102 KNIGHT AND MITTEN ON NEW ZEALAND LICHENS. 



O. PROMiNULA, K. & M. Thallus white, uneven or minutely warty, moderately thick, its 

 substance containing extensive patches of green round gonidia ; apothecia superficial, 

 crowded, suhparallel or disposed in all directions, straight or sometimes curved, closed ; 

 spores elliptical or oblong, 7-septate, measuring from 0-00015 to 0-0008 of an inch. 



Hab. On trees, Auckland. 



This species resembles O. varia ; but the crust is more even and whiter, and the apothecia 



for the most part entirely closed by the more prominent border of the perithecium. 



Pl. XI. fig. 19. a. section of thallus and apothecia ; 6. theca ; c. spores. 



Graphis, Acli. 

 G. coNFiNis, K. & M. Thallus cream-coloured or grey ; apothecia immersed, elongate, 

 wavy, sometimes branched or forked, the ends acute, closed by the inflexed perithecial 

 margin ; perithecium entire below, or dimidiate ; spores 6-8-septate, intermediate 

 spaces transversely oval, measuring from 0-00034 to 0-0011 of an inch. 

 Hab. On the bark of trees, Auckland. 



The paler thallus and narrower and thicker border of the perithecium easily distinguish 

 this from the GrapUs scriptci, Ach., with which it most nearly agrees in the form of its 

 spores, but from which it differs in the generally entire perithecium ("ohich is also closed 

 above), and, as it would appear, in the smaller size of the entire plant. 

 Pl. XI. fig. 20. a. section of the thallus and apothecia; b. theca containing spores. 



FissTJRiNA, Pee. 



F, INSIDIOSA, K. & M. Thallus thick, tmeven, warty, dull green, brownish when dry; 



apothecia crowded, simple or branched, deeply immersed in the thallodal warts, closed, 



their lips slightly paler ; spores in a single series, oval or obovate, yellow, before ma- 



tm-ity with a broad hyaline margin, measuring from 0-00035 to 0-0007 of an inch. 



Hab. On the bark of trees, Auckland. 



In the dried state the thallus is of a dull brownish colour, and it appears to be surrounded 

 by a narrow black border. The apothecia, which are quite tmdistinguishable from the 

 thallus by the naked eye, appear, when magnified, to be but fissvires ; in the more per- 

 fectly developed ones there is seen to be a slightly paler margin, sunk below the surface of 

 the thallus, representing the lips of the lirella ; a transverse section shows no trace of a 

 perithecium, beyond a dark spot in the interior of the substance of the margin of the 

 fissure. The thalamium is opaline, the epithecium brown. 

 Pl. XII. fig. 21. a. section of thallus and apothecium ; b. thecse ; c. spores. 



F. INQUINATA, K. & M. Thallus cartilaginous, polished, ashy-grey or brown, tmeven ; 

 apothecia deeply immersed, elongate, wandering, variously branched and wavy, narrow, 

 almost covered by the darkened border of the thallus ; spores oblong or obovate, yel- 

 low, 3-4-septate, with a narrow hyaline margin, measuring from 0-00040 to 0-00084 

 of an inch. 



Pl. XII. fig. 22. a. section of thallus and apothecium; b. thec^; c. spore. 



