BACIDIA] LBCIDBAOBJE 159 



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

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

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

 Mudd Man. p. 183 (1861) (excl. hab. on rocks). Lecidea umhrina 

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

 cuesiopruinosa Leighf. Lich. Fl. p. 344 (1871) ; ed. 3, p. 271. 



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



Hah. On trees. — Distr. Bare in W., central and N. England. — 

 B. M. Near Dursley, 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 -f 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; Oromb. in Grevillea xxii. p. 59. 

 L. umhrina subsp. bacilli/era var. incompta Nyl. Lich. Scand. 

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

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



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

 n. 174. 



The apothecia are numerous and 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 minor (Seeoliga, atrosanguinea, 

 var. incompta f. minor Stiz. in Acad. Oses. 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 Eozel, 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, DolgeUy, Merioneth ; Barcaldine, Argyll ; Adare, Limerick ; 

 Dmish, Killarney, Kerry. 



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

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



