ARTHOPYRENIA] PYRENULACEiE 329 



Ireland. — B. M. Bosnieves, Cornwall ; Lyndhurst, New Forest, Hants ; 

 Torquay, Devon ; Capel Curig, Carnarvonshire ; Ingleby and Wester- 

 dale, Cleveland, Yorkshire ; near Muckruss, Killarney and Droinore, 

 Kerry. 



Growing on trees ; spores ^—1 -septate. 



32. A. platypyrenia A. L. Sm. — Thallus eflfuse, thin, faintly 

 brownish-yellow. Perithecia black, immersed at first, hemi- 

 spherical-depressed, the ostiole a very minute pore ; perithecial 

 wall dimidiate ; paraphyses branched, soft and irregular or 

 indistinct ; spores ellipsoid-oblong, 3-5-septate (rarely 7-septate), 

 the central cells largest, colourless, sometimes becoming smoky- 

 brown when old, 0,023-30 mm. long, 0,009-011 mm. thick.— 

 Verrucaria platypyrenia Nyl. in Flora xlviii. p. 358 (1865) ; 

 Leight. Lich. Fl. p. 450; ed. 3, p. 481. V. epidermidis var. 

 platypyrenia Carroll in Journ. Bot. iv. p. 25 (1866) ; Cromb. 

 Lich. Brit. p. 119 (1870). 



Distinguished by the flattened perithecia and by the peculiar spore 

 characters. 



Hah. On bark of ivy and' other trees. — Distr. Eare in S. and 

 S.W. Ireland. — B. M. Ballyedmond, Enniskeam and Glenbower, 

 Cork ; Old Dronaore, Kerry. 



33. A. chlorococca A. L. Sm. — Thallus green, thickish, sub- 

 squamulose-granular. Perithecia minute, black, innate, convex 

 or depressed above, the ostiole a minute pore ; perithecial wall 

 black, thin, scarcely visible under the base ; asci ellipsoid rather 

 short ; paraphyses slender, mucilaginous, disappearing ; spores 8 

 in the ascus, colourless or faintly yellowish, broadly fusiform, 

 obtuse at the apices, 5-7-septate, 0,030-37 mm. long, 0,004-5 mm. 

 thick. — Verrucaria chlorococca Leight. Lich. Fl. ed. 3, p. 484 

 (1879) emend. 



Hab. On mossy bark of tree. — B. M. Stokenchurch, Chiltern Hills, 

 Oxfordshire (the only locality). 



34. A. desistens A. L. Sm. — Thallus scanty. Perithecia 

 minute, black, prominent, the upper part convex ; perithecial 

 wall entire ; paraphyses none ; spores 8 in the ascus, colourless, 

 fusiform, 3-5-septate, 0,011-16 mm. long, 0,003-4 mm. thick ; 

 hymenial gelatine wine-red with iodine. — Verrucaria desistens 

 Nyl. in Flora 1. p. 180 (1867); Carroll in Journ. Bot. v. p. 260 

 (1867); Cromb. Lich. Brit. p. 122; Leight. Lich. Fl. p. 450; 

 ed. 3, p. 481. Specimen not seen, 



Hab. On old trees. — Distr. Rare in S.W. Ireland (Tore Mt., 

 Killarney, Kerry). 



114. LEPTORH APHIS Koerb. Syst. Lich. Germ. p. 371 

 (1855). (PI. 50.) 



Thallus crustaceous, thin, usually developed within the bark. 



