162 LECAXO-LECIDEEI [bACID 



Argyll ; Kenmore, Perthshire ; Tullagreen and near Kostellan, Corl 

 Little Island and Dinish, Killarney, Kerry ; Westport, Mayo ; Adar 

 Limerick; Letterfrack, Connemara, Gal way. 



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

 subleprose, whitish. Apothecia convex, reddish-brown or part 

 paler, immarginate, whitish within ; spores 0,053—95 mm. Ion 

 0,0040-45 mm. thick. — Patellaria laurocerasi Duby in DC. Bo 

 Gall. p. 653 (1830). Lecidea endoleuca f. laurocerasi Njl. i 

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



Perhaps rather a state than a distinct form, differing in the Ughte 

 coloured apothecia, which are rather scattered in the two Britii 

 specimens, and are obtusely mai'gined only in a very young conditio 



Hob. On ash and elm in maritime and upland districts. — Dist 

 Kare in S. England and the Channel Islands. — B. M. Quenvai 

 Jersey ; near Lyndhurst, New Forest, Hants. 



25. B. umbrina Branth A: Rostr. in Bot. Tidsskr. iii. p. 2i 

 (1869). — Thallus subeffuse, thin, granulose-leprose or subareolai 

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

 sometimes subobsolete. Apothecia small, sessile, plane ai 

 thinly margined, at length convex, immarginate, brownish 

 blackish ; hypothecium colourless ; paraphyses coherent, oliv 

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

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

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

 or violet with iodine. — Lecidea umbrina Ach. Lich. Univ. p. It 

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

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

 L. pelidna Ach. 1. c. p. 158; Cromb. Lich. Brit. p. 74; Leigh 

 Lich. Fl. p. 344. L. holomelsena Floerke ex Spreng. Syst. Ye, 

 iv. p. 256 (1827) pro parte. L. holomelsena subsp. vermifei 

 Cromb. Lich. Brit. p. 91 (1871). Scoliciosporum vermifera 

 Mudd Man. p. 185 (1861). 



Exsicc. Leight. n. 158 {as Lecidea vermifera) ; Mudd n. 15J 

 Johns, n. 342. 



Easily recognized by the spu'aUy -curved spores, which are usual 

 pluriseptate, though sometimes apparently simple. The thalli 

 covers the substratum with a thin minutely broken crust. Tl 

 apothecia are numerous. Leighton's f. leptomera (I. c.) (Lecidi 

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

 lighter thallus. Crombie cites as Lecidea Jwlomehma, Biatoi 

 holomelcena Hepp (Flecht. Eur. n. 12 (1853) ), a species that from i 

 two-celled spores belongs to the genus Biatorina. 



Hob. On rocks and stones, more rarely on old palings. — Dist 

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

 Bay, Jei-sey; Laimceston, Cornwall; Shoreham, Shermanbury ai 

 Wisborough Green, Sussex; Barmouth, Merioneth; near Oswestr 

 Sutton, near Shi-ewsbury, Sliperstones and Lyth Hill, Shropshire 

 Malvern, "Woroestershu-e ; Trefriw, Carnarvonshire ; Buxton, Derb 

 shue; near Easby, Cleveland, Yorkshire; High Force, Teesdai 



