402 LICHENACEI, [lECANORA. 



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

 lowish, CaCl — ) : hypothallus indistinct. Apothecia small, lecideoid, 

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

 within : spores broadly ellipsoid, 0,Ul6-20 mm. long, 0,010-11 mm. 

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

 xviii. p, -17. — Lecidea cequata Xyl. olim, Cromb. Journ. Bot. 1874, 

 p. 149. Lecidea coniops var. /3. cequata Ach. Lich. Univ. (1810) 

 p. 171. 



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

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

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

 well fertile. 



Hab. On gi-anitic rocks in a maritime locahty. — Disfr. Only very 

 sparingly in S."\V. England. — B. M. : Near Penzance, Cornwall. 



75. L. polyspora Xyl. Xot. Siillsk. pro F. et Fl. Fenn. Forh. xi. 

 (1871) p. 1S2. — Thallus determinate, very thin, granulato-verrncose 

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

 adnate, brownish-hlack or blacki.sh, at first plane with thin con- 

 colorous or paler margin, then convex and immarginate ; spores 

 12-24n3e, oblong or ellipsoideo-ohlong, straight or slightly curved, 

 0,013-16 mm. long, 0,0u6-8 mm. thick ; paraphyses not discrete, 

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

 p. 47. — Rinodina polyspora Fr. fil. Xov. Act, Eeg. Soc. Sc. Upsal. 

 ser, 3, vii. (1861) p. 22^^. Rinodina sopliodes Koerb., Mudd, Man. 

 p. 142. 



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

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

 the stnicture of the spennogones. From all the alUed species it is well 

 distinguished by the polyspored thecse. 



Hab. 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. isidioides Xyl. Alem. Soc. Cherh. v, (lSo7) p. 115. — 

 Thallus efi'use, thin, sub.squamuloso-stellate, whitish or greyish- 

 white ; squamules minute, simple or divided, cj'lindrical or slightly 

 compressed, isidioid, the divisions often slightly constricted (K-|- 

 yellowish, CaCl — ). Apothecia small or moderate, plane, duU- 

 purpHsh or brownish-black, the thaUine 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. Pannelia isidioides Borr. Eng. Bot., Suppl. t. 2808. 



A very interesting endemic species, well characterized by the pecuUar 

 isidioid, stellate thaUus. In its general aspect it looks almost a Physcta, 

 and thiiugh placed here by Nylander probably constitutes a distinct 



