyllous, somewhat thin, nearly moderate or small, crenate or 

 slightly lobed at the margin, reticulato-rugose (especially in the 

 centre), blackish-brown or blackish, greyish-pruinose in the centre ; 

 beneath smooth, naked, pale-greyish or partly dark-greyish (K~, 

 CaCl+ reddlsh ). Apothecia at first thinly margined and somewhat 

 plane, at length immarginate, convex, gyroso-plicate ; spores 0,012- 

 18 mm. long, 0,006-8 mm. thick. Eng. Bot. t. 2484 ; Gray, Nat. 

 Arr. i. p. 476 ; Hook. Fl. Scot. ii. p. 41 ; Turn. & Borr. Lich. Br. 

 p. 222 ; Sm. Eng. Fl. v. p. 217 ; Mudd, Man. p. 118. UmbUicaria 

 probosoidea Cromb. Lich. Brit, p. 40 ; Leight. Lich. Fl. p. 160, ed. 3, 

 p. 147. Lichen proboscideus Ach. Prodr. (1798) p. 147. Utiibtti- 

 caria varia 6. deusta Leight. Ann. Mag. Nat. Hist. ser. 2, xviii. 

 p. 289. Lichen deustus Huds. Fl. Angl. p. 455; Lightf. Fl. Scot. ii. 

 p. 861 ; With. Arr. ed. 3, iv. p. 63. 



Distinguished from allied species by the thallus being more or less 

 reticulato-corrugate on the upper surface, with the rugae more distinct in 

 the centre and less visible towards the circumference, where it is some- 

 times nearly smooth. The thallus is closely appressed to the sub- 

 stratum, thinnish, somewhat rigid and brittle,\arying in other respects 

 as in the forms and variety that follow. It is generally well fertile, with 

 numerous and small, or "fewer and nearly moderate apothecia. The 

 spermogones are rare, with the spermatia about 0,004 mm. long, 0,001 

 mm. thick. 



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

 Distr. Somewhat local in N. Wales, N. England, and in S. Scotland ; 

 general and plentiful amongst the Grampians"; reported also (but doubt- 

 fully) from S.W. Ireland. B. M. : Cader Idris, Merionethshire ; Snow- 

 don", Carnarvonshire ; Cardiganshire ; Teesdale, Durham. New Galloway, 

 Kirkcudbrightshire ; Ben Lawers and Ben More. Perthshire; Clova, 



