170 LICHENACEr. 



Form 1. tennis Lamy, Bull. Soc. Bot. Fr. t. xxv. (1878) p. 358. 

 Podetia somewhat short, very slender, much and intricately 

 branched. Cromb. Grevillea, xii. p. 92. Brit.Exs.: Mudd, Clad. 



11. 58 (vix). 



Has very much the aspect of Cladonia pimgens, from which, as well 

 as from an analogous form (tennis Floerke) of C. rangiferina, not yet 

 detected in Britain, it differs in the absence of any reaction with K. * It 

 is from 1 to If in. high, and with us occurs only sterile. 



Hob. On the ground in upland situations. Distr. Seen only from a 

 few localities in S. and N. England, and S. and Central Scotland. 

 B. M. : Epping Forest, Essex ; New Forest, Hants ; Kildale Moor, Cleve- 

 land, Yorkshire (atypical). Near Castle Douglas, Kirkcudbrightshire ; 

 Rannoch, Perthshire ; Sidlaw Hills, Forfarshire ; Glen Nevis, Inverness- 

 shire. 



Form 2. lacerata Nyl. ex Norrl. Medd. Soc. pro F. et Fl. Fenn. 

 (1876) p. 14. Podetia moderate, very shortly branched, perforate 

 or lacerate at the axils. Cromb. Grevillea, xi. p. 115. Cenomyce 

 sylvatica S. lacerata Del. in Dub. Bot. Gall. ii. (1830) p. 621. 



The lacerate axils of the rather stouter and shortly branched podetia 

 distinguish this form. The apothecia are rare. 



Hob. In moist sandy places and on moorlands in maritime and upland 

 districts. Distr. Local and scarce in the Channel Islands, S.W. England, 

 S. Scotland, and the Central and N.E. Grampians. B. M. : Quenvais, 

 Island of Jersey. Near Bodmin, Cornwall. New Galloway, Kirkcud- 

 brightshire ; Moor of Rannoch, Perthshire; Hills at Nigg, Kincardine- 

 shire. 



Var. ft. grandis Cromb. Grevillea, xii. (1884) p. 92. Podetia 

 robust, inflato-cylindrical, flexuose, much branched, pale straw- 

 coloured, the branches short, somewhat drooping and brownish at 

 the apices. Cladonia rangiferina var. grandis Florke, Clad. (1828) 

 p. 169 ; Mudd, Brit. Clad. p. 25. Brit. Exs. : Mudd, Clad. n. 60. 



Well distinguished by the much stouter podetia with their shorter 

 branches. Although regarded by some authors as a distinct species s. n. 

 Cladonia arbuscula Wallr., it holds only a somewhat analogous relation 

 to the type as forma giyantea does to the preceding species. It varies in 

 length from 3 to 5 in., and occasionally has the podetia very robust and 

 less branched. The few British specimens are only sparingly fertile. 



Hob. On the ground in elevated moorlands in mountainous regions. 

 Distr. Sparingly in N. England, S. Scotland, and among the Gram- 

 pians. B. M. : Ayton Moor, Cleveland, Yorkshire. Barend Moss, New 

 Galloway, Kirkcudbrightshire ; Sidlaw Hills, Forfarshire ; Rannoch 

 Moor, Perthshire ; Glen Dee, Braemar, Aberdeenshire. 



Form portentosa Lcight. Ann. Mag. Nat. Hist. ser. 3, xviii. 

 (1866) p. 419. Podetia very thick, difform, lacerate, verruculoso- 

 scabrid, very shortly branched, the branches turgid and denticulato- 

 cristate at the apices. Cromb. Lich. Brit. p. 22, Grevillea, xi. 

 p. 115. Cladina sylvatica form portentosa Leight. Lich. Fl. p. 73, 



