LKCANORA.] tECANO-LECIDEEI. 375 



Subsp. 2. L. irrubescens Xyl. Flora, 1874, p. 318.— Thallus 

 effuse, thin, scattered, tawnj-yellow, at times subevanescent. Apo- 

 thccia subminute, biatorine, sessile, becoming convex and immargi- 

 nate, orange-red. — Cromb. Grevillea, xix. p, 60. 



Differs in the characters jriven of the thallus and apothecia. The onlv 

 British specimen ( frajruientary ) is iu lib. .Sahvey .<. n. Lccidcu picta Tayl., 

 which SchareriEnum. p. 149j referred to his var. 8. rubescetis (non Ach.). 

 It is, however, identical with that of Anzi, Licb. min. rar. n. 135, upon 

 which Nylander fuimded this subspecies. 



Hab. On schistose rocks in a mountainous district. — Distr. Seen only 

 very sparingly from N. Wales. — B. M. : Near Barmouth, Merionethshire. 



31. L. crenulatella Xyl. Flora, 1886, p. 461.— ThaUus subeffuee, 

 thin, unequiil, rimose, citrine-coloured (K-1- purple). Apothecia 

 moderate, plane, zeoriue, subconcolorous (K-|-pui"ple), the thalline 

 margin when present finely crenulate; spores ellii^soid, polari-bilo- 

 cular (the loculi moderate), 0,016-20 mm. long, 0,008-9 mm. thick. 

 — Cromb. GreviUea, xviii. p. 45. 



AVell characterized by the double margin of the apothecia. It comes 

 near subsp. L. erijthreUa, but, as Xylander /. c. observes, is scarcely to 

 be subjoined under this. The thallus is little visible in the single speci- 

 men seen, but the apothecia are numerous and occa-ioually crowded. 



Hab. On quartzose rocks in a maritime district. — Distr. Very local 

 and scarce in X."\V. Enj.4aud (Arnside. Westmoreland). 



32. L. ochracea Xyl. in Cromb. Lich. Brit. (1870) p. 46. — 

 Thallus determinate, thinnish, continuous or obsoletely rimoso- 

 areolate, ochrey-yellow (K-f- crimson). Apothecia small, sessile, 

 biatorine, at first concave, then plane, tawny-saffron or orange- 

 coloured (K + purple), the margin thin, paler: spores ellipsoid, 

 polari-bilocular, usually with longitudinal tube, 0,011-12 mm. long, 

 0,0u6-7 mm. thick.— Leight. Lich. Fl. p. 218, ed. 3, p. 208.— 

 CaUopisma ocliraceum Mudd, Man. p. 138, t. 2. f. 43. Lecidea 

 ochracea Schaer. in X'at. Anz. 1819, p. 11. Lecidea icterica Tayl. 

 Lend. Journ. Bot. 1847, p. 150 (fide Leight. I. c). 



Closely allied to L. aurantiaca, but distinguished among other cha- 

 racters by the constantly biatorine apothecia and the smaller spores. 

 The structure of the latter detinitely separates it from L. tetradicha Xyl., 

 to which externally it is almo>t similar and for which it is often 

 mistaken. It is usually limited by a more or less distinct whitish hypo- 

 thallus, aud is always well fertile. 



Hab. On caP-areous rocks iu maritime and upland tracts. — Distr. Very 

 local and rare in S.W. England, S. Wales, the .'S.W. Highlands of Scot- 

 laud, aud f S.W. Ireland. — B. M. : Hope Cove, near Kingsbridge, S. 

 Devon ; Giltar Point, Tenby, Pembrokeshire. Island of Lismore, 

 Argyleshire. 



33. L. fermglnea Xyl. Act. Jx)c. Linn. Bord. ser. 3, t. i. (1856) 

 p. 322. — ThuUus determinate or subeffuse, thinnish, areolato- or 



