STEREOCATJLON.] STEREOCAVLEI. 119 



Distr. General and common in W. and N. England, N. Wales, among 

 the Grampians, Scotland, and in W. Ireland. B. M. : Hay Tor, Widdi- 

 combe, and Wistmain's Wood, Devonshire ; Plvnlimrnon, Cardiganshire ; 

 Cader Idris, Llyn Bodlyn, Dolgelly, and Garth, Merionethshire ; Tees- 

 dale, Durham. ' New Galloway, Kirkcudbrightshire: Appin, Argyle- 

 shire ; Crianlarich, Ben Lawers, and near Loch -Eagh, Rannoch, Perth- 

 shire ; Glen Callater, Braemar, Aberdeenshire ; Loch Linuhe, Inveruess- 

 shire ; near Forres, Elginshire ; Applecross, Ross-shire. Cahir and 

 Blackwater Bridge, co. Kerry ; Conneniara, co. Galway. 



5. S. tomentosum Fr. Sched. Crit. iii. (1824) p. 20 pro parte ; 

 Fr. fil. Comm. Ster. (1857) p. 29. Thallus moderate or somewhat 

 large ; podetia solitary or loosely caespitose, depressed or ascending, 

 rounded, the axis densely tomentoso-arachnoid, divaricately branched, 

 the branches often subdistichous ; podetial granules scarcely any 

 below, crowded above, inciso-crenate, rounded, greenish-white or 

 csesio-greenish. Apothecia small, terminal and lateral, concave, 

 becoming subglobose, brown or dark-brown ; spores 3-, rarely 5-7- 

 septate, fusiformi-bacillar, 0,02237 mm. long, 0,002-3 mm. thick. 

 Mudd, Man. p. 65 ; Cromb. Lich. Brit. p. 17; Leight. Lich. Fl. 

 p. 87, ed. 3, p. 70. Brit. Exs. : Dicks. Hort. Sic. n. 24. 



The podetia, usually somewhat robust, are loosely affixed to the sub- 

 stratum or subfree. The tomentum, by which the plant may generally 

 at once be recognized, becomes more or less evanescent in age. The 

 cephalodia are minute, verrucoso-glonierulose, greyish, sometimes serugi- 

 nose, with the gonimia minute, conglomerate, and for the most part 

 moniliform. The apothecia are rather rare in this country, but the 

 spermogones are more common, with spermatia 0,005-6 mm. long, 0,001 

 mm. thick. 



Hob. Amongst gravel in stony places in maritime and subalpine dis- 

 tricts. Distr. Local and scarce in S., W.,and N. England, the E. coast of 

 Scotland, and here and there among the Grampians. B. M. : Dartmoor, 

 Devonshire ; Helvellyn, Cumberland. Ben Lawers, Perthshire ; Sands 

 of Barrie and Clova Mrs., Forfarshire ; Glen Lui Beg, Braemar, Aber- 

 deenshire ; Ben Nevis, Inverness-shire. 



6. S. alpinum Laur. in Fries, Lich. Eur. (1831) p. 204. 

 Thallus somewhat small ; podetia congested, adherent at the base, 

 erect, the axis thinly tomentose ; podetial granules whitish, verru- 

 cieform and conglomerate, or the lower ones squamulose and inciso- 

 crenate. Apothecia few, usually terminal and dilated, somewhat 

 plane or at length convex, dark-red or brownish-black ; spores as in 

 the preceding. Cromb. Grevillea, xv. p. 15. Stereoeaiiloii tomen- 

 tosvm var. alpinum Cromb. Lich. Brit. p. 17; Leight. Lich. Fl. 

 p. 78, ed. 3, p. 71. Stereocaulon pascliale y. alpimim Mudd, Man. 

 p. 6G.Brit. Exs. : Larb. Lich. Hb. n. 7. 



Though regarded as a variety of S. tomentosum, this seems to be a 

 distinct species. The generally small podetia are more erect and con- 

 gested, with their branches less divaricate ; the granules are whitish, 

 more turgid and verrucoso-conglomerate ; the tomentum, which is whitish 

 and more sparingly present, is at length entirely evanescent; and the 



