402 LICHENACET. [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 wequata Nyl. olim, Cromb. Journ. Bot. 1874, 
p- a. Lecidea coniops var. 8. equata Ach. Lich. Univ. (1810) 
p. 171. 
A rather inconspicuous plant, having, like others of this section, entirely 
the appearance of a Lecidea, but with gonidia intruded into the ee of 
the apothecia, The single small British specimen is quite typical and 
well fertile. 
Hab. On granitic rocks in a maritime locality.—Distr. Only very 
sparingly in 8.W. England.—B. M.: Near Penzance, Cornwall. 
75. L. polyspora Nyl. Not. Sillsk. 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 
12-24ne, 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.—Rinodina polyspora Fr. fil. Nov. Act. Reg. Soc. Sc. Upsal. 
ser. 3, vii. (1861) p. 226. Rinodina 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 thecee. 
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 Nyl. Mém. 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, 0,0138-15 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 maar 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 
