arthonia] aethoniaob^ 217 



ed. 3, p. 419. A. obscura var. melantera Ach. Syn. p. 7 (1814). 

 A. epipasta Mudd Man. p. 247 (1861) (non Koerb.) (spore 

 measurements incorrect) ; Leight. Lich. Fl. p. 397 ; ed. 3, p. 

 420 (spore measurements too large). A. astroidea var. epipasta 

 Nyl. in Mem. Soc. Sci. Nat. Cherb. v. p. 133 (1857) ; Cromb. 

 Lich. Brit. p. 103. Opegrapha mioroscopica Sm. Engl. Bot. 1. 1911 

 (1808). Hysterina microscopica S. F. Gray Nat. Arr. i. p. 506 

 (1821)? 



Exsicc. Mudd n. 230 (as A. epipasta). 



Distinguished from the species by the darker, shining thallus. 



Hab. On branches and trunks of trees. — Distr. Bare throughout 

 the British Isles. — B. M. Noirmont Manor, Jersey ; Newton Bushell, 

 Devon ; near Swindon, Gloucestershire ; Dolgelly, Merioneth ; near 

 Welshpool, Montgomeryshire; Stableford, Shropshire; Cliffrigg and 

 Ayton, Cleveland, Yorkshire ; Banks of Garry, Blair Athole, Perth- 

 shire ; Morrone, Braemar, Aberdeenshire ; near Crosshaven, Cork. 



20. A. insinuata Stirton in Trans. Glasgow Soc. Nat. 1875, 

 p. 90. — Thallus whitish or pale, subsquamulose, very thin. 

 Apothecia brown or brownish-black, adnate, round or oblong or 

 somewhat irregular, at first veiled, generally with a somewhat 

 squamulose thalline margin, internally pale ; spores 4 to 8 in the 

 ascus, colourless, sometimes slightly brownish, oblong, crenulate 

 at the margin, spuriously and equally 4-septate, 0,014-21 mm. 

 long, 0,006-8 mm. thick ; hymenial gelatine bright-blue with 

 iodine. — Leight. Lich. Fl. ed. 3, p. 423. Specimen not seen. 



Hab. On trees. Collected by Dr. Stirton near Killieorankie, Perth- 

 shire. 



§ iii. Lecideopsis Almquist in K. Svensk. Vet.-Akad. Handl. 

 xvii. n. 6, p. 46 (1880). 



Algal cells Palmellacese or thallus wanting. Apothecia 

 blackish ; spores usually 1- rarely pluri-septate. 



Spores i-septate. 



21. A. patellulata Nyl. in Bot. Not. 1853, p. 95.— Thallus 

 whitish, thin, efTuse. Apothecia black, small, roundish or 

 angular, appressed, plane, blackish within ; spores obovate, 

 colourless, 1-septate, small, 0,009-15 mm. long, 0,003-5 mm. 

 thick, the upper cell somewhat thicker, the lower longer and 

 oblong ; hymenial gelatine wine-red with iodine. — Carroll in 

 Journ. Bot. iii. p. 291 (1865) ; Cromb. Lich. Brit. p. 105 ; Leight. 

 Lich. Fl. p. 392 ; ed. 3, p. 416. 



Hab. On smooth bark in wooded regions. — Distr. Bare in Ireland. 

 — B. M. Carigogunnel, near Limerick. 



22. A. lapidicola Branth & Rostr. in Bot. Tidssk. iii. 

 p. 245 (1869). — Thallus darU-olivc-brown, thin, furfuraceous. 



