220 CYCLOCARPINE! | PLACODIUM 
t. concilians Nyl. Lich. Scand. p. 145 (1861); var. coneilians 
Cromb. in Journ. Bot. viii. p. 97 (1870); Leight. Lich. Fil. . 
p- 220; ed. 3, p. 209. Lecanora diphyodes Cromb. in Journ. 
Bot. xi. p. 133 (1873) (non Nyl.); Leight. Lich. Fl. ed. 3, p. 213. 
L. concilians Nyl. in Flora lxiii. p. 388 (1880) ; Cromb. Monogr. 
i. p. 377. 
Distinguished by the very dark thallus and apothecia. Gonidia 
are abundant beneath the hypothecium and in the margin of the 
apothecium. 
Hab. On schistose rocks in a maritime region.—B. M. Near Port- 
lethen, Kincardineshire. 
§$ iii. Brasrenta Stizenb. in St. Gall. Ber. Nat. Ges. iii. 
p. 171 (1862) pro parte ; Blastenia Massal. in Flora xxxv. p. 573 
(1852) (as genus). 
Thallus crustaceous; apothecia without a thalline margin ; 
spores polarilocular except in Pl. rupestre. 
Thallus yellowish (K + purple). 
33. Pl. ochraceum Anzi Catal. Lich. Sondr. p. 44 (1860).— 
Thallus determinate, thinly felted, continuous, ochraceous-yellow 
(KK + crimson). Apothecia small, sessile, concave then plane, 
tawny-saffron or orange-yellow, the proper (!) margin ochraceous, 
thin, prominent ; spores variable, ellipsoid or elongate, 1-septate, 
usually polarilocular, 12-15 p long, 5—7 p thick.—Lecidea ochracea 
Scher. in Nat. Anz. 1818, p. 11. JL. icterica Tayl. in Lond. 
Journ. Bot. vi. p. 150 (1847) fide Leighton. Callopisma ochraceum 
Massal. Monogr. Lich. Blast. p. 89 (1853); Mudd Man. p. 138, 
t. 2, fig. 43 (1861). Lecanora ochracea Nyl. ex Cromb. Lich. 
Brit. p. 46 (1870) & Monogr. i. p. 375; Leight. Lich. Fl. p. 218; 
ed. 3, p. 208. 
The margin of the apothecium is practically without alge, so that 
it is more biatorine than lecanorine. Apt to be confused with the 
following species. 
Hab. On caleareous rocks in maritime and inland districts.— 
Distr. Rare in 8.W. England, $8. Wales, S.W. Highlands of Scotland 
and possibly from $.W. Ireland.—B. M. Hope Cove, near Kings- 
bridge, Devon; I. of Lismore, Argyll. 
34. Pl. tetrastichum A. L. Sm.—Thallus subdeterminate, 
thinly felted, continuous, rarely areolate, ochraceous-yellow or 
yellowish-grey (IX + crimson). Apothecia small, sessile, concave 
then plane, tawny-saffron or orange-yellow, the proper (?) margin 
lighter in colour, prominent (IK + purplish) ; spores broadly ellipsoid 
or oblong, 1-septate, polarilocular, the cell-contents massed in the. 
polar loculi, and drawn out in a wide tube almost to the septum, 
or broken up into four portions, 14—20 p long, 6-10 p thick.— 
Lecanora tetrasticha Nyl. in Flora Ilvii. p. 307 (1874); Cromb. 
