Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 61 



Stirps 2. Leucobasis Vain. Perithecium parte supe- 

 riore fuligineum obscuratumve, parte inferiore subpallidum. 



Ser. A. Perithecium lateribus anguloso-productis. 

 23. V. latebrosa Koerb. 



Syst. Lich. Germ. (1855) p. 349, Parerg. Lich. 4 Lief. (1863) p. 377; 

 Nyl. Fl. 1877 p. 462; Vain. Lich. Vib. (1878) p. 71. Verrucaria aethiobola 

 var. petrosa Vain. Adj. Lich. Lapp. II (1883) p. 176 (haud Ach.), Lich. 

 Caucas. (1899) p. 338. V. chlorotica Arn. Lich. Tirol XXI (1880) p. 146 

 p.p., XXX (1897) p. 35 p.p. (haud Ach.). 



Exs. Koerb. Lich. Sel. Germ. II (1856) n. 56. — Hepp Flecht. 

 Eur. II (1857) n. 435. Arn. Lich. Exs. (1876) n. 686 a, b, (1876) n. 



686 c, (1881) n. 686 d, (1896) n. 1712, (1897) n. 1712 b. — Norrl. et Nyl. 

 Herb. Lich. Fenn. VIII (1882) n. 397. Arn. Lich. Monac. ( 1893) n. 318. 



Thallus modice incrassatus, continuus aut rimosus, 

 laevigatus, plumbeo-glaucescens aut fumoso-obscuratus vel 

 plumbeo-nigricans aut raro ferruginoso-rufescens (humidus 

 magis obscuratus), leviter nitidus aut opacus, saepe interne 

 obscuratus. Apothecia crebra aut sat dispersa, thallo 

 immersa, demum verrucas formantia depresse conoideas, 

 vulgo 0.4 — O.t mm latas, diu totas strato thallino obductas, 

 basin versus sensim dilatatas, apice demum anguste denu- 

 datas nigricantesque. Perithecium fusco-fuligineum, basi 

 tenuiter dilute fuscescenti-pallidum aut pallidum, subdimi- 

 diatum, late conoideo-hemisphaericum, lateribus saepe par- 

 tim attenuato-productis, ostiolo minuto, margine ostiolari 

 saepe demum leviter prominente. Sporae ellipsoideae 

 oblongaeve, long. O.ou— O.022 (O.012— O.032), crass. O.007 — O.010 

 (—O.015) mm. Gonidia coccomyxoidea (aut forsan chloro- 

 coccoidea), ellipsoidea et partim globosa, membrana tenuis- 

 sima aut tenui. 



Distr. Ad lapides inundatas in rivulis fontinalibus et 

 in littoribus. Karelia austr.: Vanha-Viipuri (Vain.). Tava- 

 stia austr.: Abundanter in Tiirismaa in Hollola (Vain.). 

 Ostrobotnia austr.: Kristina (A. J. Malmgren, „*V. mucosa" 

 in Nyl. Lich. Scand. p. 275). Karelia bor.: Nevala in par. 

 Lieksa (Vain.). Ostrobotnia bor.: Ateroisenlammit in Simo 

 (V. Rasanen). 



