48S UEV. J. M, CROMBIE ON KEW BRITISH LICUENS. 



but a single specimcji was then gathered, and I have not since 

 succeeded in finding others. It approaches very closely to L, pe- 

 trcea, Flot., but seems sutticiently distinct from all the states of 

 that variable species. 



20. Lecidea PRiECAVENDA, NyL inlitt, ; Cromb. in Seem, Jour.Bot, 

 1869, p. 232. Thallus obscure, thia, scarcely visible, but apparently 

 blackish green : apothecia black, plane, or somewhat concave, mar- 

 gined, small: spores 8 in thecye, faintly blackish, ellipsoid, 1-septate, 

 •014-017 milUm. long, '006-008 millim. thick : paraphyses slender : 

 epithecium obscurely amber-brown, above more intense in colour : 

 hymeneal gelatine blue, and then wine-red with iodine. 



On the decaying wood of an old holly near Lyndhurst in the 

 New Forest, April 1869. Very rare and local, having been found 

 only very sparingly on a single tree. Ny lander observed that it 

 is distinguished from Z. myriocarpa, DC, by the form of the pa- 

 raphyses and the reaction with iodine, and from L. adpressa^ 

 Hepp, by the paraphyses, and the colour of the spores and hypo- 

 thecium. 



21. Lecidea commaculans, Nyl. in Flora, 1868, p. 476. Thallus 

 greyish or brownish black, thin, subareolate, depressed, usually scat- 

 tered, indeterminate, often wanting : apothecia black, small, convex, 

 scarcely margined, concolorous within : spores eight in thecae, colour- 

 less, oblong, •008-011 miUim. long, •003-004 milUm. broad: para- 

 physes not discrete, epithecium blackish, hypothecium thick, reddish 

 brown : hymeneal gelatine blue with iodine. 



On hard felspathic boulders, near the summit of Morrone, in 

 Braemar, August 1868. Apparently rare towards the north-west 

 brow of the mountain ; and from the nature of the rock, speci- 

 mens were with difficulty obtained. It belongs to the group of 

 L. geographical Lin. 



22. Lecidea symphorella, NyL in Flora, 1870, p. 35. Thallus ob- 

 scure, or but slightly visible : apothecia innate, black, minute, convex, 

 immarginate, aggregated in heaps (each of which is composed of seve- 

 ral apotheciaj, concolorous within , spores eight in thecae, colourless, 

 oblong, simple, '010- 018 millim long, '004-007 millim. thick : para- 

 physes of medium thickness, ornot always discrete : epithecium sordid 

 blue or brownish : hypothecium dark brown : hymeneal gelatine and 

 the theca; wine-red, or wine-violet, with iodine. 



On loose calcareous stones amongst detritus on the summit of 

 Morrone, Braemar, August 1869. Apparently rare, and gathered 

 sparingly in only a single spot not far from the Cairn. It is 



