42 LECANO-LEOIDEKI [lECIDEA 



Falloch and Black Wood of Rannoch, Terthshiro ; Countesswells 

 Wood, near Aberdeen ; Mar Forest, Braeniar, Aberdeenshire ; llothie- 

 niurchus Woods, Invernessshire. 



Var. P endopella Cromb. in Grevillea i. p. 172 (1873).— 

 Thallus subevanescent. Apothecia naked, black, pale -brownish 

 within ; spores often 2-nucleolate ; hymenial gelatine persistently 

 bright blue with iodine. — Leight. Lich. Fl. ed. 3, p. 261. L. 

 endopella Cromb. in Journ. Bot. ix. p. 178 (1871); Leight. Lich. 

 Fl. p. 301. 



Exsicc. Cromb. n. 84. 



Differs, though perhaps only as a form, in the constantly naked 

 apothecia, and more especially in the colour of the hymenial reaction. 

 The apothecia are numerous and somewhat crowded. 



Hah. On an old fir paling in an upland locality. — B. M. Glen 

 Fender, Blair Athole, Perthshire (the only locality). 



Var. y pithyophila Nyl. Lich. Scand. p. 202 (1861).— Thallus 

 as in the type, but usually in patches. Apothecia naked, convex, 

 rugulose, sordid-bluish within ; hymenial gelatine bluish then 

 sordid-violet with iodine. — Cromb. in Grevillea I. c. & in Journ. 

 Bot. xi. p. 134 (1873); Leight. Lich. Fl. I. c. L. asserculorum 

 var. (^pithyophila Sommerf. Suppl. Fl. Lapp. p. 151 (1826). 



Characterized chiefly by the peculiar colour of the hymenium, 

 which, as observed by Nylander, I. c, is almost as in L. mecelna. 

 The apothecia are subminute and crowded. 



Hab. On old fir palings in upland tracts. — Distr. Local and scarce 

 among the S. and Central Grampians, Scotland. — B. M. Achmore, 

 Killin, and Glen Fender, Blair Athole, Perthshire. 



54. L. moBstula Nyl. in Flora li. p. 344 (1868).~Thallus 

 effuse, thin, flat, subgranulose, dark-greyish (K — , CaCl — ), at 

 times nearly evanescent. Apothecia subminute, plane or convex, 

 immarginate or with obsolete margin, black, colourless within ; 

 hypothecium entirely dark-brown ; epithecium colourless or some- 

 times dark-coloured ; spores ellipsoid, small, 0,007-8 mm. long, 

 0,025-35 mm. thick ; hymenial gelatine pale-bluish then wine- 

 red with iodine. — Cromb. in Journ. Bot. vii. p. 48 (1869), Lich, 

 Brit. p. 69 & in Journ. Linn. Soc. xi. p. 483 (1871); Leight. 

 Lich. Fl. p. 269 ; ed. 3, p. 268. 



Exsicc. Cromb. n. 85. 



Approaches L. turgidula. The apothecia are numerous and 

 generally crowded. The spermogones also are frequent, especially in 

 subathalline specimens ; they are black, punctiform, somewhat 

 prominent, with short sterigmata and oblong spermatia, 0,0040-45 nim. 

 long, 0,0015 mm. thick. 



Hab. On old oak palings in wooded upland situations. — Distr. Very 

 local in S. and W. England, but plentiful where it occurs. — B. M. 

 Billingshm'st, Sussex ; near Lyndhurst, New Forest, Hants. 



55. L. submoestula Nyl. in Flora lix. p. 235 (1876).— Thallus 

 effuse, minutely subverrucose-granulose or subdispersed, greyish 



