352 ADDENDA 



by the more spreading tips. Harinand 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 C. rmigl/erina and (J. .sylvatica. G. imjjexa is 

 probably a growth form of the latter. 



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

 Killinster Moss, Caithness (collected and detennined by D. Lillie). 



Part i. p. 327, after G. 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 granular areolate, more or less hirsute 

 and librillose. Apothecia plane or somewhat convex, the gyrose 

 lines 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. — Umhilicaria spodochroa Hoffm. Deutsch. Fl. p, 113 (1795). 



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

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



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



Lecanora mougeotioides Ny]. in Flora Iv. p. 364 (1872). — 

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

 radiate-squamulose at the circumference, 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 Pfllanzenf. 

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

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

 {Lecano7'a 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. mougeotioides 

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



Hah. On rocks, Fairlight Undercliff, Sussex. 



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



Leeidea pleiospora A. L. Sm. in Journ. Bot. xlix. p. 41, 

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

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

 minute, about 0,250 mm. in diameter, immarginate, 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-spored ; spores globose or 

 slightly irregular in size and form, colourless with a distinct 



