352 ADDENDA 



by the more spreading tips. Harmand cites as important the 

 presence in older specimens of white scurfy dots on the podetia, 

 due to the breaking up of the external cortex, a character which 

 is also found in G. rangiferina and C. sylvatica. 0. imjpexa is 

 probably a growth form of the latter. 



Hab. On bare or mossy soil, &e., chiefly in upland regions. — B. M. 

 Killinster Moss, Caithness (collected and determined by D. LUlie). 



Part i. p. 327, affei- 6. proboscidea. 



Gyrophora spodochroa Ach. Meth. p. 108 (1803). — Thallus 

 colourless, ashy-grey or brownish-grey, monophyllous, rigid, 

 moderate in size or large, below pallid-grey, brownish or 

 brownish-black, minutely gi-anular areolate, more or less hirsute 

 and fibrillose. Apotheda plane or somewhat convex, the gyrose 

 Unes almost obsolete, unequally papillate with one larger central 

 papilla ; spores variable, colourless, then brown, ellipsoid, simple, 

 rarely becoming septate, 0,018—29 mm. long, 0,010-18 mm. 

 thick. — Unibilicaria spodochroa Hoffm. Deutsch. Fl. p. 113 (1795). 



Hah. On rocks. — B. M. Lower crags of Langdale .Pikes, West- 

 moreland (collected and determined by J. A. Wheldon and A. Wilson). 



Part i. p. 403, after L. Isidioides. 



Lecanora mougeotioides Nyl. in Flora Iv. p. 364 (1872). — ■ 

 Thallus greenish-yellow or straw-coloured, closely adpressed, 

 radiate-squamulose at the cii'cumference, areolate and warted in 

 the centre with a black prominent hypothallus. Apothecia 

 somewhat depressed, black with a yellowish margin ; spores 

 ellipsoid, 1-septate, dark-brown, 0,010-13 mm. long, 0,005-6 mm. 

 thick. — Bloomfield in Journ. Bot. xlviii. p. 141 (1910). 



Determined by A. Zahlbruckner (Engler & Prantl Pflanzenf. 

 i, 1*, p. 233 (1907)) as a species of Binodina on account of the 

 2-ceIled brown spores, and as synonymous with B. oreina Wainio 

 (Lecanora oreina Ach. Syn. p. 181 (1814) ). Nylander considered it 

 a distinct species on account of the reaction with caustic potash 

 which, in B. oreina, gives no coloration, while in L. mougeoUoides 

 there is a distinct yellowing of the surface and medulla of the thallus. 



Hab. On rocks, Fairlight TJnderoliff, Sussex. 



Part ii. p. 49, after L. rubidula. 



Lecidea pleiospora A. L. Sm. iu Journ. Bot. xlix. p. 41, 

 t. 510, fig. 1 (1911). — Thallus thin, greenish, indistinct, con- 

 sisting of a confused layer of fungal hyphse and algee. Apothecia 

 minute, about 0,250 mm. in diameter, inunarginate, blackish- 

 brown, internally reddish ; hypothecium narrow, brownish- 

 red ; epithecium brownish-red ; paraphyses few, slender, con- 

 glutinate, scarcely visible ; asci oblong-clavate, about 0,075 

 mm. long, 0,012 mm. wide, 12-18-Bpored ; spores globose or 

 slightly irregular in size and form, colourless with a distinct 



