172 



. umbrinida Nyi., Fl. 1870 p. 37. Lithoicea umbrinula 

 Arn-, Tirol XXI p. 146. Verrucaria uigrescens Nyi., 

 saltem in Scand. p. 271, secundum determinatines in 

 Mus. Fenn. Synonyma etiam sint: Verrucaria nigre- 

 scens Mass. (Ric. p. 177), V. antiquitatis Flk. (sec» 

 Mass., 1. c), Lithoicea nigrescens Arn. (Tirol XXI p. 

 146), Verrucaria fuscoatra Koerb. (Syst. Germ. p. 341), 

 V. mauroides Schser. (Mass., E.ic. p. 178), V. subni- 

 grescens Nyi. in Stizenb., Lich. Helv. p. 234. Pyre- 

 uula nigrescens Ach. secundum hb. Ach. plantas varias 

 respicit. V. nigrescens Garov., Tent. disp. Verr. I p. 

 20, pr. p. V- striatula /5. acrotella Ach., Lich. Univ. 

 p. 293, pr. p. (specimen e Lusatia sec. hb. Ach.). 



Thallus nigricans vei umbrino-nigricans, tenuis vei 

 mediocris, verruculoso-rugosus vei granuloso-subleprosus, 

 areolato-diffractus vei dispersus. Apothecia parva, circ. 

 0,2 millim. Iata, semi-immersa, amphithecio nigro, co- 

 noideo-hemispheerico, prominulo. Perithecium integrum, 

 nigrum. Paraphyses obsoletae. Sporas 8:nse, siraplices, 

 incolores, oblongaj, longitudine 0,012 (0,009)— 0,020 mil- 

 lim., crassitudine 0,005 — 0,008 millim. Gelatina hy- 

 menialis jodo violascens (ssepe prsecedente glaucescentia 

 levissima). 



In Karelia boreali et regione iufralapponica Ostro- 

 botnise passim; etiam in regione coniferarum mixtarum 

 in par. Kuusamo (velut ad Mäntyjoki) et in Lapponia 

 Sodankylensi (ad Kaaretkoski). xVd saxa granitica et 

 schistosa prsesertim in campis, sed etiam in rivulis 

 crescit. 



- f. macrospora ra. 



Sporis majoribus discrepans, longitudine 0,021— 

 0,026 millim., crassitudine 0,007-0,011 millim. — Ad 

 Riekki in par. Kuusamo legit N. I. Fellman. 



- f. subvirens m. 



Thallus olivaceo-nigricans vei passim olivaceo-fu- 

 scescens, granuloso-rugosus, mediocris vei sat tenuis. 

 V. virentem Nyi, Scand. p. 270, haec forma cum V. 



