LBCANACTIS] LBCANACTACBjE 203 



who points out the affinity of V. aphanes with V. leucocephala ; but 

 the peritheoia are darker in colour ; the spermatia are also much 

 smaller, about 0,005 mm. long and 0,001-2 mm. thick. 



Hah. On trunlts of trees. — Distr. Bather rare in S. and N. 

 England and in S. Ireland. — B. M. Dartmoor, Devon ; New Forest, 

 Hants; Henfield, Sussex; Ickworth, Suffolk; Stogdale and Wester- 

 dale, Cleveland, Yorkshire ; Cromaglown, Eagle's Nest and Croghan, 

 Killarney, Kerry. 



Term inerustans Oliv. Exp. Syst. Lich. ii. 1, p. 46 (1900).— 

 Thallus greyish, thicker than in the species.^ — Cyphelium inerustans 

 Ach. in Vet. Acad. Handl. 1817, p. 230, t. 8, f. 6. Lecidea 

 abietina f. inerustans Nyl. Lich. Scand. p. 241 (1861) ; var. 

 inerustans Cromb. in Journ. Bot. xx. p. 275 (1882). 



Sab. Inorusting mosses and hepatics on rooks. — Distr. Eare in 

 S. England. — B. M. Near Eridge, Sussex. 



3. L. illeeebrosa Fr. Syst. Orb. Veg. p. 288 (1825) ; Koerb. 

 Syst. Lich. Germ. p. 277. — Thallus effuse, thin, pulverulent or 

 subgranulose, white (K — , CaCl — ). Apothecia small, black, 

 plane and thinly margined, at length convex and immarginate, 

 white-pruinose, black within ; hypotheoium brownish-black ; 

 paraphyses concrete ; spores fusiform, 1-5-septate ; 0,016- 

 21 mm. long, 0,003-4 mm. thick; hymenial gelatine tawny-wine- 

 reddish with iodine. — Lichen amylaeeus Ehrh. El. Crypt, n. 303 

 (1793), nomen. Opegrapha illeeebrosa Duf. in Journ. Phys. 

 Ixxxvii. p. 213 (1818) (fide Eries). Schismatomma amylaeeum 

 Massal. Ric. Lich. p. 56, f. 103 (1852) ; Mudd Man. p. 222. 

 Lecidea amylacea Nyl. in Act. Soc. Linn. Bord. ser. 3, i. p. 383 

 (1856). L. corticola var. farinosa Ach. Lich. Univ. p. 187 

 (1810). L. farinosa Cromb. Lich. Brit. p. 90 (1870) (excl. 

 subsp.) ; Leight. Lich. El. p. 340 ; ed. 3, p. 365. 



Sah. On old trunks of trees. — Distr. Eare in S. England.^-B. M. 

 Bramble Hill, New Forest, Hants. 



4. L. Dilleniana Koerb. Syst. Lich. Germ. p. 276 (1855).— 

 Thallus effuse, thinnish, soft, granular-areolate, verrucose or 

 wrinkled, greyish-white often somewhat white-pruinose |(K + 

 yellowish, CaCl + orange-yellow). Apothecia rather small, black, 

 appressed, sessile, plane, marginate, white-pruinose or naked, the 

 margin thin, entire, or flexuose ; hypothecium blackish-brown ; 

 paraphyses slender, coherent ; epithecium brownish ; spores 

 narrowly fusiform, 3-septate, 0,023-32 mm. long, 0,005-6 mm. 

 thick ; hymenial gelatine pale-bluish then tawny-wine-red with 

 iodine. — Lichen Dillenianus Ach. Lich. Suec. Prodr. p. 57 t. 1, 

 f. 1 (1798). L. candidus Sm. Engl. Bot. t. 1138 (1803)? (see 

 also p. 137). Lecidea Dilleniana Ach. Meth. p. 55 (1803) ; 

 Leight. Lich. El. p. 332, ed. 3, p. 352 &. in Grevillea ii. p. 172, 

 t. 26, f. 1. L. farinosa subsp. Dilleniana Cromb. Lich. Brit. 



