52 LECANO-LECIDEEI [lECIDEA 



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

 throughout the British Isles. — B. M. Ullacombe, near Bovey Tracey, 

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

 Mount Fitchet Park, Sussex ; Bellleigh, 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 ; Cymbychan, 

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

 Yorkshire ; trees on Roman wall, Northumberland ; Falls of Bruar, 

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

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

 mara, Galway. 



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

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

 greyish- or yellowish-groen ; hypothallus indistinct. Apothecia 

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

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

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

 (1855). 



Exsicc. Leight. n. 329. 



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

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



Hab. 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 Frampton, 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. Fl. p. 270; ed. 3, p. 269. 



Hab. On the trunks of trees, rarely on soil. — Distr. Rare 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 Girnac, Braemar, Aberdeenshire ; 

 Applecross House, Ross. 



Yar. elaeochroma 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. elsaocJiroma, Tayl. in Mackay, Fl. 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. 



