40. 



Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 243 



2°. Thallus evanescens aut calci substrati immixtus. 

 a. Apothecia substrato adnata aut majore parte 

 superiore prominente. 

 5. V. acrotella Ach. Apothecia minutissima, O.is — O.i mm lata. 



9. V. grossa Nyl. Apothecia majora, lat. 0.4 — 0.7 mm. 44. 



/?. Apothecia substrato immersa aut semiimmersa. 



a. Apothecia majora, circ. 0.4 — 0.5 mm lata. 



11. V. Karelica Vain. Thallus lineis hypothallinis cinctus. 46. 



12. V. integra Nyl. Hypothallus indistinctus. 47. 



b. Apothecia minora, circ. 0.2 — 0.3 mm lata. 

 A Sporae majores, long. O.030 — 0.036 mm. 



10. V. devergens Nyl. 45. Sporae long. O.030— O.036 mm. 45. 



AA Sporae minores, long. O.006 — O.027 mm. 

 f Apothecia vertice primum pruinosa. 



13. V. integrella Nyl. Sporae long. O.ois- O.027 mm. 48. 



ft Apothecia haud pruinosa. 



14. V. deversa Vain. Sporae majores, long. O.015 — O.020 (— O.024) 

 mm. 49. 



16. V. pycnosticta Vain. Sporae minutae, long. O.010 — O.ooe mm. 

 51. 



Ser. B. Perithecium lateribus angulato-productis. 

 1°. Thallus inaequalis, bene evolutus. 



O Thallus subtus albidus, hypothallo indistincto. 



17. V. Helsingiensis Vain. Apothecia mediocria, lat. O.35— O.25 

 mm. 52. 



18. V. Onegensis Vain. Apothecia majora, lat. O.e — 0.7 mm. 53. 



OO Thallus subtus nigricans, hypothallo nigro 



confusus. 

 22. V. aractina Wahlenb. Thallus verruculis minutissimis cre- 

 berrimisque instructus. 60. 



2°. Thallus aequalis, bene evolutus. 



19. V. nigrescens Leight. Thallus areolatus, raro sat evane- 

 scens, areolae latere subundulato. 54. 



21. V. maura Wahlenb. Thallus rimuloso-diffractus. 58. 



3°. Thallus tenuissimus aut evanescens. 



20. V. mauroides Vain. 56. 



Stirp. 2. Leucobasis Vain. Perithecium parte supe- 

 riore obscuratum, parte inferiore subpallidum. 61. 



