OPEGEAPHA] GRAPHIDACE*. 233 



Var. arthonoidea Leight. ex Mudd Man. p. 232 (1861).— 

 Apotheoia variously difFormed and flattened, crowded and con- 

 fluent, forming irregular black masses, scattered or subparallel. — 

 P. arthonoidea Leight. Lich. PI. p. 377 (1871) ; ed. 3, p. 399. 

 Opegrapha nimhosa Sm. Engl. Bot. t. 2346 (1811)? (non Ach.). 



ExsicG. Leight. n. 338. 



Bah. On trees. — Distr. Somewhat rare throughout the British 

 Isles.— B. M. Withiel, Cornwall; Newton BusheU and Ullacombe, 

 near Bovey Tracey, Devon ; Shanklin, I. of Wight ; Saddlescomb and 

 St. Leonards, Sussex; New Forest, Hants; Stokesay, Shropshire; 

 Edderton, Montgomeryshire; Epping Forest, Essex; Cottishall, 

 Norfolk ; Conway, Carnarvonshire ; Airyhohne and Oliffrigg, Cleveland, 

 Yorkshire ; Swanston, near Edinburgh ; Carrigaloe, Cork. 



4. 0. atricolor Stirton in Trans. Glasg. Soc. Nat. 1875, p. 89. 

 — Thallus whitish, thin. Apothecia black, innate, sessile, narrow, 

 somewhat acute, usually simple, internally blackish-grey or pallid 

 brown; disc slit-like, becoming somewhat concave or even 

 flattened, rugulose ; hypotheoium brownish-black ; paraphyses 

 indistinct, irregular, dark-brown at the apices ; spores 4-8 in 

 the ascus, oblong-ovoid, 3-septate, colourless, 0,015-21 mm. long, 

 0,004-5 mm. thick ; upper part of hymenium blue, the lower 

 part yellow, becoming wine-red with iodine. — Leight. Lich. Fl. 

 ed. 3, p. 400. Specimen not seen. 



Hob. On decorticated wood, near Altnaharra, Sutherland. 



5. 0. betulina Sm. Engl. Bot. t. 2281 (1811) non Pers.— 

 Thallus dull-yellowish, brownish or whitish, often limited by a 

 dark line. Apothecia very prominent, sessile, mostly simple, 

 elongate, the disc narrow, uniform ; margins plump, rounded and 

 incurved ; hypothecium almost black, the hymenium usually 

 clear and colourless ; spores linear-obovate, colourless, 3-septate, 

 occasionally 4-septate, 0,017-23 mm. long, 0,005-7 mm. thick; 

 spermogones with rod-shaped spermatia, 0,004-6 mm. long. — 

 Hook, in Sm. Engl. PI. v. p. 145 (excl. syn.). 0. herharum 

 Mont, in Arch. Bot. p. 302, t. 15, f. 1 (1833) 1 0. atra f. herharum 

 Leight. Lich. PI. p. 377 ; ed. 3, p. 399. O. Turneri Leight. in 

 Ann. Mag. Nat. Hist. ser. 2, xiii. p. 202, t. 5, f. 10 (1854) & 

 Lich. PI. p. 378; ed. 3, p. 400; Mudd Man. p. 231 ; Cromb. in 

 Grevillea i. p. 173. 0. atrorimalis Nyl. in Plora xlvii. p. 488 

 (1864); Oromb. Lich. Brit. p. 98. O.varia subsp. rimalis Cromb. 

 Z. c. p. 97(1870)? 



Exsicc. Larb. Lich. Hb. nos. 76, 109. 



Forming a transition between 0. atra and 0. va/ria. The apothecia 

 are stouter than in 0. atra, and the spores broader and with a more 

 distinct epispore, somewhat like those of 0. va/ria in appearance, 

 though smaller and usually 3-septate. 



Hah. On trees, occasionally on paUngs. — Distr. Somewhat frequent 

 in England, rarer in Scotland and Ireland, not recorded from the 

 Channel Islands. — B. M. Lustleigh, Devon; near Lyndhurst, New 



