l'()2 LKCANO-LKCIDKEI [ fJACJlDIA 



ArgvU ; IviMim >re, Perfchshirn ; Tnll;i<Treen find iiorir llo«tellan, Goi'k ; 

 Little [slau'l and Dinish, Killaniey, Kerry ; Westporfc, Mayo ; Adare, 

 LiiU3ric]v ; Lettcrfi-ack, Goniieniara, Gal way. 



Form laurocerasi A. L. Sm. — Thallus crowdedly rimulose or 

 sublcproso, whifcisb. Apothecia convex, reddish-brown or partly 

 paler, imniarginate, whitish within ; .spores 0,053-95 mm. long, 

 0,0010-45 mm. tluck. -PdtcUaria laurocerdsi Duby in DC. Bot. 

 (rail. p. G53 (1830). Lccidea endolcuca f. hmrocerasl Nyl. in 

 Flora xlvii. p. 620 (1864); Cromb. Lich. Brit. p. 74. 



Perhaps rather a state than a distinct form, differing in the lighter- 

 coloured apothecia, wliicli are ratlier scattered in the two British 

 specimens, and are obtusely margined only in a very young condition. 



Hah. On ash and elm in maritime and upland districts. — Distr. 

 Karc in S. England and the Ghannel Islands. — B. M. Qucnvais, 

 Jersey ; near Lyndhurst, New Forest, Hants. 



25. B. umbrina 15ranth k Rostr. in Bot. Tidrsskr. iii. p. 235 

 (1(S69).— Thallus subefFuse, thin, granulose-leprose or subareolate, 

 dark-greyish, dark-green, blackish or yellowish (K — , CaCl — ), 

 sometimes subobsolete. Apothecia small, sessile, plane and 

 thinly margined, at length convex, immarginate, brownish or 

 blackish ; hypothecium colourless ; paraphyses coherent, olive- 

 brown or dark-greenish-blue at the apices ; spores vermiform- 

 cylindrical, spirally curved, 3-5-pluri-septate, 0,020-40 mm. long, 

 0,0025-35 mm. thick ; hymenial gelatine bluish then wine-red 

 or violet with iodine. — Lecidea umhrina Ach. Lich. Uni\'. p. 183 

 (1810) ; Carroll in Journ. Bot. v. p. 255 (1867) ; Leight. Lich. 

 Fl. ed. 3, p. 359 ; f. vermifera Nyl. Lich. Scand. p. 209 (1861). 

 L. pel idna Ach. I. c. p. 158; Cromb. Lich. Brit. p. 74; Leight. 

 Lich. Fl. p. 344. L. holomelsena Floerke ex Spreng. Syst. Veg. 

 iv. p. 256 (1827) pro parte. L. Jiolomelsena subsp. vermifera 

 Cromb. Lich. Brit. p. 91 (1871). Scoliciosporam vormifermn 

 Mudd Man. p. 185 (1861). 



Exiicc. Leight. n. 158 (as Lecidea vermifera) ; Mudd n. 153 ; 

 Johns, n. 342. 



Easily recognized by the spirally-curved spores, which are usually 

 pluriseptate, though sometimes apparently simple. The thallus 

 covers the substratum with a thin minutely broken crust. The 

 apothecia are numerous. Leighton's f. leptomera {I. c.) {Lecidea 

 leptomera Sommerf. Suppl. Fl. Lapp. p. 161 (1826) ) has a somewhat 

 lighter thallus. Crombie cites as Lecidea hulomchrna, Biatora 

 liolomelivna Hepp (Flecht. Eur. n. 12 (1853) ), a species that from its 

 two-celled spores belongs to the genus Biatorina. 



Hah. On rocks and stones, more rarely on old palings. — Distr. 

 General and common throughout the British Isles. — B. M. Boulay 

 Bay, Jerse}' ; Launceston, Gornwall ; Shoreham, Shermanbury and 

 Wisborough Green, Sussex ; Barmouth, Merioneth ; near Oswestry, 

 Sutton, near Shrewsbury, Sliperstones and Lyth Hill, Shropshire ; 

 Malvern, Worcestershire ; Trefriw, Carnarvonshire ; Buxton, Derby- 

 shire ; near Easby, Cleveland, Yorkshire ; High Force, Teesdale, 



