arthothelium] arthoniaob^ 219 



Nat. Hist. Rev. vi. p. 532 (1859). A. parasemoides Nyl. I. c. ; 

 Mudd Man. p. 251. Lichen varians Davies in Trans. Linn. Soo. ii. 

 p. 284, t. 28, f. 3 (1794). 



Exsicc. Baxt. Stirp. Crypt, n. 47 ; Mudd n. 238 (as A. para- 

 semoides) ; Leight. n. 247 (as A. glaucomaria) ; Larb. Lich. Hb. 

 n. 155; Cromb. n. 99. 



ffaS. Parasitic on the apothecia of Lecanora glaucoma, destroying 

 the hymenium. Also recorded by Carroll (I. c.) on the apothecia of 

 Urceolaria scruposa. — Distr. Chiefly in mountainous and maritime 

 regions. — B. M. Noirmont and La Moze, Jersey ; Guernsey ; Sark ; 

 Newlyu Cliff, Penzance, and St. Minver, Cornwall ; Barmouth, 

 Merioneth ; Long Mynd, Shropshire ; Pwllheli, Carnarvonshire ; 

 Ay ton, Cleveland, Yorkshire ; Milnthorpe, Westmoreland ; Portlethen, 

 Kincardineshire ; Appin, Argyll ; Craig G-uie, Braemar, Aberdeenshire ; 

 Lambay Island, Dublin. 



26. A. subvarians Nyl. in Flora li. p. 345 (1868).— Thallus 

 none. Apothecia minute, scattered or confluent, blackish-brown, 

 more or less convex ; spores oblong-ovoid, colourless, becoming 

 brownish when old, 1-septate, 0,011-13 mm. long, 0,004-5 mm. 

 thick ; hymenial gelatine dark-dingy-brown with iodine. — 



A. galactinaria Leight. Lich. Fl. ed. 3, p. 426 (1879). 



Hob. Parasitic on the apothecia of Lecanora galactina. — Distr. 

 Bare in S. England. — B. M. Glynde, Sussex; near Cirencester, 

 Gloucestershire. 



27. A. punctella Nyl. ex Carroll in' Nat. Hist. Rev. vi. 

 p. 532 (1859). — Thallus none. Apothecia minute, black, innate 

 scattered ; spores oblong-clavate, colourless, brownish, 1-septate, 

 the upper cell largest ; 0,015 mm. long, 0,006 mm. thick. — Mudd 

 Man. p. 252 ; Cromb. Lich. Brit. p. 105 ; Leight. Lich. Fl. p. 403 ; 

 ed. 3, p. 426. 



Easily distinguished from the host by the minute size of the 

 apothecia. 



Hob. — Parasitic on the thallus of Bhizocarpon alboatrum. — 



B. M. Queenstown, near Cork (the only locality). 



28. A. peltigerea Th. Fr. in Bot. Not. 1866, p. 15.— Thallus 

 none. Apothecia rather large, orbicular, somewhat convex, 

 appressed, black ; hypothecium thick, dark-brown ; paraphyses 

 distinct, stout; spores oblong or ovate-oblong, 0,015-22 mm. 

 lono-, 0,006-8 mm. thick ; hymenial gelatine deep-wine-red with 

 iodine. 



JJah. — Parasitic on the thallus of Peltigera and Solorina saccata. — 

 B. M. On the thallus of Peltigera spuria on wall tops, Oorriemulzie, 

 Braemar, Aberdeenshire. 



84. ARTHOTHELIUM Massal. Ric. Lich. p. 54 (1852) 

 emend. ; Mudd Man. p. 252. (PI. 21.) 



Thallus crustaceous, uniform. Algal cells Trentepolilia. Apo- 



