Graphis .] 
VII. LICHENES. 
587 
Northern Island: Auckland, on bark, Knight. — Browner than G. insidiosa, thallus 
less warty, apothecia faintly visible by a dark line. It may be a form of G. nitida, Mont. 
35. OPEGEAPHA, Acli. 
Thallus excessively thin or almost evanescent. Apothecia superficial or 
with the base innate, black, linear-lanceolate rounded or linear, elongate, 
flexuose or branched, with a proper border ; epithecium plane or like a narrow 
slit ; spores colourless or brownish, fusiform, few-septate. Spermatia slender, 
cylindric straight or curved. 
A very large tropical or subtropical genus, rarer in temperate regions. 
1. O. varia, Per soon. Thallus thin, powdery, white or brown, dispersed. 
Apothecia sessile, prominent, scattered, roundish oval or oblong, wavy ; disk 
plane, at length convex, hemispherical, somewhat tuberculose ; border sub- 
evanescent; spores fusiform, 3-9-septate. — Nyland. Lich. Scand. 252. 
Var. Thallus olive-green ; apothecia superficial, slender; spores 5-9-septate, 0 0003 in. 
broad, 0'00115 long. — Knight and Mitt, in Trans. Linn. Soc. 23. 101. t. 11. f. 15. 
Var. Thallus olive-brown, tending to grey ; apothecia more or less immersed when moist ; 
margin separating in the middle ; spores i-5-septate, 0'00024 in. broad, 0 0009 long. — 
Knight and Mitt. 1. c. f. 16. 
Var. Thallus dusky-grey; apothecia immersed when moist, oblong, open; spores 3-4- 
septate, 0'00025 in. broad, 0'0007 broad. — Knight and Mitt. 1. c. f. 17- 
Northern Island : Auckland, on bark, Knight. (Cosmopolite.) 
2. O. atra, Ac/i. Thallus very thin, membranous, smooth, whitish. 
Apothecia sessile, various in shape, the smaller globose or oblong, the larger 
long, narrow, terete, subrugulose, coal-black, simple or divided ; spores ob- 
long-ovoid, 3-septate.— -Nyland. Lich. Scand. 254. 
Northern Island : Auckland, on bark, Knight. Lord Auckland’s group, J. B. H. 
(Cosmopolite.) 
3. O. herpetica, Acli. Thallus continuous, limited, very thin, reddish 
ash-coloured or brownish, slightly rugged. Apothecia immersed, oblong 
linear rounded or elliptic, somewhat curved, the disk broader than the 
border; spores fusiform, 3-septate. — Nyland. Lich. Scand. 255. 
Var, rufescens. Apothecia flexuose, sometimes divided. 
Northern Island: Auckland, on bark, Knight. 
4. O. cinerea, Knight and Mitt, in Linn. Trans, xxii. 101. t. 12./. 18. 
Thallus ashy-grey, pulverulent, sometimes obsolete. Apothecia superficial, 
simple, oblong, straight or curved, closed ; spores brown, 3-septate or 1- 
septate and contracted in the middle, frequently murally divided, Q'00025 in. 
broad, 0-00075 long. 
Northern Island : Auckland, on hark, Knight.- — The short thick closed apothecia at 
once distinguish this from O. varia. 
5. O. prominula, Knight and Mitt. l.c. 102. t. 11./. 19. Thallus 
white, uneven or minutely warted, moderately thick, containing extensive 
patches of green round gonidia. Apothecia superficial, crowded, subparallel 
or disposed in all directions, straight or curved, closed ; spores ellipsoid or 
oblong, 7-septate, 0-00015 in. broad, 0-0008 in. long. 
2 Q 2 
