LECAKORA.] LECASTO-LECIDEEr. 389 



moderate, often divided at the apices. Carroll, Journ. Bot. 1865, 

 p. 288 ; Cromb. Lich. Brit. p. 48 ; Leight. Lich. Fl. p. 226, ed. 3, 

 p. 217. Zeora, nivalis Koerb. Sert. Sudet. (1853) p. 1. Lecanora 

 fuscoluteolina Mudd, Man. p. 153. 



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

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

 K are seen to be thinly 1-septate. The apothecia are usually numerous, 

 crowded, and for the most part biatoroid. 



Hob. 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 Cruachan, Perthshire. 



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

 minate, deplanate, thin, areolato-rimose, vitelline or yellowish- 

 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-locular or 

 3-septate (the transverse loculi retracted), 0,01418 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 L c., to subsp. L. 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, which ally it to L. Brebissonii (Fe"e), a South- 

 American plant. The British specimens are well fertile. 



Hob. On calcareous rocks in maritime and upland situations. Distr. 

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

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

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

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

 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 thickish. Cromb. Grevillea, 

 1878, p. Ill ; Leight. Lich. Fl. ed. 3, p. 213. 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 inconspicuous plant, the thallus being but 

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

 becoming at length subbiatorine. 



Hob. On the trunks of poplars in a mountainous district. Distr. Only 

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

 Galway. 



