bacidia] lecideace^ 159 



Var. polisena Arnold in Flora liv. p. 53 (1871). — Thallus as 

 in the species, Apothecia pallid, leaden-coloured or subolivaceous, 

 usually whitish-pruinose. — Bacidia luteola var. 8 cdesiopruinosa 

 Mudd Man. p. 183 (1861) (excl. hah. on rocks). Lecidea umbrina 

 subsp. polisena Nyl. Lich. Scand. p. 210 (1861). L. effusa var. 

 csesiopruinosa Leight. Lich. Fl. p. 344 (1871) ; ed. 3, p. 271. 



Exsicc. Leight. n. 150; Mudd n. 150. 



Hab. On trees. — Distr. Rare in W., central and N. England. — 

 B. M. Near Diirsley, Gloucestershire ; Broome, Shropshire ; Pirton, 

 near Worcester ; Cleveland and Stagdale, Yorkshire. 



20. B. incompta Anzi Cat. Lich. Sondr. p. 70 (I860).— Thallus 

 effuse, thinnish, granulose - pulverulent, greyish - green (K — , 

 CaCl — ). Apothecia small, adnate or appressed, black or purplish- 

 black, plane and thinly margined, the margin flexuose, at length 

 somewhat convex, difform, and immarginate (K + reddish-violet) ; 

 hypothecium thick, reddish-black ; paraphyses coherent, sordid- 

 reddish ; spores shortly acicular, 1-7- usually 3-septate, 0,015-29 

 mm. long, 0,002-3 mm. thick ; hymenial gelatine pale-bluish then 

 wine-red with iodine. — Mudd Man. p. 184 (^excl. var. atro- 

 sanguinea). Lecidea incompta Borr. in Engl. Bot. Suppl. t. 2699 

 (1831); Hook, in Sm. Engl. Fl. v. p. 180; Leight. Lich. Fl. 

 p. 325 ; ed. 3, p. 345 ; Cromb. in Grevillea xxii. p. 59. 

 L. umhrina subsp. hacillifera var. incompta Nyl. Lich. Scand. 

 p. 210 (1861). L. hacillifera subsp. incompta Cromb. Lich. Brit, 

 p. 74 (1870) (incl. f. minor). 



Exsicc. Leight. n. 162 ; Mudd n. 151 ; Larb. Lich. Hb. 

 n. 174. 



The apothecia are numerous aud sometimes several confluent ; 

 they are well characterized by the reddish colour internally. The 

 thallus is usually well developed, closely covering the inequalities of 

 the bark, but a state has been found growing on wood where it is 

 reduced to a few granules. Form fninor {Secoliga atrosanguinea 

 var. incompta f. minor Stiz. in Acad. Caes. Leop. Nova Acta xxx. 3, 

 p. 20 (1863) ) is distinguished by the finer granules of the thallus 

 and the smaller apothecia. 



Hah. On the trunks of old trees in maritime and upland wooded 

 districts. — Distr. Uncommon in England, though plentiful where 

 it occurs ; rare in Scotland, Ireland, and the Channel Islands. — 

 B. M. Near Rozel, Jersey ; Penshurst, Kent ; Albourne, Sussex ; 

 near Shanklin, I. of Wight ; Lyndhurst, New Forest, Hants ; near 

 Exeter, near Newton Abbot and Ugbrook Park, Devon ; near St. 

 German's, Cornwall ; Albourne, Glynde, Dawny and Wakehurst, 

 Sussex ; Gosfield Hall, Essex ; Thorngate, near Cirencester, Gloucester- 

 shire ; Oswestry, Shropshire ; Wimpole Park, Cambridgeshire ; Gop- 

 sall Park, Leicestershire ; Hindlip and Kempsey, near Worcester ; 

 Nannau, Dolgelly, Merioneth ; Barcaldine, Argyll ; Adare, Limerick ; 

 Dinish, Killarney, Kerry. 



21. B. muscorum Mudd Man. p. 184 (1861).— Thallus effuse, 

 thin, granulose, greyish-white or whitish (K — , CaCl — ). Apo- 



