BILIMBIAJ LECIDEACE^ 145 



spherical, immargiriate, somewhat shining or opaque, blackish ; 

 paraphyses concrete, dark-greenish-blue or dark-olivaceous at the 

 apices ; hypothecium pale- or sordid-brown ; spores oblong or 

 narrowly oblong-fusiform, straight or slightly curved, 3— 7 -septate, 

 0,016-32 mm. long, 0,005-7 mm. thick; hymenial gelatine 

 bluish, the asci at length dark, with iodine. — B. milliaria Koerb. 

 Syst. Lich. Germ. p. 214 (1855); Mudd Man. p. 188. Lecidea 

 lignaria Ach. in Vet. Acad. Handl. 1808, p. 236 & Lich. Univ. 

 p. 169. L. milliaria Fr. in Yet. Acad. Handl. 1822, p. 255 ; 

 Leight. Lich. Fl. p. 338 pro parte (inch f. lignaria & f. saxigena) ; 

 ed. 3, p. 362 pro parte ; Cromb. in Grevillea xxii. p. 58. 

 L. geomoea Tayl. in Mackay Fl. Hib. ii. p. 124 (1836). L. ulig- 

 inosa var. geomoea Ach. Meth. p. 43 (1803). L. sabuletorum var. 

 milliaria Cromb. Lich. Brit. p. 71 (1870). 



Exsicc. Mudd nos. 156, 158; Leight. nos. 210, 238, 386, 

 388 ; Larb. Lich. Hb. 272 ; Bohl. n. 85 ; Johns, n. 375 (as 

 Lecidea Turneri). 



Externally well characterized by the very numerous small often 

 crowded or confluent apothecia, and also by their internal structure. 

 The thallus varies somewhat in colour and form according to the 

 habitat. Lecidea saxigena Uloth ex Leight. Lich. Fl. ed. 3, p. 363 is 

 incompletely described, but is evidently a saxicolous condition of this 

 species. It is recorded from Wales and N.W. Ireland. 



Hah. On the ground, usually incrusting mosses, rarely on old 

 palings, rocks, and stones from maritime to alpine situations. — Distr. 

 Somewhat local in Great Britain and Ireland, but usuall}^ plentiful 

 where it occurs ; very rare and only saxicolous in the Channel Islands. 

 — B. M, Eozel, Jersey ; Epping Forest, Essex ; Toy Hill, Kent ; Leith 

 Hill, Surrey ; Fairlight Glen, Hastings, Lavington and Chillington 

 Common, Sussex ; near L,}Tidhurst, New Forest, Hants ; Dartmoor, 

 Devon ; near Penzance, Cornwall ; Buxton, Derbyshire ; Neescliff 

 Hill, Shropshire ; Llyn Howel, Dolgelly and Cader Idris, Merioneth ; 

 Glyder Fawr, Carnarvonshire ; Glandwr, Carmarthenshire ; Baj'sdale 

 and Guisboro' Moor, Cleveland, Yorkshire ; Ben Cruachan, Argyll ; 

 Crianlarich, Craig Calliaeh and Ben Lawers, Perthshire ; Banchory 

 Devenick, near Aberdeen, Craig Guie, Braemar, Aberdeenshire ; near 

 Belfast, Antrim ; Doneraile Mts., Cork ; Duukerron and Killarnej', 

 Kerry ; near Kylemore, Galway. 



Form nigrata A. L. Sm. — Thallus dark, scarcely visible ; 

 hypothallus blackish, predominating. A2:)othecia black ; spores 

 fusiform, 0,030-40 mm. long, 0,007 mm. thick. — Lecidea sabule- 

 torum var. milliaria f. nigrata Nyl. in Not. Sallsk. Faun. & Fl. 

 Fenn. n. ser. v. p. 151 (1866). 



Perhaps merely an alpine condition, with nearly obliterated thallus 

 (very sparingly present in the British specimen) and slightly different 

 spores. 



Hah. Incrusting mosses on rocks in an alpine situation. — B. M. 

 Summit of Ben Lawers, Perthshire. 



22. B. melsena Arnold in Flora xlviii. p. 596 (1865).— 

 Thallus effuse, very thin, leprose-granulose, sordid -greenish, 

 II. L 



