NEW BRITISH LICHENS. 
29 
On calcareous and schistose rocks in a cave at Kylemore. Be- 
longs probably to the section of L. cupreorosella , but the spermogones 
not seen. 
4. Lecidea alabastrites . Nyl. — Thallus whitish or greenish- 
white, very thin, continuous or thin, minutely subgranulose ; apo- 
thecia whitish, somewhat plane, margined (the margin scarcely 
prominent, obsoletely paler), colourless within ; spores 8 nae, fusi- 
form, 3-5 septate, 0*018-24 mm. long, 0*005-7 mm. thick, para- 
physes not discrete, epithecium and hypothecium colourless. Hy- 
menial gelatine, bluish with iodine, and then (especially the thecas) 
dark wine-coloured. 
Amongst mosses on the bark of trees at Kylemore. Allied to 
L. sphceroides. 
5. Lecidea perustula. Nyl. *— Thallus pale, minutely areolate, 
areolae plane, innate, somewhat scattered on a black thin hypo- 
thallus, which is at length minutely areolato-rimose, smooth, de- 
terminate ; apothecia black, innate, somewhat plane ; spores 8 nae, 
colourless, oblongo-ellipsoid, 0*006-8 mm. long, 0*003 mm. thick, 
paraphyses not verv well discrete, epithecium bluish-brown, hypo- 
thecium brown. Hymenial gelatine, at first slightly bluish and 
then tawny wine-red with iodine. 
On siliceous rocks. Kylemore. A minute species, belongingto 
the section of L. fumosa. 
6. Chiodecton subdiscordans. Nyl. — Thallus whitish, thin, sub- 
granuloso-continuous ; apothecia black, simple or at length divided, 
on pulvinato-plane, rotundato-oblong, or subdeformed stromata ; 
spores 8 nae, oblong, 3-septate, 0*011-16 mm. long, 0*0035 mm. 
thick (thicker at the upper apex), paraphyses not distinct, epi- 
thecium somewhat blackish, hypothecium blackish. Hymenial 
gelatine bluish, and then sordid yellow with iodine. 
On moist rocks, near Kylemore. A very peculiar and distinct 
species, most nearly allied to the American Ch. separatum, Nyl. 
7. Arthonia subexcedens. Nyl. — Allied to A. complanata , Fee, 
and scarcely differing except in the constantly rather larger spores ; 
spores oblongo-oviform, 5-6 septate, 0*025-32 mm. long, 0*009-12 
mm. thick, and at length often brownish ; spermatia acicular, 
straight, 0*007 mm. long, 0*0005 mm. thick. 
On the bark of holly, near Kylemore. Perhaps only a sub- 
species of A. complanata. 
8. Verrucaria contur matula. Nyl. — Thallus greyish, maculate ; 
apothecia minute, depressed, subconfluent, the pyrenium dimidiate, 
black ; spores 8 me, ellipsoid or oviformi- ellipsoid (sometimes 
obsoletely 1-septate), 0*011-14 mm. long, 0*005-6 mm. thick, 
paraphyses none. Hymenial gelatine, wine-reddish with iodine. 
On quartzose stones in a rivulet at Kylemore, associated with 
* This has since been ascertained to be Lecidea macula , Tayl., in “ FI. 
Hib.,” which consequently has priority. 
