ARTHONIA] ARTHONIACE^ 207 



Var. spadicea Nyl. in Mem. Soc. Sci. Nat. Cherb. iv. p. 92 

 (1856). — Differs from the species in the somewhat darker 

 apothecia and in the shorter unequally divided spores, 0,011- 

 12 mm. long, 0,004-5 mm. thick, the lower cell being frequently 

 elongate, bi-guttulate and spuriously divided. — Mudd Man. 

 p. 251. Subsp. spadicea Cromb. Lich. Brit. p. 103 (1870). 

 Arthonia spadicea Leight. in Ann. Mag. Nat. Hist. ser. 2, xiii. 

 p. 442, t. 8, lig. 39 (1854) ct Lich. Fl. p. 393 ; ed. 3, p. 417. 

 Exsicc. Leight. n. 97. 



Hah. On the trunks of trees. — Distr. Eare in the Channel Islands, 

 England and S. Ireland.— i^. M. Jersey ; Lustleigh, Devon ; Lynd- 

 hurst, New Forest, Hants ; Midliurst, Sussex ; Chedworth Woods, 

 Gloucestershire ; by the Wye, near Monmouth ; Gopsall, Leicester- 

 shire ; Barmouth and Dolgelly, Merioneth ; Bettws-y-Coed, Carnarvon- 

 shire ; Shelton Rough, near Shrewsbury, Shropshire ; Ayton, York- 

 shire ; Glendower Wood and Enniskean, Cork ; Muckruss and Eagle's 

 Nest, Killarney, Kerry. 



2. A. didyma Koerb. in Schles. Ges. Denkschr. Breslau 1853, 

 p. 235, emend. ; Almqu. in K. Svensk. Vet.-Akad. Handl. xvii. 

 n. 6, p. 13 (1880). — Thallus thin, effuse, smooth or furfuraceous, 

 whitish, or pale-brown. Apothecia small, crowded irregularly, 

 roundish, deep vinous-red or blackish, vinous-red within (K4- 

 violet or blue) ; spores obovate, colourless becoming brownish, 

 1-septate, 0,015-18 mm. long, 0,006-8 mm. thick; hymenial 

 gelatine greenish then blue with iodine. — A. pineti Koerb. Syst. 

 Lich. Germ. p. 292 (1855) ; Cromb. Lich. Brit. p. 104. A. vinosa 

 Leight. in Ann. Mag. Nat. Hist. ser. 2, xviii. p. 331 (1856) & 

 Lich. Fl. p. 391 ; ed. 3, p. 414 (incl. v a.i\ pineti Leight.) ; Mudd 

 Man. p. 250. A. lurida f. vinosa Cromb. Lich. Brit. p. 103 

 (1870). A. sapineti Nyl. in Flora lix. p. 239 (1876) ; Cromb. in 

 Grevillea v. p. 30 ; Leight. Lich. Fl. ed. 3, p. 415. 



Exsicc. Mudd n. 235. 



Intimately related to A. lurida, but differing in the paler thallus, 

 the somewhat larger spores, and in the reaction of the hymenial 

 gelatine with iodine. Leigh ton's specimen (n. 224), as noted by 

 Almqu. (I. c), belongs to the preceding species. 



Hah. On the bark of trees. — Distr. Somewhat rare throughout 

 the British Isles. — B. M. Lustleigh, Devon ; New Forest, Hants ; 

 Danbury, Essex ; Brandon Forest, Wilts ; Ulchin Wood, Norton, 

 AVorcester ; Builth, Brecknockshire ; Dolgelly, Merioneth ; Church 

 Strctton, Shropshire ; Gwydir Woods, Bettws-y-Coed, Carnarvonshire ; 

 Stagdale, Cleveland, Yorkshire ; Baroaldine, Argyll ; Abcrfeldy, Perth- 

 shire ; Castle Bernard and Enniskean, Cork ; Killery Bay, Conne- 

 mara, Galway. 



3. A. atrofuscella Nyl. in Flora Iviii. p. 363 (1875).— Thallus 

 whitish-glaucous, smooth. Apothecia minute, punctiform, reddish- 

 black ; spores obovate^ 1-septate, colourless^ becoming brownish, 



