52 LECANO-LECIDEEI [lECIDEA 



Hah. On the trunks of trees, and on old palings. — Distr. Common 

 throughout the British Isles. — B. M. Ullaoombe, near Bovey Traeey, 

 Devon ; near Lyndhurst, Hants ; Shiere, Surrey ; Langford, Stansted, 

 Mount Fitohet Park, Sussex ; BelUeigh, near Maldon, Ulting and 

 Hadleigh Wood, Essex ; near Malvern, Worcestershire ; Gopsal Park, 

 Leicestershire; Limekiln Wood, Wrekin, Caer Caradoc and Llany- 

 mynech, Shropshire ; Hart Hill and Matlock, Derbyshire ; Cymbyohan, 

 Dolgelly and Barmouth, Merioneth ; Trefriw, Carnarvonshire ; Basby, 

 Yorkshire; trees on Eoman wall, Northunaberland ; Falls of Bruar, 

 Blair Athole and Glen Ogle, Perthshire ; Barcaldiae, Lome and 

 Appin, Argyll ; Banchory, Aberdeenshire ; Bostellan, Cork ; Conne- 

 mara, Galway. 



Form tabescens Stizenb. in St. Gall. Ber. Nat. Ges. 1882, 

 p. 432. — Thallus effuse, very thin, subleprose or subrimulose, 

 greyish- or yellowish-green; hypothallus indistinct. Apothecia 

 adnate or at times subinnate, convex, immarginate, difform, 

 livid-brown. — L. parasema var. Leight. Lich. PI. ed. 3, p. 269 

 (1879). Biatora tabescens Koerb. Syst. Lich. Germ. p. 203 

 (1855). 

 > Exsicc. Leight. n. 329. 



Differs in the less developed thaUus, the absence of a hypothallus 

 and in the colour of the more or less difform apothecia. 



Hob. On smooth trunks of beech trees in wooded upland tracts.^ — 

 Distr. Seen from only a very few localities in S. and N. England. — 

 B. M. Lyndhurst, New Forest, Hants ;' near Framptoh, Dorsetshire ; 

 Airyholme Wood, Cleveland, Yorkshire. 



Var. flavens Nyl. Lich. Scand. p. 217 (1861). — Similar to the 

 type but the thallus yellow, the apothecia internally whitish, and 

 the hypothecium almost colourless. — Cromb. Lich. Brit. p. 77 ; 

 Leight. Lich. FI. p. 270 ; ed. 3, p. 269. 



Hab. On the trunks of trees, rarely on soil. — Distr. Bare in the 

 southern counties of England and in E. and N. Scotland, not recorded 

 from the Channel Islands or from Ireland. — B. M. Ilsham Valley, 

 Torquay, Devon ; New Forest, Hants ; Windsor Great Park, Berks ; 

 Portlethen, Forfarshire ; Glen Gimac, Braemar, Aberdeenshire ; 

 Applecross House, Boss. 



Var. elseochroma Ach. Meth. p. 36 (1803) pro parte ; Nyl. 

 Lich. Scand. p. 217. — Thallus determinate or subeffuse, thin, 

 yellowish, yellowish-grey or olivaceous. Apothecia black, livid - 

 black, or partly dark-reddish or dark-bluish-green, within 

 greyish- white ; hypothecium pale or yellowish-brown. — Mudd 

 Man. p. 200 ; Cromb. Lich. Brit. p. 77 ; Leight. Lich. Fl. p. 270 ; 

 ed. 3, p. 269. L. elseochroma, Tayl. in Mackay, PI. Hib. ii. 

 p. 119 (1836). L. enteroleuca Ach. Lich. Univ. p. 177 (1810). 

 L. parasema var. enteroleuca Nyl. Lich. Scand. p. 217 (1861) pro 

 parte corticolo ; Mudd Man. p. 201 ; Cromb. Lich. Brit. p. 77. 

 Lichen parasemus Sm. Engl. Bot. t. 1450 (1805). Lichenoides 

 leprosum, &c., Dill. Hist. Muse. p. 126 (1740) pro parte. 



