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NEW BRITISH LICHENS. 



Communicated by the Rev. J. M. Crombie, F.L.S., &c. 



The following new species of British Lichens have been recorded 

 by Dr. Nylander, in the "Flora," for 1874, No. 1. 



1. Lecidea perobscura. Nyl.— Thallus black, sub-opaque, thin, 

 or very thin, effuse ; apothecia concolorous, or brownish-black, 

 slightly convex, immarginate, greyish within ; spores 8na3, colour- 

 less, ellipsoid, small, 0,006-8 mm. long, about 0,0035 m.m. 

 thick, paraphyses not discrete, epithecium brownish-inspersed, 

 hypothecium colourless ; hymeneal gelatine bluish with iodine. 



On old fir pales near Killin ^Crombie, August, 1873), but spar- 

 ingly gathered. This species seems allied to L. uliginosa, from 

 which, however, it is sufficiently separated by the above characters. 



2. Lecidea spodiza. Nyl. — Thallus dark-greyish, thin, sub-opaque, 

 minutely granulated, or inspersed with greyish-green minute gra- 

 nules, KC + tawny- red ; apothecia livid-grey or livid-pale, slightly 

 convex, immarginate, colourless within ; spores 8na3, oblong, 

 0,011-17 m.m. long, 0,0025-35 m.m. thick, frequently subcurved, 

 and sometimes obsoletely or spuriously 1-septate, epithecium sordid, 

 paraphyses not very well discrete, hypothecium colourless ; hyme- 

 neal gelatine bluish with iodine. 



On old fir pales about Killin (Crombie, August, 1873). Allied 

 to L. denigrata, but distinct. 



3. Lecidea botryiza. Nyl. — Thallus whitish-green, thin, minutely 

 areolato-rimulose (thence appearing as if minutely appresso-squa- 

 mulose), K — C — ; apothecia brown, superficial, somewhat promi- 

 nent, conglomerated and verucose, dark within; spores 8na3, colour- 

 less, ellipsoid, simple, 0,006-9 m.m. long, 0,0035-45 m.m. thick, 

 paraphyses not discrete, epithecium colourless, hypothecium brown; 

 hymeneal gelatine tawny wine-red with iodine. 



On micaceous rocks of Ben Voirlich (Dr. Stirton). Allied to 

 L. botryocarpa, Nyl., from which it is distinguished by the spores, 

 hypothecium, and other characters. 



4. Lecidea caligans. Nyl. — Thallus fuliginous-black, thin, 

 rugose, diffract, indeterminate; apothecia blackish, plane, obtusely 

 margined, within pale; spores thinly acicular, 0,030-35 m.m. long, 

 0015 m.m. thick ; epithecium colourless, paraphyses not distinct, 

 hypothecium colourless (perithecium somewhat brownish above), 

 hymeneal gelatine wine-red with iodine. 



On maritime rocks, in the island of Alderney (Larbalestier), 

 very sparingly ; allied to L. egemda, but a very distinct species. 



5. Axthonia astroidestera. Nyl.— Nearly similar to A. astroidea, 

 but having the apothecia more distinctly astroid, brownish, spores 

 3-5-septate, usually 4-septate, 0,021-26 m.m. long, 0,007-8 m.m. 

 thick. 



