LECAXORA.] lt:ca\o-lecidf.f,i. 44!» 



le.icens Cromb. Lich. Brif. p. ')'.]; Lci^ht. Lich. Fl. p. 231, ed. '.i, 

 p. 2-2-3.—BrU. Evs. : Leight. n. 294 ; Mudd, ii. 103. 



Closely allied to the preceding species, but amon» other characters, 

 apart from habitat, separated by the thecae beini? definitely S-sporud, tlio 

 spores themselves beia:; normally straijjlit. Mndl describes the tliallus 

 of his plant, which is evidently only a state, as being leaden-greyisii and 

 pruinose, bjth of which characters disappear in Herbaria specimens. 

 The apothecia are numerous and ajr^:re;^ate, with the margin, wlien per- 

 sistent, at length undulate and angulose from their contiueuce. 



Hah. On old walls in upland situations. — Distr. Very sparingly in "W. 

 and X. England. — B. M. : Preston, near Cirencester, Gloucestershire ; 

 near Marske, Cleveland, Yorkshire. 



Var. p. caeruleorubella Cromb. — Thallus thickish, granuloso- 

 leprose, sordid-greyish or ciesious. Apothecia iiinato-scssUe, scat- 

 tered, reddish or dark-red, the thalline margin whitish, persistent. 

 — Lecnnia cceridescein, var. p. cceraleortibtlla ^udd Man. (lS(il) 

 p. 141. 



Probably a good variety, judging from the two specimens seen. It is 

 characterized by the more pulverulent thallus, the less promin:;nt, more 

 scattered apothecia and their persistent thalline margin, otherwise it is 

 similar to the type. 



Hab. On old walls (arenaceous) in an upland district. — DUfr. 

 Extremely local and scarce in X. England. — B, M. : Xear Ayton, Cleve- 

 land, Yorkshire. 



142. L. dimsra Xyl. Xot. Sallsk. pro F. et Fl. Fenn. F.jrh. xi. 

 (1S71) p. 1S4. — -Thallus effuse, very thin, greyish-white, or scarcely 

 any visible (Kf+yellowish, CaCl — ). Apothecia minute, biatorine, 

 convex, pale- or dark-brownish, naked, the margin thin, evanes- 

 cent; paraphyses not well discrete, brownish at the apices; ejii- 

 thecium K-|-pale rose-coloured: spores Snie, oblong or subellipsoid, 

 1-septate, usually somewhat curved, 0,012-lS mm. long, 0,U04— 6 

 mm. thick ; hymenial gelatine bluish, then wine-reddish or violet 

 with iodine, — Cromb, Grevillea, xviii, p. 70. — Lecanora athroocarjia 

 subsp. dimera Xyl. Lich. Scand. (1861) p. 169. 



Might readily be taken for L. sifringea but for the number of the less 

 divided spores. In the .single British specimen, which is well fertile, 

 the thallus forms small, somewhat scattered maculae on the substratum. 

 The young apothecia are distinctly lecanoriue, but the thalline margin 

 speedily disappears. 



Hab. On the smooth bark of a poplar in an upland district. — Distr. 

 As yet only very sparingly in the X. Grampians, Scotland. — B. M. : 

 Morrone, Braemai", Aberdeenshire. 



143. L. rhypariza Xyl. Ofvers. Tet.-Ak. Forh. 1S60, p. 296; 

 Lich. Scand. p. 109. — Thallus effuse, granulosa or granuloso- 

 squamulose, pale, or pale-lurid-grevish, the granules (or squa- 



2g 



