i)0 LECANO-LECIDEEI [lECIDEA 



156. L. COriacella Nyl. in Flora Ixv. p. 454 (1882).— Thallus 

 effuse, thiiinish or moderate, somewhat smooth, leathery, im- 

 bedded in the rock, greyish-black (K — , CaCl — ). Apothccia 

 submoderate, innate, opaque, immarginate, blackish, pale within ; 

 paraphyses moderate, the epithecium brown ; hypothecium colour- 

 less ; spores ellipsoid, 0,010-0,012 mm. long, 0,006 mm. thick; 

 hymenial gelatine bluish, then tawny wine-red, with iodine. — 

 Cromb. in Grevillea xii. p 90. Specimen not seen. 



Hah. On porphyritic rocks in an upland district in N.W. England 

 (Red Screes, Westmoreland). 



157. L. periplaca Nyl. in Flora Ixv. p. 454 (1882).— Thallus 

 determinate, thin or very thin, smoothish, thinly areolate- 

 rimulose, greyish-black, subbyssoid and applanate-lobate at the 

 circumference. Apothecia small, slightly margined, at length 

 somewhat convex, black, pale within ; paraphyses submoderate ;; 

 epithecium and perithecium brown ; hypothecium colourless ; 

 spores ellipsoid, obtuse at the apices, 0,009-0,010 mm. long, 

 0,006 mm. thick ; hymenial gelatine bluish then deep yellow, the 

 asci wine-reddish, with iodine. — Cromb. in Grevillea xii. p. 81. 

 Specimen not seen. 



Distinguished by the form of the thallus at the circumference,, 

 where it is very thinly or subobsoletely whitish-bordered. The sper- 

 mogones, here and there visible, have the spermatia oblong, 0,003-4 mm. 

 long, 0,0001 mm. thick. 



Hah. On stones of a wall near Stavely, Kendal, Westmoreland. 



158. L. tenebrica Nyl. in Flora Ixv. p. 454 (1882).— Thallus 

 subdeterminate, thinnish, unequal, areolate-rimose, dark-greyish 

 (K — , CaCl). Apothecia rather small, convex, immarginate, 

 black, within whitish ; paraphyses not very well discrete ; 

 epithecium and lower stratum of the hypothecium brown ; spores 

 ellipsoid, 0,010-0,012 mm. long, 0,005-6 mm. thick; hymenial 

 gelatine bluish then tawny-yellow with iodine. — Cromb. in 

 Grevillea xii. p. 90. Specimen not seen. 



Resembles L. griseoatra. The spermogones have the spermatia 

 bacilliform, straight, 0,0035 mm. long, 0,0007 mm. thick. 



Hah. On schistose rocks, Red Screes, Westmoreland. 



159. L. contenebricans Nyl. in Flora Ixvi. p. 533 (1883). — 

 Thallus indeterminate, submoderate, smoothish, rimose-diffract, 

 dark-greyish or greyish-brown, within white, (medulla I + K-f- 

 yellow, then rusty-red). Apothecia large, somewhat plane, 

 margined, black, within whitish (the lower stratum dark-brown) ; 

 epithecium bluish -black (NO3 + violet-red) ; hypothecium reddish- 

 brown ; spores ellipsoid, 0,010-0011 mm. long, 0,005-6 mm. 

 thick ; hymenial gelatine bluish then tawny-violet, especially the 

 asci, with iodine. — Cromb. in Grevillea xii. p. 90. Specimen 

 not seen. 



