402 LICHENACEI. [LECANORA. 



greyish-white, often scarcely visible or entirely obsolete (Kf+ yel- 

 lowish, CaCl ) ; hypothallus indistinct. Apothecia small, lecideoid, 

 thinly margined, at length convex, blackish or dark-brown, whitish 

 within ; spores broadly ellipsoid, 0,016-20 mm. long, 0,010-11 mm. 

 thick ; hymenial gelatine deep blue with iodine. Cromb. Grevillea, 

 xviii. p. 47. Lecidea cequata Nyl. olim, Cromb. Journ. Bot. 1874, 

 p. 149. Lecidea coniops var. B. cequata Ach. Lich. Univ. (1810) 

 P. 171. 



A rather inconspicuous plant, Laving, like others of this section, entirely 

 the appearance of a Lecidea, hut with gonidia intruded into the margin of 

 the apothecia. The single small British specimen is quite typical and 

 well fertile. 



Hub. On granitic rocks in a maritime locality. Distr. Only very 

 sparingly in S.W. England. B. M. : Near Penzance, Cornwall. 



75. L. polyspora Nyl. Not. Sallsk. pro F. et Fl. Fenn. Forh. xi. 

 (1871) p. 182. Thallus determinate, very thin, granulato-verrucose 

 or smoothish, whitish or greyish (K , CaCl ). Apothecia minute, 

 adnate, brownish-black or blackish, at first plane with thin con- 

 colorous or paler margin, then convex and immarginate ; spores 

 12-24nse, oblong or ellipsoideo-oblong, straight or slightly curved, 

 0,013-16 mm. long, 0,006-8 mm. thick ; paraphyses not discrete, 

 yellowish -brown at the subclavate apices. Cromb. Grevillea, xviii. 

 p. 47. Binodina polyspora Fr. fil. Nov. Act. Eeg. Soc. Sc. Upsal. 

 ser. 3, vii. (1861) p. 226. Binodina sophodes Koerb., Mudd, Man. 

 p. 142. 



Looks like a small Lecidea, though, as the apothecia have gonidia in- 

 truded into their margin, it is evidently a Lecanora, as is shown also by 

 the structure of the spermogones. From all the allied species it is well 

 distinguished by the polyspored thecse. 



Hob. On the smooth bark of an alder in a wooded mountainous 

 district. Distr. Only very sparingly on one of the S. Grampians, Scot- 

 land. B. M. : Craig Calliach, Perthshire. 



76. L. iaidioides Nyl. Mem. Soc. Cherb. v. (1857) p. 115. 

 Thallus effuse, thin, subsquamuloso-stellate, whitish or greyish- 

 white ; squamules minute, simple or divided, cylindrical or slightly 

 compressed, isidioid, the divisions often slightly constricted (K + 

 yellowish, CaCl ). Apothecia small or moderate, plane, dull- 

 purplish or brownish-black, the thalline margin tumid, entire or 

 somewhat crenulate; spores oblong or ellipsoideo-oblong, 1-septate, 

 occasionally slightly constricted in the middle, brownish, 0,026-30 

 mm. long, 0,013-15 mm. thick. Cromb. Lich. Brit. p. 49 ; Leight. 

 Lich. Fl. p. 224, ed. 3, p. 214. Borrera isidioides Mudd, Man. 

 p. 106. Parmelia isidioides Borr. Eng. Bot., Suppl. t. 2808. 



A very interesting endemic species, well characterized by the peculiar 

 isidioid, stellate thallus. In its general aspect it looks almost a Physcia, 

 and though placed here by Nylander probably constitutes a distinct 



