STEREOCATJLON.] STEREOCATTLET. 121 



The sorediate apices of the podetia and their branches distinguish this 

 form from the type. In the only fertile British specimen seen the apo- 

 thecia are small and very sparingly present. 



Hah. On rocks and boulders in subalpine regions. Disfr. Local and 

 scarce, having as yet been found only in X. Wales, among the Gram- 

 pians, and in the N.W. Highlands of Scotland, though probably to be 

 detected elsewhere. 13. M. : Cader Idris, Merionethshire. Ben Lawers, 

 Perthshire ; Brae mar, Aberdeenshire : hills of Applecross, Ross-shire. 



/3. pnlvinatum Flot. Lich. Sil. (1842) n. 16 y. Thallus densely 

 pulvinato-coDspitose ; podetia short, fastigiately and intricately 

 branched ; podetial granules turgid, nodulose, crowded. Apothecia 

 small, extremely rare. Cromb. Journ. Bot. 1882, p. 272. Stereo- 

 caulon pascliale e. pulvinatum Schaer. Spic. (1883) p. 274. Stereo- 

 caulon tomentosum var. botryosum Cromb. Lich. Brit. p. 17 ; Leight. 

 Lich. Fl. p. 78, ed. 3, p. 71. Stereocaulon paschale y. alpinum 

 var. botryosum Mudd, Man. p. 66. Stereocaulon botryosum Sm. Eng. 

 Fl. v. p. 233. Brit. E.rs. : Leight.. n. 387. 



In Herbaria frequently confounded with other species, more especially 

 S. alpinum form botryosum, which apparently does not occur in Britain. 

 It is loosely affixed to the substratum, and the granules are sometimes 

 almost crustaceo-confluent. In this country, as elsewhere, it is very 

 rarely seen fertile. 



Hab. On rocks and boulders in subalpine situations. Distr. Rather 

 local in N. Wales, N. England, among the Grampians, Scotland, and in 

 SLW. Ireland. B. M. : Cader Idris, Merionethshire; Llyn Howel and 

 Snowdon, Carnarvonshire ; Teesdale, Durham. Ben Lawers, Craig Cal- 

 liach, Ben Vrackie, and near Loch Eagh, Rannoch, Perthshire ; Morrone 

 and Ben Macdhui, Braemar, Aberdeenshire : Ben Nevis, Inverness-shire. 

 Connor Cliffs, co. Kerry. 



6. Thallus persistent at the base ; podetia subsimple ; cephalodia 

 sessile, glomeruliform or verrucose. 



8. S. condensatum Hoffm. Deutsch. Fl. ii.(1795)p. 130. Thallus 

 rather small ; podetia very short, or almost none, simple or sub- 

 simple, somewhat robust, the axis at first slightly arachnoid and 

 then more or less glabrous ; granules squamulose, csespitosely con- 

 gested at the base, scattered on the podetia, crenulate, glaucous or 

 greyish-white. Apothecia moderate, terminal, at length convex, 

 often confluent, brownish or dark reddish-brown ; spores 3-7-septate, 

 fusiformi-cylindrical, 0,020-36 mm. long, 0,0015-25 mm. thick. 

 Mudd, Man. p. 66 ; Cromb. Lich. Brit. p. 17 ; Leight. Lich. Fl. 

 p. 79, ed. 3, p. n.Brit. Exs. : Mudd, n. 33 ; Leight. n. 295. 



The thallus often spreads extensively, forming an efmse, granulose 

 crust, and the podetia are often almost entirely wanting. The cephalodia 

 are verrucose, dark-greyish, adnate towards the base of the podetia, the 

 gonimia glomerulosely "arranged. The apothecia sometimes occur also on 

 the basal granules, and the spermogones are frequent, with spermatia 

 about 0,005 mm. long, scarcely 0,001 mm. thick. 



Hab. On the ground and on turf-covered walls in maritime, upland, 



