LEPROCAULON. | STEREOCAULEI, 123 
30. LEPROCAULON Nyl. ea Lamy, Bull. Soc. Bot. Fr. t. xxv. 
(1878) p. 352.—Thallus minute, subpodetiform, subleproso-granu- 
lose, not bearing cephalodia, the pseudo-podetia cxspitosely con- 
gested, simplish. Apothecia and spermogones unknown. 
This pseudo-genus, containing a single species, separated by Nylander 
from Stereveaulon, is but a fruticulescent Lepraria. It may he placed 
here on account of its superficial resemblance to Stereocaulon, to which, 
however, it is not even allied (vide Flora, 1876, p. 578). 
1. L. nanum Nyl. ev Lamy, l. c.—Thallus minute, leproso-granu- 
lose at the base; granules very small, glaucons-white or suberugi- 
nose ; pseudo-podetia very short, slender, filiform, caespitoso-con- 
gested, somewhat simple or sparingly divided towards the apices, 
the branches often subfastigiate, obsoletely arachnoid, often glabrous 
(K—).—Cromb. Grevillea, xv. p. 15.—Stereocaulon nanum Ach. 
Meth. (1803) p. 315; Gray, Nat. Arr. i. p. 411; Sm. Eng. FI. v. 
p. 233; Mudd, Man. p. 67; Cromb. Lich. Brit. p. 17; Leight. Lich. 
Fl. p. 80, ed. 3, p. 73.—Brit. Exs.: Larb. Lich. Hb. n. 284. 
“ Stereocaulon nanum is not a Stereocaulon, but, so far as I have seen in 
nature, only a Lepraria (Leprocaulon). The thallus is imperfect, and it 
has no right to be referred to Stereocaulon” (Nylander tx hit.). This 
view is confirmed by the absence of the yellow reaction with K, charac- 
teristic of that genus. 
Hab. In crevices of rocks and walls in maritime and mountainous dis- 
tricts.— Distr. Local, though plentiful where it occurs, in the Channel 
Islands, N. Wales, W. and N. England, amongst the Grampians, Scot- 
land, and rare in N.W. Ireland.—B. M.: Boulay Bay, Island of Jersey ; 
Island of Guernsey. Near Kingsbridge and Totness, Devonshire; La- 
morna and Helminton, Cornwall; near Alfrick, Worcestershire; Oswestry, 
Shropshire; Bettws-y-Coed, Carnarvonshire; Aberdovey, Merioneth- 
shire; Teesdale, Durham. Barcaldine, Argyleshire; Balmerino, Fife- 
shire; Glen Lochay, Perthshire; Den of Balthayock and Reeky Linn, 
Forfarshire ; Falls of Lui, Braemar, Aberdeenshire. Learmont, co. Derry. 
Tribe VI. CLADONIEI Nyl. Mém. Soc. Cherb. ii. 
(1854) p. 11; Syn. i. (1860) p. 186. 
Thallus foliose, fruticulose or cespitose, erect or ascending, con- 
sisting of fistulose or subfistulose podetia, with usually a gonidial- 
cortical layer, and generally also of horizontal leaflets or squa- 
mules at the base, sometimes also on the podetia, containing gonidia 
and corticate only above, or very rarely of crustaceous basal gra- 
nules; medullary layer formed principally of filamentose aggln- 
tinate longitudinal elements. Apothecia cephalodine or biatorine, 
typically terminal on the podetia, rarely affixed to the leaflets, often 
aggregate (“ symphicarpous ”), variously coloured (not black); spores 
8ne, simple, oblong, small, colourless ; paraphyses somewhat short, 
occasionally bifurcate. Spermogones generally protuberant on the 
podetia ; sterigmata slender, simple or sparingly branched. 
