LKCAXORA.] LECANO-LECIDEEI. 389 



moflcrate, often divided at the apices. — Carroll, Journ. Bot. 1805, 

 p. i^88 ; Crorab. Lich. Brit. p. 48 ; Leiglit. Lich. Fl. p. 226, ed. '.i, 

 p. 217. — Zaora nivalis Koerb. 8ert. Sudet. (I8.j;3) p. 1. Lecanora 

 fuscolnteolina Mudd, Man. p. 153. 



Externally resembles L. fuhohitea Nyl., a Scandinavian plant not yet 

 detected in Great Britain, but differs at once in the spores, which with 

 K are seen to be thiidy l-se))tate. Tlie apothecia are usually numerous, 

 crowded, and for the most part biatoroid. 



Hab. On decayed mosses upon rocks and boulders in alpine places. — 

 Distr. Very sparingly on one or two of the S. Grampians, Scotland. — 

 B. M. : Ben Lawers and Ben Cruaclian, Perthshire. 



51. L. tetrasticha Nyl. Flora, 1874, p. 307.— Thallus subdetor- 

 miuate, deplaiiate, thin, areolato-rimose, vitelline or ycUowish- 

 white (K + crimson). Apothecia small, biatorine, at first concave, 

 then plane, thinly margined, or at length subimmarginate, orange- 

 ochraceous (K + purplish) ; spores oblongo-ellipsoid, 4-loeular or 

 3-septate (the transverse loculi retracted), 0,014-18 mm. long, 

 0,006-8 mm. thick.— Cromb. Journ. Bot. 1876, p. 360; Leight. 

 Lich. Fl. ed. 3, p. 224. 



Subsimilar, as noted by Nylander /. c, to subsp. Z. erythrella, but 

 differing in the paler thallus and the different spores. It still more closely 

 resembles L. ochracea, with which it is often confounded, but is widely 

 separated by the spores, wliich ally it to i. Brehissonii (Fee), a South- 

 American plant. The British specimens are well fertile. 



Hab. On calcareous rocks in maritime and upland situations. — Disir. 

 Local in S.W., Central, and N. England, and the S.W. Highlands of 

 Scotland. — B. M. : llsham, Torquay, and near Plymouth, S. Devon ; 

 Cunning Dale, Buxton, Derbyshire ; near Bonsall, Derbyshire ; Malham 

 Tarn, Yorkshire; Levens, Westmoreland. Island of Lismore, Argvle- 

 shire. 



52. L. refellens Nyl. Flora, 1877, p. 458.— Thallus thin, con- 

 tinuous, unequal, greyish, minutely greenish-sorediate (K — ). 

 Apothecia small, plane, pale-reddish ; the thalline margin thin, sub- 

 pulverulent, at length excluded ; epithecium yellowish (K — ) ; spores 

 polari-bilocular, with a longitudinal tube, variable, 0,009-11 mm. 

 long, 0,005-7 mm. thick : paraphyses thiekish. — Cromb. GreviUea, 

 1878, p. Ill ; Leight. Lich. Fl. ed. 3, p. 21'^.— Brit. Exs. : Larb. 

 Lich. Hb. n. 24. 



A singular species of this section, externally not unlike L. Sambuci, 

 distinguished at once from its allies by the absence of any reaction of the 

 epithecium. It is a rather incon.spicuous plant, the thallus being but 

 sparingly visible in the few specimens seen. The apothecia are numerous, 

 becoming at length subbiatorine. 



Hab. On the trunks of ]ioplars in a mountainous district. — Dist?\ Only 

 very sparingly in N.W. Ireland. — B. M. : Near Cleghan, Counemara, co. 

 Gal way. 



