262 E. A. Vainio, Lecideales. 



21. B. obscurata (Sommerf.) Th. Fr. 



Lich. Arct. (1860) p. 182 (excl. var.), Bot. Not. 1863 p. 108, Lich. 

 Scand. II (1874) p. 372. Lecidea sphaeroides b. obscurata Sommerf. 

 Suppl. Fl. Lapp. (1826) p. 165 (sec. Th. Fr.). L. sabuletorum v. ob- 

 scurata Stizenb. Lee. Sab. (1867) p. 33. Mycobilimbia obscurata Rehm 

 in Rabenh. Krypt. Ascom. (1896) p. 328; Vouaux Bull. Soc. Myc. Fr. 

 (1913) p. 437. Bilimbia fusca Mass. Ric. Lich. Crost. (1852) p. 121. 

 L. sphaeroides *L. sabuletorum i) triplicans Nyl. Lich. Scand. (1861) 

 p. 205. L. sabuletorum v. triplicans Nyl. Lich. Lapp. Or. (1866) p. 151. 

 L. triplicans Nyl. in Norrl. et Nyl. Herb. Lich. Fenn. IV (1875) n. 174, 

 Enum. Lich. Fret. Behr. (1888) p. 24, 65. Bilimbia sphaeroides a. terri- 

 gena (Koerb.) Anzi Lich. Rar. Langob. (1861) n. 166. 



Exs. Koerb. Lich. Sel. Germ. I (1856) n. 14 (in herb. Nyl.). — 

 Anzi Lich. Rar. Langob. V (1861) n. 166 (sec. Stizenb. 1. c). — Arn. 

 Lich. Exs. (1872) n. 504. — Norrl. et Nyl. 1. c. n. 174. — Zwackh Lich. 

 Exs. (1881) n. 685. — Zahlbr. Krypt. Exs. Vindob. VII (1901) n. 656. 



Thallus verruculoso-inaequalis, esorediatus. Apothecia 

 majuscula aut mediocria aut rarius parva, basi bene con- 

 stricta, disco primum piano, demum convexo, fusco nigri- 

 canteve aut rufescente testaceove, baud pruinoso, margine 

 sat crasso, vulgo demum excluso. Hypothecium subpallidum 

 decoloratumve, Hymenium pallidum aut subfuscescens. 

 Sporae fusiformes oblongaeve, apicibus vulgo obtusis, 

 long, vulgo 0.016 — 0.020 ( — O.034), crass. O.ooe — O.oos mm, 

 3-septatae. 



Distr. Supra muscos destructos ad basim rupium 

 saxorumque et truncorum Populi, Salicis capreae et Sorbi, 

 raro etiam ad lignum putridum in silvis et pratis crescit, 

 passim in territorio nostro proveniens. 



F. fusca (Mass.) Vain. L. triplicans f. obscurata Vain. Adj. Lich. 

 Lapp. II (1883) p. 7. 



Thallus vulgo tenuis. Apothecia fuscescentia aut nigricantia. 

 — Est forma maxime distributa hujus speciei. 



Thallus tenuis aut raro sat crassus, cinereo-glaucescens aut raro 

 albidus vel pallido-glaucus, subcontinuus aut dispersus. Apothecia lat. 

 1.2—0.7 ( — 2) mm, margine interdum primum prominente, disco vulgo 

 concolore. Perithecium pallidum aut praesertim in margine rubricoso- 

 fuscescens, ex hyphis radiantibus, sat modice pachydermaticis, conglu- 

 tinatis formatum, cavitatibus O.oois — O.ooi mm latis, oblongis. Hypothecium 

 superne interdum dilutissime fuscescens, inferne late pachydermaticum, 



