STEREOCATJLOK 233 



ish Columbia, Macoun. Alaska, Dr. Kellogg. &, Greenland, 



Vahl, e Th. Fr. 1. c. 1861. Elsewhere in Arctic America, Herb. 

 Hook. Islands of Behring's Straits, Wright. Islands of Cum- 

 berland Gulf, Howgate exp. Summit of Mt. Hood, Hall. 

 Mountains of Mexico, Nylander. 



5. S. denudatum, Floerk. ; podetia smallish and rather 

 slender, loosely, or now often densely eaespitose, and fastigi- 

 ately much branched ; smooth throughout, and naked below ; 

 phyllocladia grayish-white, squamaceous, rounded and crenate, 

 becoming turgid, nodulose, and confluent-irregular ; (cepbalo- 

 dia conspicuous, otherwise much as in the last, but olivaceous- 

 brown, and blackening;) apothecia minute, flat. Spores as in 



the last. Fr. L. E. p. 204. Tuck. Lich. exs. n. 114. Th. Fr. 



Scancl. p. 50. Nyl Syn. 1, p. 247. 



Rocks. Greenland, Dilienius Hist. Muse. 1741. Newfound- 

 land, Despreaux. New Engla'nd, Tuckerman. New Jersey, 

 Austin. Pennsylvania, Dilienius. Alaska, Dr. Kellogg. 



6. S. condensation, Hoffm. ; podetia short, and now deficient, 

 for the most part simple, delicately tomentose; phyllocladia 

 glaucous, verrucose-sub-squamulose passing into blunt branch- 

 lets, densely clothing the podetia ; and collected also at their 

 base into a horizontal crust ; (cephalodia as in the last ; from 

 livid- ash- coloured becoming dark-olivaceous;) apothecia ter- 

 minal; smallish to middling-sized; heaped and confluent; or 



dilated. Spores acicular, 4-locular, ^ mic. Schcer. Enum. 



p. 178. Tuck. Lich. exs. n. 113 (rupicolis excl). Koerb. Syst. 

 p. 13. Th. Fr. Scand. p. 52. 



On the earth in gravelly soil on the coast of Massachusetts, 

 Tuckerman Syn. N. E. 1848. 



7. S. pileatum, Ach. ; podetia short, erect, sparingly, but at 

 length fastigiately branched above ; smooth ; phyllocladia glau- 

 cous and ash- coloured, verruculose, passing into corallinoid 

 branchlets, with all the summits now sorediiferous ; crowded at 

 the base of the podetia into a horizontal crust ; (cephalodia as 

 in the last;) apothecia terminal; middling- siz ed ; pileate. 



Spores obtusely fusiform, 4-locular, J^ mic.^ Lich. Univ. 



p. 582. Th. Fr. Scand. p. 51. 8. cereofus* Schcer. Enum. p. 178. 

 S. cereolinum, Koerb. Syst. p. 14. 8. condensatum pro p. Fr. L. 



