Stereocaulon?^ vn. lichenes. 
Northern and Middle Islands: on calcareous rocks, Colenso ; Otago, Lindsay. 
563 
S. denudatum, Flcerke, is enumerated by Babington in the ‘ New Zealand Flora ’ (vol. ii. 
p. 295), but barren. I find no New Zealand specimens in the Herbarium, and Nylauder 
does not allude to it as a native of the islands. S. corticatulum, Nyland., is indicated in 
Lindsay’s list of Otago Lichens. 
9. ARGOPSIS, Theodore Tries. 
Thallus as in Stereocaulon, but glabrous, or with few scattered fibrils and 
granules. Apothecia black, peltate, terminal, dilated, with a delicate thalline 
margin; spores solitary in the asci, large, murally divided. 
A genus of one species, and that a very handsome plant, which Babington suspects may 
prove to be a form of Stereocaulon ramulosum. 
1. A. megalospora, Theodore Fries. — Stereocaulon Argus, FI. Antarct. 
196. t.. 79. f. 2. 1-4. Thallus 1-3 in. high, whitish, stout. — Nyland. Synops. 
Lich. 254. 
Campbell’s Island : on rocks, J. D. H. 
10. THAMNOLIA, Acharius. 
Thallus consisting of erect or prostrate, cylindric or subcompressed, often 
flexuose hollow podetia, which are simple or rarely forked, acute, imperforate, 
white, often rugose. Apothecia unknown. Spermagonia pale as in Bceomyces. 
A genus of one common species, found on moors, etc., and 2 doubtfnl ones. 
1. T. vermicularis, Acli. Thallus chalky- white, 2-4 in. long. — 
Nyland. Synops. Lich. 265. 
Middle Island, Sinclair, on open heathy places. (Europe, N. Asia, Himalaya, Andes, 
Australia.) 
11. USNEA, Hoffm. 
Thallus erect and shrubby or pendulous and branched, pale yellow orgreen- 
ish, terete or angled ; axis solid filiform. Apothecia peltate, with a thalline 
border, terminal or lateral, eoncolorous or black. Spermagonia lateral, with 
simple sterigmata. Spermatia hylindric acicular. 
One of the commonest genera of Lichens in all latitudes. 
§ 1. Apothecia of the same colour as the thallus. 
1. U. barbata, Fries ; — Bab. in FI. N. Z. ii. 268. Thallus white yellow 
pale grey or glaucous, erect or pendulous, long or short, stout or slender.— 
Nyland. Synops. Lich. 267. 
Var .florida. Thallus white, stout, erect, bristly with spreading close-set fibrils. 
Var. dasypoga. Thallus whitish, elongate, pendulous, fibrillose. 
"Var. plicata. Thallus pendulous, not fibrillose. 
Var. articulata. • Thallus white or yellowish, long, branched, fibrillose or not, jointed or 
constricted. Apothecia small. 
Var. ceratina. Thallns erect or pendulous, fibrillous and rough with papillae. 
Var. trichodea. Thallus very slender, filiform, pendulous ; branches sparsely fibrillose. 
Abundant throughout the Northern and Middle Islands. Lord Auckland’s 
group and Campbell’s Island : on trees, rocks, etc. (Cosmopolite.) 
