356 J. A. MARTINDALE : NOTES ON BRITISH LICHENS. 



and placodine, or polari-bilocular spores. L. fulgens, on account of its 

 simple spores, and L. teicholyta and Z. Lallavei, from their different 

 aspect, are in no danger of being confounded with any of them. 

 The Placodiiun citrijiiim of Leighton's Lichen Flora belongs to 

 another group, that of Leca7iora ceriiia. 



* Spermatia very minute, Spores ellipsoid or 

 obloiigo-ellipsoid, not' swollen in the middle. 



Lecanora elegans (Link, in Ann. Bot., i, 37, a.d. 1794); Ach., 

 Syn., p. 182; Nyl., Flora, 1883, p. 105. Placodium miniaium, 

 pro parte, Leight, Lich. Flora, 3rd ed., p. 162. 



Exs.— Moug. et Nestl., 354; Schar., 338, 545 ; Hepp., 195 ; 

 Mass., 104; Anz., It. S., 133a. 

 Thallus appressed, laciniate; laciniae radiating, discrete or sub- 

 discrete, linear, "5-1 "5 mm. broad, flexuose, convex, multifid, 

 naked, generally dark orange red, but varying to rich orange 

 yellow above, nearly white below. 

 Apothecia concolorous ; at first concave, afterwards nearly plane, 

 surrounded by a generally perfectly entire border, though 

 apothecia with crenulated borders are not unknown (Nyl., 

 Scand., p. 137). ParapJiyses stoutish, articulated, free, 

 slightly branched near the apex, two or three of the upper- 

 most cells frequently much swollen. Spores ellipsoid, 

 •oii-'oi6 mm. long and •oo6-*oo9 mm. broad. 

 Spermogonia very minute, dark red externally. Spei'viatia borne 

 on arthrosterigmata, straight, '002 --0025 mm. long and 

 •ooo5--ooo8 mm. broad. 

 ^ tenuis (Whinb., Lapp., p. 417, a.d. 181 2); Ach., Syn., p. 183. 

 Placodium elegans var. discreta Mudd, Man., p. loi. 

 Placodium elegans Leight., Lich. Flora, p. 163. 



Exs. — Schar., 481 ; Hepp., 906; Anz., It. S., 133c. 



Differing from the type, which it graduates into, only in 

 its smaller size and in its narrower subfiliform laciniae, 

 which are about -25 mm. broad. 



On alpine and sub-alpine rocks. More particularly a 

 plant of northern regions and high elevations, but descend- 

 ing to lower latitudes and levels. 



Grampian Mountains in Scotland, somewhat rare. Var. 

 tenuis on Whimbold Rocks, New Radnor, Wales (Joshua), 

 and Craig Guie in Scotland (Crombie). 



Leighton joins the miniate forms of tegula}Hs to elegans 

 to form his Placodium miniatu?n. At all events such seems 

 to be the case from the exsiccati he cites under that 

 species. 



Naturalist, 



