LEPROCAtTLON.] STEREOCAULIII. ] 23 



30. LEPROCAULON Nyl. e.v Lamy, BuU. Soe. Bot. Fr. t. xxv. 

 (1878) p. 35ii. — Tliallus minute, subpodetiform, subleproso-granu- 

 lose, not bearing ccphalodia, the pseudo-podetia cajspitoscly con- 

 gested, simplish. Apothecia and spermogones unknown. 



This pseudo-<jeuus, containing a single species, separated by Nylander 

 from Stercucaidon, is but a fiuticiilescent Lepraria. It may Ije phaeed 

 here on account of its superficial rese.nbiance to Stercocaulon, to which, 

 however, it is not even allied (vide Flora, 187G, p. 578). 



1. L. nanuin Nyl. ex Lamy, I. c. — Thallus minute, leproso-granu- 

 lose at the base ; granules very small, glaucous-white or subaerugi- 

 nosc ; pseudo-podetia very short, slender, filiform, csespitoso-con- 

 gested, somewhat simple or sparingly divided towards the apices, 

 the branches often subfastigiate, obsoletcly arachnoid, often glabrous 

 (K — ). — Cromb. Grevillea, xv. p. 15. — Stereocaulon nanvm Ach. 

 Meth. (1803) p. 315; Gray, Jiat. Arr. i. p. 411 ; Sm. Eng. Fl. v. 

 p. 233 ; Mudd, Man. p. 67; Cromb. Lieh. Brit. p. 17; Leight. Lich. 

 Fl. p. 80, ed. 3, p. 73. —Brit. Exs. : Larb. Lich. Hb. n. 284. 



" Stereoccmlon namnn is not a Sfereocauhn , hut, so far as 1 have seen in 

 nature, only a Lepraria (Leprocaulou). The thallus is imperfect, and it 

 has no right to be referred to Sfereocaidu7i^' (J^jl&ndLQX in litt.). This 

 view is confirmed by the absence of the yellow reaction with K, charac- 

 teristic of that genus. 



Hah. In crevices of rocks aud 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 Kingshridge and Totness, Devonshire ; La- 

 morna and Helmintou, 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, 

 Forfarshhe ; Falls of Lui, Braemar, Aberdeenshire. Learmont, co. Derry. 



Tribe YI. CLADONIEI NyL Mem. Sec. Cherb. ii. 

 (1854) p. 11 ; Syn. i. (1860) p. 186. 



Thallus foliose, fruticulose or coespitose, erect or ascending, con- 

 sisting of fiistulose 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 iilamentose agglu- 

 tinate longitudinal elements. Apothecia cephalodine or biatorine, 

 typically terminal on the podetia, rarely aflBxed to the leaflets, often 

 aggregate (" symphicarpous "), variously coloured (not black) ; spores 

 8nae, simple, oblong, small, colourless ; paraphyses somewhat short, 

 occasionally bifurcate. Spermogones generally protuberant on the 

 podetia ; sterigmata slender, simple or sparingly branched. 



