176 LICHENACEL, [oLaDINA. 
Form 1. tenuis 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. Hxs.: Mudd, Clad. 
n, 58 (vix). 
Has very much the aspect of Cladonia pungens, from which, as well 
as from an analogous form (tenuis Floerke) of C. rangiferina, not yet 
detected in Britain, it differs in the absence of any reaction with K. It 
is from 1 to 14 in. high, and with us occurs only sterile, 
Hab. 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, Kirkeudbrightshire ; 
Rannoch, Perthshire; Sidlaw Hills, Forfarshire ; Glen Nevis, Inverness- 
shire. 
Form 2. lacerata Nyl. ea Nérrl. Medd. Soc. pro F. et Fl. Fenn. 
(1876) p. 14.—Pedetia moderate, very shortly branched, perforate 
or lacerate at the axils.—Cromb. Grevillea, xi. p. 115.—Cenomyce 
sylvatica 6. 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. 
Hab. 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. Nove Galloway, Kirkeud- 
brightshire; Moor of Rannoch, Perthshire; Hills at Nigg, Kincardine- 
shire. 
Var. 3. 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. Evs.; 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 Wally., it holds only a somewhat analogous relation 
to the type as forma gigantea does to the preceding species. It varies in 
length from 8 to 5 in., and occasionally has the podetia very robust and 
less branched. The few British specimens are only sparingly fertile. 
Hab. On the ground in elevated moorlands in mountainous regions.— 
Distr. Sparingly in N. England, 8. 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 Leight. 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, 
