BILIMBIA] LECIDEACEiE 133 



occur with oblong, straight or slightlj' arcuate, simple or 1 -septate 

 stylospores 0,014-23 mm. long, 0,004 mm. thick {vide Nylander Lich. 

 Env. Par. Suppl. p. 6 (1897)). 



Hab. On the thallus of species of Peltigera and of Solorina saccata 

 in subalpine tracts. — B. M. Craig Calliach and Ben Lawers, 

 Perthshire. 



74. BILIMBIA De Not. in Giorn. Bot. Ital. ii. p. 190 (1846). 

 Tonlnia Massal. Ric. Lich. p. 107 (1852); Mudd Man. p. 173. 

 (PI. 11.) . 



Thallus minutely squamulose or variously crustaceous, some 

 times obsolete. Algal cells, Protococcus. Apothecia light 

 coloured or dark and carbonaceous, immarginate or with a 

 proper margin only ; spores usually 8 in the ascus, oblong or 

 fusiform, 2- to pluri-septate, usually 3-septate, colourless. 



1. B. caradocensis A. L. Sm. — Thallus effuse, minutely 

 squamulose-granulose, rimose-areolate, pale-greyish- or greenish- 

 olive (K-f- yellow, CaCl + orange-yellow), the squamules adnate, 

 convex, crowded, somewhat rugose, more or less crenulate at the 

 margins. Apothecia very small, innate-sessile, margined, black, 

 the margin thick, flexuose ; hypothecium reddish- or dark-brown ; 

 paraphyses concrete, brown at the apices ; spores ellipsoid-fusi- 

 form, 3-septate, 0,011-15 mm. long, 0,004-5 mm. thick; hy- 

 menial gelatine bluish with iodine. — Lecidea caradocensis Leight. 

 ex Nyl. in Act. Soc. Linn. Bord. ser. 3, p. 383 (1856); Leight. 

 in Ann. Mag. Nat. Hist. ser. 3, xiv. p. 404, t. 9, figs. 6, 7, 10 

 (1864) & Lich. Fl. p. 325 ; ed. 3, p. 344 ; Cromb. Lich. Brit. p. 92. 

 Psora caradocensis Mudd Man. p. 169 (1861) pro parte. 



Exsicc. Leight. n. 160; Cromb. n. 93; Johns, n. 395. 



Externally resembling Lecidea Friesii. It is frequently sterile ; 

 the apothecia when present are numerous and often confluent and 

 difform. The immature spores are sometimes only 1- or 2-septate. 



Hah. On trunks of firs, more frequently on old palings. — Distr. 

 Local but plentiful in S. and central England, rare in N. England. — 

 B. M. Near Lyndhurst, Hants ; Penshurst, Kent ; near Keigate, 

 Surrey ; Hendon and near Mill Hill, Middlesex ; near Highbeach, 

 Epping Forest, Essex ; Chalford, Gloucestershire ; Windsor Great 

 Park, Berkshire ; near Elstree, Herts ; Gopsall and Twycross, 

 Leicestershire ; near Upper Howell, Malvern, Worcestershire ; Caer 

 Caradoc, Shropshire ; Park End, Wark-on-Tyne, Northumberland. 



2. B. aromatica Jatta Syll. Lich. Ital. p. 402 (1900).— 

 Thallus indeterminate, thickish, globulose-squamulose or granu- 

 lose-congested, rugose, greyish- white (K— , CaCl — ). Apothecia, 

 small, subsessile, plane and thinly margined, at length convex and 

 immarginate, black ; hypothecium thick, reddish-brown, reddish- 

 black in thick section ; paraphyses somewhat lax, clavate and 

 dark-greenish-blue at the apices ; spores oblong -cylindrical, 

 simple or thinly 3-septate, 0,013-25 mm. long, 0,004-6 mm. 

 thick ; hymenial gelatine deep-blue then wine-red with iodine. — ■ 



