97 
NEW BRITISH LICHENS. 
Communicated by the Rev. J. M. Crombie, F.L.S. 
Dr. Nylander has recorded in the “Flora,” 1878, pp. 2 4 1-2 16, 
the following new species of Lichens, which have been detected in 
N. W. Ireland by Mr. Larbalestier : — 
1. Pycnothelia apoda. Nyl. — Thallus white or whitish, thin, 
thinly granuloso-crustaceous (K+ yellow), podetia few, abortive, 
small, erect, ellipsoideo-vesciculose or subgranuliform ; apotkecia 
sessile, often aggregated, rusty-red or red-ochraceous, opaque, 
plain, immargiuate or somewhat convex ; spores fusiformi-oblong, 
O, 007-0,010 mm. long, 0,004 mm. thick; paraphyses moderate ; 
epitkecium reddish-brown ; thecae bluish and then yellowish and 
dark at the apices, with iodine. 
On the ground. Kylemore, Galway. It has been gathered also 
in Central France. 
As observed by Nylander, the spermogones of this Lichen are 
very singular. They usually occur enclosed in the hymenium, 
without any distinct conceptacle, with spermatia slightly arcuate, 
0,008-12 mm. long, 0,0005 mm. thick. 
2. Lecidea demarginata. Nyl. — Apparently a subspecies of 
Lecidea expansa , Nyl., with the thallus whitish or greyish, very 
thin, subleprose, and the apothecia convex. 
On rocks. Kylemore, Galway. It has been gathered also in 
Finland. 
3. Lecidea rusticella. Nyl. — Thallus whitish-ochraceous, thin, 
subleprose; apothecia black, opaque, convex, immarginate, dark 
within; spores 8 nae, suboblong, simple, 0,006-9 mm. long, 
0,0025-35 mm. thick ; paraphyses not discrete ; epithecium and 
hypothecium brown or brownish ; hymenial gelatine bluish, and 
then tawny wine-coloured or reddish wine-coloured, with iodine. 
On rocks. Kylemore, Galway. 
This differs from L. rusticula , Nyl., in the different thallus and 
the smaller spores. 
4. Opegrapha xanthodes. Nyl. — Thallus yellowish or greyish- 
yellow, thin, subsmooth, rimose ; apothecia black, oblong ; epithe- 
cium rimiform ; spores 8 nae, fusiformi-oblong, 3-septate, 0,015-18 
mm. long, 0,005-6 mm. thick; hypothecium (with the perithe- 
cium) blackish ; hymenial gelatine tawny, reddish wine-coloured, 
with iodine. 
On quartzose rocks. Kylemore, Galway. 
The spermatia are straight, 0,004 mm. long, scarcely 0,001 mm. 
thick. 
6. Verrucaria sub inumbrata. Nyl. — Thallus greyish, very thin 
or subevanescent ; apothecia brownish in thalline verruculi ; spores 
0,022-30 mm. long, 0,015-18 mm. thick ; otherwise as in V. in- 
umbrata , Nyl., of which it may be a subspecies. 
On mica-schist. Kylemore, Galway. 
