Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 53 



V. viridula (Schrad.) Ach. 



Meth. Lien. Suppl. (1803) p. 16, Lien. Univ. (1810) p. 675; Koerb. 

 Syst. Lich. Germ. (1855) p. 343; Nyl. Lien. Paris (1896) p. 118 p. p.; 

 A. Smith Mon. Brit. Lich. 11(1911) p. 283. Endocarpon viridulum Schrad. 

 Spic. Fl. Germ. (1794) p. 192, tab. 2 f. 4 secund. specim. orig. in herb. 

 Ach.). Verrucaria fuscella <). V. viridula Ach. Lich. Univ. (1810) p. 290. 

 Sagedia viridula Fr. Lich. Eur. Ref. (1831) p. 414 p. p.; Leight. Brit. Ang. 

 Lich. (1851) p. 23, tab. VII f. 3. Verrucaria nigrescens * V. viridula Nyl. 

 Exp. Pyrenoc. (1858) p. 23, Lich. Scand. (1861 ) p. 271. Lithoicea viridula 

 Arn. Lich. Frank. Jur. (Fl. 1885) p. 242. Lichen placothallus Ach. Lich- 

 Suec. Prodr. (1798) p. 18. 



Exs. Hepp Flecht. Eur. I (1853) n. 91. - Nyl. Herb. Lich. Par. II 

 (1855) n. 95. Rabenh. Lich. Eur. Exs. XXXII (1870) n. 875. 



Thallus modice incrassatus aut sat crassus, rimulosus aut areo- 

 lato-diffractus, areolis circ. 2.5— O.s mm latis, contiguis, difformibus, 

 angulosis, sat laevigatis aut raro leviter subverruculoso-inaequalibus, 

 planis, cinereo-glaucescentibus aut impure albidis, opacis, hypothallo 

 indistincto. Apothecia sat crebra aut dispersa, verrucas formantia 

 demum late subconoideas, saepe basin versus sensim dilatatas et ob- 

 scure cinerascentes vel amphithecio thallino plus minusve distincto 

 tenui obductas, vertice plus minusve late denudato nigricante. Peri- 

 thecium subhemisphaericum, 0.4 — O.25 mm latum, fuligineum, integrum, 

 . parte superiore incrassata ealyptram formante et saepe latere partim 

 angulato productove, margine ostiolari conoideo-prominente, ostiolo 

 vulgo parvo. Sporae ellipsoideae oblongaeve, Jong. O.on — O.032 mm" 

 (sec. Hepp), ,,0.035" mm (sec. Leight. Lich. Great Brit. 3 ed. p. 455), 

 crass. O.007 — O.on mm („0.oie — O.017" mm sec. Leight.). 



Distr. In Fennia adhuc non est lecta et specimina Suecica in 

 herb. Nyl. (in Visby a Zetterstedt et in Gotlandia a Stenhammar 

 collecta), hoc nomine a Nyl. derminata, hue non pertinent (conf. 

 Fr. 1. c). 



Haec species a pluribus auctoribus male limitata est. Sub nomine 

 V. viridulae in herb. Nyl. plures species inveniuntur. - Thallus saepe 

 laevigatus, sed in specim. orig. in herb. Ach. pr. p. est leviter verru- 

 culosus, pr. p. laevigatus. 



18. V. Onegensis Vain. (sp. n.). 



Thallus crassus aut sat crassus, areolatus, areolis 1— 

 0.5 mm latis, contiguis aut partim subdispersis, difformibus, 

 angulosis, verruculosis et quasi e verruculis convexis con- 

 natis constantibus, cervinis (aut partim parce pallidioribus), 

 opacis, hypothallo indistincto. Apothecia sat crebra aut 



