LECANOR.V.] LECANO-LECIDEEf. 469 



The colour of the thalhis, a-s in other similar instances, depends upon 

 the presence of peroxide of iron in the substratum. In tlie Hiitish speci- 

 mens the apothecia are numerous and at times angulose from niiilual 

 pressure. Only a few spcrmoL'ones are visible, with spermatia 0,004-5 

 mm. lung-, about 0,001 mm. thick. 



Huh. On moist mica-schist rocks in an alpine situation. — Distr. Only 

 on one of the S. Grampians, Scotland. — B. M. : Above Loch-ua-Gat, 

 Een Lawers, Perthshire. 



107. L. recedens Xyl. Flora, 1879, p. 861.— Thallus doterminatc, 

 thick, subveri'ucoso-unequal, rimoso-diflract, grevish (K— , CaCl— , 

 medulla I — ). Ajiotliccia small, innate, brownish-black, colourless 

 within ; the thalliiie margin slightly prominent ; spores Sntc, sub- 

 globose or ellipsoid, 0,009-14 mm. long, 0,007-9 mm. thick ; para- 

 physes thick, jointed ; epithecium brownish ; hymenial gelatine 

 slightly bluish, then wiue-red with iodine. — Cromb. Grevillea, xix. 

 p. 57. — Lecidea recedens Tayl. in Mack. El. Hib. ii. (iSutJ) p, 117. 

 Lecanora subcinerea Xyl. Flora 1SG9, p. 82 ; Cromb. Jouru. Bot. 

 1875, p. 140 ; Leight. Lich. Fl. ed. 3, p. VJ7.—Brit. Exs. : Larb. 

 Lich. Hb. n. 299 (macrior). 



Well distinguished from the allied species by the subglobose spores 

 and the articulate paraphyses. It approaches L. cinereorufescens, but 

 from this it differs also in the thicker thallus, the negative reaction of the 

 medulla with iodine, and the shorter spores. Our British specimens are 

 for the most part well fertile. Though describing it as a Lecidea, Taylor 

 /. c. says that it is allied to Urceolaritc cinerea. 



Hub. On rocks in maritime and mountainous districts. — Distr. Only in 

 N. Wales, N. England, and W. Ireland.— B. M. : Llyu Bodlyn, IBar- 

 mouth, 3Ierioneth ; Hohvick Scar, Yorkshire. Dunkerrou, co. Keny j 

 Den-yclare, Connemara, co. Galway. 



168. L. pelobotrya Somm. Lapp. Suppl. (1826) p. 99 : Xyl. Lich. 

 Scand. p. 155. — Thallus determinate, tartarcous, thickish, arcolato- 

 yerrucose, the verructe gibbose or somewhat plane, smooth, crowded, 

 whitish (K — ,CaC'l— ). Apothecia moderate, plane, slightly im- 

 mersed in the areolte, brownish-black ; the thallinc margin rather 

 thick, inflexed; spores 4-8uae, ellipsoid or oblongo-ellipsoid, 

 0,023-35 mm. long, 0,012-16 mm. thick; hypothecium brownish- 

 black or blackish ; paraphyses slender ; hymenial gelatine bluish 

 with iodine. — Leight. Lich. Fl. ed. 3, p. 195. — AspicUla jJelohotnja 

 Mudd, Man. p. 164. Lecidea j)elobotri/a Cromb. Lich. Brit. p. SO ; 

 Leight. Lich. Fl. ed. 1 , p, 298. Urceolaria jjtlohotrvon Wahl. in 

 Ach. Meth. SuppL (1803) p. 31. 



A rather peculiar species of this section, which from the dark hypo- 

 thecium might be taken for a Lecidea. The distinct thalline margin, how- 

 ever, of the apothecia in well-developed specimens shows that it is a true 

 Leca/iora. The thallus, which has a whitish evane.-ceut hvj)Othallus, is 

 at first plane and continuous, becoming at length thickish and verrucosa, 



