Arthonia.~\ 
VII. LICHENES. 
591 
curved, one end larger, blackish-brown, internally brown ; spores obovate, 4- 
septate, light yellow, (L00030 in. broad, 0'00084 long. 
Northern Island: Auckland, on bark, Knight. — The apothecia have no dark marginal 
line as in most of its allies. 
11. A. polymorpha, Ach. ; — Bab. in FI. N. Z. ii. 302. Thallus sub- 
membranous, ashy-white, variegated with olive-green. Apothecia large, sub- 
orbicular, pruinose, glaucous-blue, when moist, tumid, tubercular and black ; 
spores murally divided. — Eschweiler in Mart. Ic. Sel. Crypt. Eras. 14. t. 9. 
f. 3 (not in Nyland. Enum.). 
Northern Island : on hark, Colenso. (Brazil.) 
The following Arthonioe are enumerated in Dr. Lindsay’s ‘ Catalogue of Otago Lichens 
A. excidens, Nyl. ; conspicua, Nyl. ; and platygraphella, Nyl. n. sp. 
40. MELASPILEA, Nyland. 
Thallus excessively thin or obsolete. Apothecia as in Artlionia, black, 
superficial ; paraphyses distinct ; spores 8, usually colourless, 1-septate. 
Spermatia straight. 
A small cosmopolitan genus. 
1. M. deformis, Nyland. Thallus white, very thin or obsolete. Apo- 
thecia smallish, rounded or deformed, often confluent into a rugulose mass ; 
border obtuse or 0 ; spores ovoid. — Nyland. Lich. Scand. 263. Opegrapha, 
yreyaria, Ach. 
Northern Island : Auckland, on bark, Knight. (Europe.) 
41. NORMAUDINA, Del. 
Thallus of thin orbicular scales. Apothecia black, closed, with a puncti- 
form aperture, immersed. 
A genus of 2 species. (European and American.) 
1. N. Jungermaimise, Felise.— Coccocarpia ? pulchella, Bab. in El. N. 
Z. ii. 273. Thallus glaucous, tips of the scales reflexed. Apothecia in tuber- 
cles of the thallus ; perithecium black ; epithecium black, prominent ; spores 
oblong-cylindric, usually at most 7-septate. — Nyland. Prodr. Lich. Gall, and 
Alg. 174. 
Northern Island : Bay of Islands, J. I). II. (Europe.) 
42. TRYFETHELITJM, Ach. 
Thallus imperfectly developed or beneath the bark. Apothecia compound, 
many together being immersed in a depressed or elevated imperfect thallus, 
black, thin; spores usually 8, rarely 2 or 4 ; paraphyses slender, mostly 
branching. 
A genus of corticolous, chiefly tropical Lichens. 
1. T. madreporiforme, Eschweiler ; — Bab. in FI. N.Z. ii. 305. Thallus 
