Tecidea.'] 
VII. L1CHENES. 
585 
25. Xj. disciformis, Fries. Thallus crustaceous, thin, white, con- 
tinuous, determinate, unequal, often evanescent. Apothecia flat or subcon- 
vex, black, bordered ; spores brown, ellipsoid or oblong, 1-septate, — Nyland. 
Lich. Scand. 236. 
Var. albula, Nylander. 
Northern Island: on quartz rocks, Colenso. 
y. Thallus yellow, crustaceous. 
26. L. geographica, Schcerer. Thallus crustaceous, bright yellow, 
smooth, cracked, tessellated ; areolae edged with black. Apothecia flat, 
black, often confluent; spores brown or black, 3- or more-septate. — Nyland. 
Lich. Scand. 248. 
middle Island : Otago, on rocks, Lindsay. (Cosmopolite in cold regions.) 
27. L. citrinella, Ach. — L. flavo-vire&cens, Fries, Bab. in FI. N. Z. ii. 
301. Thallus crustaceous, thin, bright yellow, continuous. Apothecia ap- 
pressed, black outside and within ; spores acicular. — Nyland. Lich. Scand. 248. 
Northern Island, Colenso, on rocks. (Europe.) 
28. L. pacbycarpa, Bufour. — Biatora, Fries, Bab. in FI. N. Z. ii. 229. 
Thallus leprous, mealy, soft, uneven, greyish-green. Apothecia scattered, 
sessile, brown, with a pale brown, even, smooth border ; spores many-sep- 
tate. — Nyland. Prod. Lich. Gall, and Alger. 118. L. incana, Ach. ; FI. Ant- 
arct. 
Northern Island: on rocks, trees, and banks, Colenso. Lord Auckland’s group, 
on the ground, J. D. H. (Europe.) 
29. L. tuberculosa, Fee , Essai sur Cryptol. des Ecorces Officin. 107. 
t. 27. /. 1. Thallus crustaceous, tuberculate, pale sulphur- coloured, indefi- 
nite. Apothecia scattered, black, flattish ; margin slender, entire, evanescent, 
horny internally; spores many-septate. — Nyland. Enum. 123. 
Northern Island, Colenso, on hark. Lord Auckland’s group, J. B. H. (Tropical 
America, Madagascar, Australia.) 
S. Parasitic species, consisting of Apothecia growing on other Lichens. 
30. L. oxyspora, Nyland. Apothecia black or brown, minute, flat or 
slightly convex, brownish within ; spores fusiform, ellipsoid. — Nyland. Lich. 
Scand. 247. Ahrothallus, Tulasne in Mem. Lich. 116. t. 16. f. 27. 
middle Island : Otago, parasitic on Parmelia conspersa, Lindsay. (Europe, Asia.) 
The following are enumerated in Dr. Lindsay’s Otago catalogue: — L. furfuracea, Pers. ; 
subsimilis, Nyl. ; sabuletorum. Elk. ; trachona, Flot. ; allotropa, Nyl., n. sp. ; rnelanotropa, 
Nyl., n. sp. ; millegrana, Tayl. ; pulverea, Bow. ; leucothalamia, Otagensis, amphitropa, 
and Jlavido-alra, all n. sp. of Nylander ; arceutina, Ach. ; fusco-atra, Ach. ; petraa, Elot. ; 
stellulata , Tayl. ; myriocarpa , DC. ; lenticularis, Ach. ; grossa , Pers. ; and Curreyi, Lindsay 
(a species of Ahrothallus). 
34. GrRAPHIS, Ach. 
Thallus very thin, continuous, often scarcely visible above or below the 
bark on which the plant grows. Apothecia linear, black, simple or forked, 
von. i. 2 q 
