61 



NEW BRITISH LICHENS. 



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



The following new species of British Lichens have been described 

 by Dr. Win. Nylander, in the " Flora," 11th August, 1872 :— 



1. Obryzum dolichoteron. Kyi.— Parasitic on the lobes of Col- 

 lema auriculatum, var. piuguescens, Nyl. Similar to 0. comiculatum, 

 but with the spores longer, 3-5 septate, cylindrico-oblong, 0,*023 27 

 mm. long, 0,0045-50 mm. thick. On shady calcareous rocks of 

 Craig Tulloch, Blair Athole (Crombie, August, 1870). 



2. Lecidea asemea. Nyl.— Thallus white, thin, unequal, sub- 

 dispersed ; apothecia black or livid-black, margined, often subpli- 

 cate ; spores 8 naa., ellipsoid, 0,013-16 mm. long, 0,006-8 mm. 

 thick, epithecium glaucescent, hypothecium reddish; hymenial 

 gelatine bluish, and then tawny wine-coloured with iodine. On 

 sandstone rocks. Jersey (Larbalestier). Allied to L. sublatypea. 

 Leight. 



3. Lecidea mesotropoides. Kyi.— Thallus externally somewhat 

 similar to that of L. mesotropa, but with the areolae convex 

 (K -f (yellow), medulla I — ) ; apothecia at first plane, margined, 

 at length convex, prominent, immarginate, the lamina thinner than 

 in L. mesotropa, and the spores shorter, 0,009-11 mm. long, 0,006-7 

 mm. thick ; perithecium circuuicingent. Spermogones frequent, 

 scattered over the areolae, with spermatia 0,007-10 mm. long, 

 scarcely 0,001 mm. thick. On calcareous stones of an old wall on 

 Craig Tulloch, Blair Athole (August, 1871, Crombie). 



4. Lecidea subfurva. Kyi. — Thallus brownish-black or greyish- 

 brown, above minutely furfuraceous and opaque, areolato-diffract, 

 indeterminate ( K — ) ; apothecia black, plane, ruguloso-opaque, 

 margined, often angulose, obscure within ; spores 8 nas, colourless 

 subgloboso-ellipsoid, simple, 0,011-12 mm. long, 0,009 mm. thick • 

 paraphyses slender, irregular, indistinct ; epithecium and hypothe- 

 cium obscure ; hymeneal gelatine intensely blue with iodine. On 

 micaceous stones of old walls in Glen Fender and on Craig Tul- 

 loch, Blair Athole (Crombie, August, 1870). Externally some- 

 what resembling L. furvella, but belonging to the section of L. 

 petrosa. 



5. Lecidea confusula. Kyi.— Thallus olive-grey, or bright 

 brownish- grey, thinnish, granulated or granulato-conglomerated 

 the glomeruli dispersed ; apothecia black, adnate, convex, immar- 

 ginate, white within ; spores 8 na?, ellipsoid, simple, somewhat 

 small, 0,007-11 mm. long, 0,0040-45, mm. thick; epithecium 

 yellowish-brown, paraphyses slender, indistinct (visible with K) ; 

 hypothecium colourless. On micaceous stones of an old wall on 

 Craig Tulloch, in Blair Athole (Crombie, August, 1871). 



