90 
NEW BRITISH LICHENS. 
pliyses discrete, nearly moderate ; hymenial gelatine pale-bluish, 
and then tawny-yellow (especially the theca3), with iodine. 
On schistose rocks. Eed Series, Westmoreland (Martindale). 
Allied to L. intercincta, Nyl. 
5. Lecidea c»sio-lepra, Nyl, in Flora, 1881, p. 532. 
Thallus caisious, leprose, soft, thin, effuse, subrimose (K + 
yellow'ish) ; apothecia brown, slightly ciesio-pruinose, with evanes- 
cent thalline margin ; spores 8 nee, colourless, ellipsoid, 1-septate, 
0'009-0‘011 mm. long, 0*004-5 mm. thick, paraphyses nearly 
moderate, inspersed at the apices ; hymenial gelatine pale-bluish, 
the theca3 tawny-yellow, with iodine. 
On sandstone rocks and quartzose soil. Island of Brechou, near 
Sark ( Larbalestier). Belongs to the section of L. cyrtella. 
6. Lecidea aggregatula, Nyl. in Flora^ 1883, p. 101. 
Thallus whitish or greyish-white, minutely granulated, granu- 
lato- aggregated, diffract (K — ) ; apothecia blackish or brownish- 
black, subrugulose, opaque, adnate, plane, immarginate or sub- 
marginate, internally pale ; spores 8 nee, oblong, 0*011-15 mm. 
long, 0*005-6 mm. thick, epithecium brown, paraphyses slender, 
hypothecium colourless ; hymenial gelatine bluish, and then tawmy 
wine-red, with iodine. 
On porphyritic rocks. Charnwood Forest, Leicestershire (Lar- 
balestier). It belongs to the section of Lecidea leucoplicea. 
7. Lecidea tenebrica, Nyl. in Flora, 1882, p. 454. 
Thallus dark-greyish, unequal, areolato- rimose, thinnish, sub- 
determinate ; apothecia black, convex, immarginate, internally 
whitish ; spores 8 me, ellipsoid, simple, 0*010-11 mm. long, 0*005- 
6 mm. thick, paraphyses not well discrete, epithecium and lower 
stratum of hypothecium brown ; hymenial gelatine bluish, and 
then tawny-yellow, with iodine. 
On schistose rocks. Bed Scues, Westmoreland (Martindale). 
Although having the appearance of L. tenebrosa, it belongs rather 
to the section of L. rivulosa. 
8. Lecidea contenebzicans, Nyl. in Flora, 533. 
Thallus dark-greyish or greyish-brown, nearly moderate, 
smoothish, rimoso-diffract, internally white (and with I and K + 
yellow becoming rusty-red) ; apothecia black, somewhat plane, 
margined, internally whitish, the lower stratum dark-brown ; spores 
8 nee, ellipsoid, 0*010-11 mm. long, 0*005-6 mm. thick, epithecium 
dark-bluish, hypothecium reddish-brown ; hymenial gelatine bluish, 
and then tawny-violet (the thecee especially), with iodine. 
On schistose rocks. Bed Scues, Westmoreland (Martindale). 
Though having the appearance of L. tenebrica, this is a very 
distinct species, differing in being larger, with the apothecia 
margined, and in various other characters. 
9. Lecidea coziacella, N\jl. in Flora, 1882, p. 454. 
Thallus dark-grejish, subsmooth, coriaceo-insculpt, thinnish 
but someivhat variable ; apothecia blackish, opaque, innate, im* 
marginate, internally pale ; spores 8 me, ellipsoid, simple, 0*010-12 
