lecidea] lecideace^ 15 



Hah. On old palings, occasionally on trunks of trees, very rarely 

 ■erratic on sandstone, in lowland and upland situations. — Distr. Some- 

 what rare in England, but plentiful where it occurs. — B. M. Henham, 

 Suffolk ; Hoe Street, Walthamstow, Essex ; Hampstead and near 

 Hendon, Middlesex ; Keston, Kent ; near Reigate, Surre3^ ; Ardingly 

 (saxicolous), Sussex; New Forest, Hants; Totteridge and near Elstree, 

 Herts ; Brentwood, Essex ; Twycross, Leicestershire ; Hay Park, 

 Herefordshire ; near Worcester and Little Malvern, Worcestershire ; 

 Harboro' Magna, Warwickshire ; Haughmond Hill, the Wrekin and 

 Church Stretton, Shropshire ; Westerdale and Stagdale, Cleveland, 

 Yorkshire. 



Yar. /3 myrmecina Nyl. Lich. Scand. p. 243 (1861).— Thallus 

 with the squamules tawny- or chestnut-brown. Apothecia naked. 

 — Lecidea scalaris var. (3 myrmecina Ach. Meth. p. 78 (1803). 



Differs merely in the colour of the thallus and in the constantly 

 naked apothecia. In the single British specimen, which is only very 

 sparingly fertile, the squamules are nearly erect. 



Hab. On a decorticated stump of an old oak in a wooded upland 

 situation. — B. M. Bramble Hill, New Forest, Hants. 



9. L. acutula Nyl. in Flora Ixix. p. 100 (1886).— Thallus 

 ■effuse, thin, granuloso-squamulose, greyish-green or greyish-brown 

 (K — ), the squamules minute, subimbricate, somewhat convex 

 and difform. Apothecia small, thin, black, margined, often 

 ^ngulose and subplicate, the margin thin, somewhat acute ; para- 

 physes subdiscrete ; epithecium and hypothecium olive-brownish- 

 black ; perithecium dark (K -f obsoletely purplish) ; spores 

 fusiform, 0,012-15 mm. long, 0,0025-35 mm. thick; hymenial 

 gelatine not tinged but the asci wine-reddish with iodine. 



Hah. On bark of pine in an upland situation. Found only at 

 Staveley, near Kendal, Westmoreland ; not seen. 



^ 10. L. decipiens Ach. Meth. p. 80 (1803).— Thallus indeter- 

 minate, squamulose, appressed, reddish or pale-flesh-coloured, 

 white beneath ; the squamules more or less discrete, subflexuose 

 or subcrenate, and often whitish at the margins (K — , CaCl — ). 

 Apothecia marginal, adnate, plane or convex, blackish, the margin 

 thin, entire, at length evanescent ; hypothecium pale-brown ; 

 paraphyses concrete, brown towards the apices ; spores ovoid or 

 ellipsoid, 0,012-16 mm. long, 0,005-6 mm. thick; hymenial 

 gelatine bluish with iodine. — Cromb. Lich. Brit. p. 76 ; Leight. 

 Lich. Fl. p. 249 ; ed. 3, p. 240. Lichen decipiens Ehrh. in Hedw. 

 Stirp. Crypt, ii. p. 7 (1789); Dicks. Crypt, fasc. ii. p. 21 ; With. 

 Arr. ed. 3, v. p. 26 ; Engl. Bot. t. 870. Lepidoma decipiens 

 S. F. Gray Nat. Arr. i. p. 462 (1821). Psora decipiens Hook, in 

 Sm. Engl. Fl. v. p. 193 (1833) ; Mudd Man. p. 171. 

 Exsicc. Leight. n. 334, 



Easily recognized by the peculiar colour of the thallus. The 

 squamules are at first discrete and concave, when the plant has 

 much the aspect of a Peziza, but become plane and at length 



