VII. LICHENES. 
580 
\_Lecanora. 
brina, Ehr. ; L. simplex, Dev., and three new species of Nylander’s, viz. L. homologa, 
peloleuca, and thiomela. 
28. URCEOLaRIA, Acharius. 
Thallus crustaceous. Apothecia urceolate; spores 8, brown, septate. Sper- 
mogonia with branched sterigmata ; spermatia cylindric. 
1. U. sc r uposa ? Ach. — Parmelia, Fries; — Bab. in FI. N. Z. ii. 293. 
Thallus greyish- white, rugose, granulated, continuous or areolate. Apothecia 
black, concave, often glaucous ; border thick, incurved, rugose and crenulate ; 
spores 5-septate. — Nyland. Lich. Scand. 176. 
Northern Island, Colenso. (Cosmopolite.) 
Nylander enumerates N. stictica, Krb., as a native of Otago. 
29. PERTUSARIA, De Candolle. 
Thallus crustaceous, continuous, irregularly warted or nearly smooth. 
Apothecia with or without a thalline border, immersed in warts of the 
thallus ; spores 1-8, ellipsoid, large, with a thickish margin, simple. Sper- 
matia acicular. 
A genus of temperate and cold country Lichens, rare in the tropics. 
1. P. sub verrucosa, Nyland. — P. communis, DC. ; — Bab. in FI. N. Z. 
ii. 306. Undescribed. 
Northern Island: on bark and stones, Colenso, Raoul. 
2. P. subglobulifera, Nyland. Undescribed. 
Northern Island, Colenso. 
3. P. cucurbitula, Mont. — Porina, Bab. in FI. N. Z. ii. 306. Thallus 
radiating, orbicular, cream-coloured, warty, beneath filmy-white, silvery. 
Apothecia numerous, small, sessile, prominent, subconfluent, of the same 
colour as the thallus, at first closed, then expanding and margining the 
apiculate nucleus ; nucleus wavy within, at length falling away ; asci large, 
clavate; spores 1-celled. — Mont, in Ann. Sc. Nat. ser. 3. 18, 312. 
Northern Island : on bark, Colenso. (Chili.) 
Dr. Lindsay adds from Otago, P. velata, Turn. ; perrimosa, Nyland. n. sp., and perfida, 
Nyland. n. sp. 
30. THELOTREMA, Ach. 
Thallus thin, crustaceous, continuous. Apothecia on tubercles or warts, 
with a double margin, the external thalline, the internal of the substance of 
the apothecium ; spores large, fusiform, multilocular. 
A large, chiefly tropical genus. 
1. T. lepadinum, Acli. ; — Bab. in FI. N. Z. ii. 294. Crust small, 
cream-coloured ; warts of the apothecia smooth, conical, truncate. Apothecia 
1-2 in a wart, pale brown, with a thin indexed edge. — Nyland. Lich. Scand. 
185. 
On bark of trees throughout the islands, and in Lord. Auckland’s group. (Cosmo- 
politan.) 
Dr. Lindsay enumerates T. monosporum, Nyland., as a native of Otago. 
