356 LiCHEXAcr.i. [lecaxora. 



Allied to subgenus Sqiiamaria, under which the species have usuallv 

 been included, but distinguished by the cephalodia, which are constant in 

 all the species (most of which are exotic) under all conditions of growth. 



8. L. gelida Ach. Lich. Tniv. 

 (1810) p. 428.— Thallus orbicular, 

 closelv adnata, rimoso-areolate in 

 the centre, laciniato-radiose at the 

 circumference, sordid-white or pale- 

 greyish (K-l- yellow, CaCl + red) ; 

 cephalodia scattered, grejish- or 

 brownish-desh-coloured. Apothe- 

 eia moderate, adnate, concave or 

 plane, pale-testaceous, the thalline 

 margin thick, entire ; spores ellip- 

 soid, 0.014-lS mm. long, 0,006-8 

 mm. thick. — Cromb. Journ. Linn. 

 Soc. Bot. XV. p. 232: Hook. Fl. 

 Scot. ii. p. 50 ; Tayl. in Mack. Fl. 

 Hib. ii. p. 14<). — Squamaria r/elida 

 8m. Eug. Fl, V. p. 195 ; Mudd, 



Fig. 60. 



Man. p. 129; Cromb. Lich. Brit. Lemnora{rhco,ms) pelida Ach. -a 



p. 45 ; Leight. Lich. Fl. p. 174, ed. 3, 



p. 159. Placodium gtlidum Gray, 



J^at. Arr. i. p. 448. Lichen geJidus 



Linn. Mant. ii. (1771) p. ]33; 



Dicks. Crypt, fasc. ii. p. 19 ; With. Arr. iv. p. 26 ; Eng. Bot. t. 699.— 



Brit. Exs. : Dicks. Hort. Sic. n. 25 ; Larb. Lich. Hb. n. 50. 



A gommic gloraerule and gonimic 

 granules, X o50. b. Two spores, 

 X 500. c. Sterigiiiata and sper- 

 matia, X 500. 



Easily recognized amongst British Lecanorei by the cephalodiiferous 

 thallus, which is usually of moderate size, greyish-flesh-coloured when 

 moist, and occasionally sprinkled with greyish or greyish-ohve, impressed 

 soredia. The cephaLidia. which are more or less numerous according to 

 the development of the thallus, are depresso-veiTucarioid, at length radi- 

 ato-rimose, internally with the gonimia glomerulose, or often several moni- 

 lifoiTU. The apothecia, when present (for the thallus is often sterile), are 

 usually sparingly scattered. A young sterile state, with the thallus little 

 developed andscattered and bearing a few young cephalodia, is form dis- 

 persa (non Fr.), Cromb. GreviUea, i. p. 171 ; Leight. Lich. Fl. iii. p. 160. 



Hah. On rocks, gi-anitic, schistose, and old red sandstone, in upland and 

 subalpiiie districts. — Distr. Rather local in England and Wales, more 

 frequent in Scotland, and ]a-obably also in Ireland. — B. M. : St. Aiistell, 

 Cornwall ; Cader Idris. Dolgelly, and Llyn Bodlyn, Merionethshire ; 

 E'^^lestone and Teesdale, Kurham ; near Kendal. Westmoreland ; Knock 

 Morton Screes, Cumberland. New Galloway, Kirkcudbrightshire ; Loch 

 Awe, Argylesliire; Craig Calliach, Ben Lawers, and Craig Tidloch, 

 Perthshire"; Clova and Canlochan, Forfarshire ; Glen Caudlic and (ilen 

 Cluuv, Braeraar, Aberdeenshire ; Eothiemurchus, Ben 2sevis, and Fort 

 Augustus, Inverness-shire ; Hills of Applecross, Ross-sliire. Dunkerron, 

 and Connor Clifls, Dingle, co. Ken-y ; Letterfrack and Recess, Coune- 

 mara, en. (Talway ; Carnlnugh, co. Antrim. 



