NEW BRITISH LICHENS. 
113 
hymeneal gelatine bluish and then tawny wine-coloured with 
iodine. 
On quartzose stones. Summit of Ben-y-gloe, Blair Athole 
(Crornbie, 1876), It is comparable with L. deparcula Nyl., but 
differs in the characters of the thallus, the paraphyses and the re- 
action of the hymeneal gelatine. 
6. Lecidea nigrogrisea. Nyl. — Thallus griseo-greyish, granu- 
lato-areolate, moderate or somewhat thin, the areolate convex, sub- 
shining (K. — , Ca. Cl. — ); apothecia black, plane, thinly mar- 
gined, sufficiently crowded ; spores 8 nse, ellipsohleo-oblong, simple, 
0*007-0*011 mm. long, 0*004-5 mm. thick, paraphyses sub- 
moderate, epithecium and perithecium blackish, hypothecium 
brown ; hymeneal gelatine bluish with iodine, spermatia straight, 
0006-8 mm. long, 0*006 mm. thick. 
On micaceo-schistose stones of a wall, Craig Tulloch, Blair 
Athole (Crornbie, 1876). It most probably belongs to the section 
of L. fumosa. 
7. Opegrapha paraxanthodes. Nyl. — Thallus pale-yellow or 
pale-greenish, thin, subsmooth, minutely areolate- rimose (when 
rubbed bright green) ; apothecia black, oblong or lineari-oblong, 
epithecium rimiform ; spores 8 na3, oblong 5 — usually 4 — septate, 
0*023-25 mm. long, 0*008-9 mm. black; hymeneal gelatine tawny 
wine-reddish with iodine ; spermatia straight, 0*005-7 mm. long, 
0*0006 mm. thick. 
On shady calcareous rocks, Achnanure, Galway (Larbalestier). 
It has entirely the appearance of O. xauthodes Nyl., but differs in 
the character of the spores. 
8. Opegrapha devulgata. Nyl. — Nearly similar to, and perhaps 
a subspecies of, O. vulgata, with spermatia arcuate 0*008-0*012 
mm. long, 0*0005 mm. thick. 
On semiputrid trunks — Airds, Appin, Argyleshire (Crornbie, 
1877). 
9. Opegrapha nothiza. Nyl . — Thallus whitish-griseous, thin, 
somewhat firm, minutely areolate-diffract, hypothallus brownish- 
black, obsolete or evanescent ; apothecia black, oblongo-deformed, 
margined, epithecium plane; spores oblong, 3-septate, 0*015-17 
mm. long, 0*0035-0*0045 mm. thick, paraphyses submoderate. 
Spermatia straight, 0*005 mm. long, 0 0005 mm. thick. 
On quartzose rocks. Island of Jersey (Larbalestier). It is 
allied to 0. grumulosa. 
10. Opegrapha actophila. Nyl.— Thallus greyish, very thin, 
effuse or subevanescent ; apothecia linear (or sublinear), subflexu- 
ose, epithecium rimiform or at length somewhat explanate; 
spores oblongo-fusiform, 5-septate, 0*021-31 mm. long, 0*005-6 
mm. thick ; spermatia straight, bacillar, 0*004-5 mm. long, 0*0005 
mm. thick. 
On maritime felspathic rocks. Island of Jersey (Larbalestier). 
It looks like 0. rimalis saxicole, but it seems to be a distinct species. 
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