114 
NEW BRITISH LICHENS. 
17. Arthonia paralia. Nyl. — Thallus greyish-brown, thin, con- 
tinuous, rimose, subsmooth (internally with simple eugonidia) ; 
apothecia brown, rotundate, small, somewhat plane, colourless 
within ; spores 8 nfe, colourless, oviform (or subconstricted in the 
middle), 8-4 septate, 0,018-22 mm. long, 0,007 mm. thick; epi- 
thecium reddish ; hypothecium colourless ; hymeneal gelatine 
wine-red (also the spores) with iodine. 
On schistose rocks near the sea, Kylemore (Larbalestier). 
18. Graphis inustula. JVyl. — Thallus milky-white, subrimulose 
(K -p yellowish) ; apothecia in form as in Gr. dendritica less 
evolute, the lirellee c^esio-pruinose, plane, 2-3 cuspidate ; spores (as 
in Gr. sophistica) murali-divided, 0,038-48 mm. long, 0,015-20 
mm. thick (bluish with iodine). 
On the bark of holly, Westport, Mayo (Larbalestier). 
Belongs to the section of Gr. anguina, Mont. 
19. Verrucaria peloclita. Nyl. — Thallus griseous or greyish- 
brown, thin, smooth, areolato-rimulose ; hypothallus none visible ; 
apothecia minute, with the pyrenium black, and above slightly 
prominent, beneath colourless, the ostiole somewhat impressed; 
spores 8 nae, small, oblong, simple, 0,011-15 mm. long, 0,005-6 
mm. thick. 
On calcareous rocks, Kylemore (Larbalestier). 
Allied to V. truncatula, but with thallus and spores somewhat 
different. 
20. Verrucaria devergescens. Nyl. — Subsimilar to V. latebrosa, 
Krb., but with spores lineari-oblong, 0,019-29 mm. long, 0,007- 
0,010 mm. thick. 
On micaceous rocks, Kylemore (Larbalestier). 
Allied to V. cethiobola. 
?1. Verrucaria humicolor. Nyl. — Thallus darkish-umbrine, 
opaque, very thin, continuous (gonidia chroolepoid) ; apothecia 
usually crowded, globoso-jDrominulent, somewhat dark or umbriiie- 
brown (the pyrenium entire, yellowish-brown in thin section, or 
with K orange-red), internally white; spores 8 nse, fusiform, 3- 
septate, 0,024-33 mm. long, 0,004-5 mm. thick. 
On the ground in heaths, near Kylemore (Larbalestier). 
22. Verrucaria sub viridicans. Nyl. — Subsimilar to V. inum- 
brata, Kyi., of which it may be a subspecies with the thallus 
(gonimiose), whitish-green, thin, rugulose, continuous ; spores 
0,046-70 mm. long, 0,024-30 mm. thick. 
On sandstone, in streams, near Kylemore (Larbalestier). 
23. Verrucaria insiliens. Larb. — Thallus greyish, thin, rimoso- 
diffract ; apothecia enclosed in monohymenean pertusarioid,convexo- 
prominent thalline verrucae, colourless, externally above brown and 
somewhat prominent, naked around the pale punctiform epithe- 
cium ; spores 8 nae, colourless, fusiform, 5-7 septate, 0,050-67 
mm. long, 0,011-14 mm. thick; hymeneal gelatine not tinged with 
iodine. 
