ARTHONIA] AETHONIACBiE 213 



— B. M. Becky Falls, Devon ; Barmouth, Merioneth ; Pontesbury, 

 Shropshire; Baysdale, Cleveland and Farndale, Yorkshire; Dinish, 

 Killarney, Kerry. 



13. A. arthonioides A. L. Sm. — Thallus rather thick, cream- 

 coloured slightly tinged with rose, effuse, smooth becoming 

 pulverulent. Apothecia small, numerous, solitary or rarely 

 cenfluent, rounded, somewhat convex, immarginate, the disc 

 rough and pulverulent when old ; spores 6-8 in the ascus, linear- 

 clavate, 3-septate, the upper cell slightly larger, 0,013-16 mm. 

 long, 0,006-7 mm. thick ; hymenial gelatine yellowish-red with 

 iodine.^ — A. trachylioides Njl. in Mem. Soc. Sci. Nat. Cherb. iv. 

 p. 99 (1856) ; Mudd Man. p. 251, t. 4, f. 98 ; Cromb. Lich. Brit, 

 p. 104 ; Leight. Lich. Fl. p. 398 ; ed. 3, p. 421. Lecidea artho- 

 nioides Ach. Lich. Univ. p. 178 (1810). 



Exsicc. Mudd n. 237. 



Hdb. On rocks. — Distr. Rare in subalpine or mountainous 

 districts. — B. M. Great Orme's Head, Carnarvonshire ; Ingleby and 

 Highcliff, Cleveland, Yorkshire. 



14. A. dendritiea A. L. Sm.— Thallus whitish or greyish, 

 effuse, tartareoiis, rather thick in places, smooth. Apothecia 

 black, innate, roundish or somewhat elongate and irregularly 

 radiate, contiguous and confluent or solitary, plane, internally 

 pale ; asci pyriform ; spores obovate, or clavate, colourless, 2-4- 

 septate, upper cell largest, 0,017-22 mm. long, 0,005-7 mm. thick. 

 — Stigmatidium dendriticum Leight. in Journ. Bot. xiii. p. 257, 

 t. 166 (1875) & Lich. Fl. ed. 3, p. 413. 



Exsicc. Larb. Lich. Hb. n. 192. 



Eesembles Enterographa in the grouping of the apothecia, but 

 is separated from that genus by the form and structure of asoi and 

 spores. I 



Hah. On rooks. — Distr. Very rare in W. Ireland. — B. M. Tully 

 and Doughruagh Mt., Connemara, Galway (the only localities). 



15. A. ilicina Tayl. in Mackay FL, Hib. ii. p. 105 (1836).— 

 Thallus cream-coloured, thin, smooth, shining, limited by a 

 brownish border varying in width. Apothecia small, scattered, 

 subimmersed, irregularly round or oblong, blackish-brown, plane ; 

 spores colourless or pale yellow, obovate-clavate, 6-septate, the 

 upper cell largest, 0,021-36 mm. long, 0,009-12 mm. thick ; 

 hymenial gelatine blue, the asci yellowish or wine-red, with 

 iodine. — Leight. in Ann. Mag. Nat. Hist. ser. 2, xiii. p. 441, 

 t. 8, f. 36 (1854) & Lich. Fl. p. 401 ; ed. 3, p. 425 ; Mudd Man. 

 p. 248 ; Oromb. Lich. Brit. p. 102. A. ilicinella Nyl. in Flora 1. 

 p. 179 (1867) ; Carroll in Journ. Bot. v. p. 259 (1867) ; Cromb. 

 I. c. Leight. Lich. Fl. II. c. A. suhexcedens Nyl. in Flora Ixii. 

 p. 221 (1879) ; Cromb. in Grevillea viii. p. 29. 



