DESCRIPTIONS OF NEW BRITISH LICHENS. 



TRANSLATED BY JOSEPH A. MARTINDALE. 



Dr. Nylander has recently given, in the current volume of the 

 ' Flora,' p. 100, excellent descriptions of the two new species of 

 Lecidea, whose occurrence in Westmoreland was recorded on p. 49 

 of the present volume of the Naturalist. 

 The following is a translation: — 



LECIDEA OBTURBANS Nyl. 



Thallus cinereous rugose unequal (0-2—0-5 mm - m thickness), 

 limited by the black hypothallus ; apothecia blackish or black, dull, 

 pale within, immarginate convex (0*5 -0-9 mm. diam.), the younger 

 ones margined; spores 8 colourless oblong i-septate, *oio- 11 mm. 

 long by "0035 mm. broad ; paraphyses hardly discrete, epithecium 

 and perithecium dark (nigricant). Hymenial gelatine turning first 

 blue, then vinous red with iodine. 



On clay slate in England, at Winster, not far from Kendal 

 (Martindale). 



A species belonging to a new group, approaching, it would seem, 

 L. bahusiensis Blomb. Spermatia oblong or shortly cylindrical 

 •004 - '0045 mm. long and *ooo6 - 7 mm. thick. Thallus rather 

 loosely affixed, turning yellow both without and within with hyd. of 

 potash. Nitric acid does not change the colour of the epithecium. 



LECIDEA ACUTULA Nyl. 



Thallus cinereo-virescent or cinereo-fuscescent, thin, granuloso- 

 squamulose, squamules minute, subimbricate rather convex, of various 

 shapes; apothecia black, slight (-5 mm. or less in breadth) margined, 

 margin thin, somewhat acute, often angularly subplicate ; spores 

 8 colourless fusiform simple "012-15 mm. long -0025-35 mm. 

 broad; paraphyses free, epithecium, perithecium and hypothecium 

 slightly obscured (fusco-nigrous). Thecae turning vinous red with 

 iodine. 



On fir bark at Staveley, near Kendal, in Western England 

 (Martindale). 



A species belonging to the ostreata group, easily recognised by the 

 above characters. Thallus K - The dark perithecium becomes 

 slightly purpled with hyd. of potash. 



April 1886. 



