Acta Societatis pro Fauna et Flora Fennica, 53, N:o 1. 255 



F. epiphaeotera Vain. Epithecium fuligineum aut hymenio toto 

 vel partim sordide subviolascente aut subfuscescente. Locis numerosis. 

 Hae formae valde inconstantes sunt. 



F. decrustata Vain. Thallo evanescente differt a formis praece- 

 dentibus, quae thallo distincto instructae sunt. Locis numerosis. — 

 Hymenium sordide violascens aut forsan etiam colore varians. 



Obs. In specimine ad lignum putridum in Sarkilahti prope 

 Kuopio a K. Linkola collecto supra thallum B. melaenae abundanter 

 crescit alga Nylandera tentaculnta Hariot (Not. Trentepolil. p. 41 in 

 Journ. Bot. 1890). 



17. B. trisepta (Naeg.) Arn. 



Lich. Monac. Exs. (1890) n. 118, Zur Lich. Miinch. (1891) p. 86, 

 (1896) p. 26, Labrador (1896) p. 15. Biatora trisepta Naeg. in Mull. 

 Arg. Princ. Class. Lich. (1862) p. 60. L. sabuletorum f. trisepta Stizenb. 

 Lee. Sabul. (1867) p. 47. Bilimbia milliaria ,S. trisepta Th. Fr. Lich. 

 Scand. II (1874) p. 382. Lecidea trisepta Nyl. Fl. 1875 p. 361. B. sub- 

 viridescens var. trisepta A. Sm. Mon. Brit. Lich. II (1911) p. 144. Non 

 est L. triseptata Hepp in Zolling. Syst. Verzcichn. (1854) p. 9. 



Exs. Hepp Flecht. Eur. I (1853) n. 20, V (1857) n. 284, 285. — 

 Leight. Lich. Brit. Exs. VIII (1856) n. 238. — Zwackh Lich. Exs. (1858) 

 n. 276. — Arn. Lich. Exs. (1861) n. 167 b, (1884) n. 1051. — Rabenh. 

 Lich. Eur. Exs. XXI (1861) n. 582. — Norrl. et Nyl. Herb. Lich. Fenn. 

 VII (1882) n. 319. — Arn. Lich. Monac. Exs. (1890) n. 118, (1892) n. 269, 

 270, (1894) n. 357, (1897) n. 482. (Parlim sec. cit.) 



Thallus verruculosus aut parce verrucosus, esorediatus. 

 Apothecia parva, late adnata, hemisphaerica aut rarius sub- 

 globosa, primum depresso-convexa, immarginata, vulgo atra, 

 nuda. Hymenium totum aut epithecium aeruginosum vel 

 caeruleo-aeruginosum. Hypothecium sordide pallidum deco- 

 loratumve aut dilute fuscescenti-pallidum. Sporae oblongae 

 aut fusiformes, apicibus obtusis, 3-septatae, long. O.012 — O.030, 

 crass. 0.005 — O.oo? mm. 



Distr. Supra muscos destructos in lateribus rupium 

 et ad ipsam rupem et ad lignum et corticem vetustum 

 crescens, sat raro vel passim in territorio nostro provenit. 

 Loca specialia sub formis indicata sunt. 



Thallus sat tenuis aut raro crassus, albidus aut cinerascens, 

 verruculis dispersis aut conglomeratis aut contiguis, aut supra 

 hypothallum albidum aut partim caerulescentem inspersus, aut 



