SPILONEMA. | SIROSIPHEI. 21 
while the moneecious fructification, the apothecia,.and the spermogones 
prevent all confusion between them. The apothecia are rarely seen in British 
specimens, though the spermogones are not unfrequent; they are minute 
black tubercules, with sterigmata 4-6-articulate, spermatia 0,002-0,0025 
mm. long, 0,005-0,001 mm. thick. 
Hab. On schistose rocks in maritime and subalpine tracts.—Disér. 
Local and scarce in N. Wales, and the S.W. Highlands of Scotland ; 
though no doubt it will be detected in other similar localities.—B. M. : 
Barmouth, Merionethshire ; Barcaldine, Argyleshire. 
2. §. revertens Nyl. Flora, 1865, p. 601.—Thallus effuse, mi- 
nutely coralloideo-compact, in somewhat small, verruculose pul- 
vinuli, black or brownish-black. Apothecia lecideine, adnate, some- 
what convex, immarginate, black, dark-greyish within; spores 
oblong, simple, 0,008-0,011 mm. long, 0,005-6 mm. thick; para- 
physes thickish, incrassate and denigrate at the apices; hymenial 
gelatine bluish, the apices of the thece deep-blue with iodine.— 
Cromb. Journ. Bot. 1874, p. 331; Leight. Lich. Fl. ed. 3, p. 11. 
In this species the pulvinuli are more or less crowded, and in a young 
or poorly developed state are frequently somewhat discrete. Strosiphon 
saxicola Naeg. in great part is apparently a sterile leprarioid condition 
of this plant. In the only British specimen seen the apothecia are but 
sparingly present. On the thallus of the same specimen pycnides are 
also visible, which are minute, globose, immersed, colourless, with some- 
what curved stylospores. 
Hab. On moist schistose rocks in subalpine districts —Distr. Very 
local and rare, at least in a mature condition, being known only from the 
Central Grampians, Scotland.—B. M.: Craig Tulloch, Blair Athole, Perth- 
shire. 
3. S. scoticum Nyl. Flora, 1869, p. 82.—Thallus effuse, mi- 
nutely coralloid, in small, compact, verrucose, somewhat convex 
pulvinuli, black or brownish-black. Apothecia minute, thinly 
margined, black, epithecium impressed or -slightly convex, vaguely 
obscure, hypothecium colourless ; spores oviformi-oblong, 1-septate, 
0,010-14 mm. long, 0,0045 mm. thick, paraphyses somewhat slender; 
hymenial gelatine bluish, the thece violet with iodine-—Cromb. 
Journ. Bot. 1869, p. 105; Lich. Brit. p. 1; Leight. Lich. Fl. 
p. 12, ed. 3, p. 11. 
The pulvinuli are usually discrete, though occasionally approximate, 
on the crustaceous thalli, or the decayed mosses on which the plant 
occurs. It is closely allied to the preceding, but is well distinguished by 
the apothecia and the spores. The sterile thallus seems to be not un- 
common ; but the apothecia are very rare. As in S. revertens, no sper- 
mogones have yet been detected, so that both species are only temporarily 
placed in Spelonema. 
Hab. On mica-schist rocks, and on dead mosses (also on Sfereo- 
caulon condensatum) in subalpine tracts.—Drstr. Probably not un- 
frequent in the mountainous districts of our Islands, though known only 
from N. Wales, N. England, and the 8. Grampians, Scotland.—B. M.: 
Llyn Aran, Dolgelly, Merionethshire; Teesdale, Durham; Ben Lawers 
and Craig Calliach, Perthshire. 
