Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 219 



nigricans. Asci oblongoovoideo-ventricosi, basin versus sensim 

 dilatati, long. O.027 — O.030, crass. O.008 mm, membrana modice 

 incrassata. Paraphyses vulgo desunt, at in uno apothecio 2 

 paraphyses vidi, long. circ. O.022, crass. O.0015 mm, simplices. 

 Sporae 8:nae, decolores. — Ab hac specie forsan non differt 

 Microthyrium cetrariae Bres. (Malpighia 1897 p. 62, Vouaux 1. c. 

 p. 213), sporis 1-septatis, long. O.015 — O.ois, crass. O.003 mm 

 descriptum. 



Trib. 3. Perisporieae (Fr.) Vain. 



Perithecium ex hyphis haud radiantibus formatum, 

 clausum, demurn irregulariter fissile. 



Subtrib. 1. Peridieae (Nyl.) Vain. 



Perithecium irregulariter plectenparenchymaticum, tenue, 

 e strato simplice aut rarius subsimplice cellularum forma- 

 tum, fissura vel apertura irregulari submediana aut sublate- 

 rali fissile. Gonidiis instructae aut iis destitutae. 



Ser. 1. Mycoporeae. 



Thallus gonidiosus, crustaceus. Paraphyses evolutae 

 aut. obsoletae deficientesve. Periphyses haud evolutae. Sporae 

 decolores aut fuscescentes, murali-divisae aut septatae. Go- 

 nidia pleurococcoidea aut a Trentepohlia praedita. Inter 

 fungos Cyrtiduleis arete affines. In Fennia nondum collectae. 



Ser. 2. Cyrtiduleae. 



Gonidiis destitutae, ad fungos pertinentes, ceterum 

 Mycoporeis similes. Mycelium haud stroma gonidiosum 

 formans. — Tantum est divisio biologica. 



1. Phaeocyrtidula Vain. 



Genus gonidiis destitutum, ad fungos pertinens. Apo- 

 thecia aggregata aut sparsa, simplicia, nuda. Perithecium 

 obscuratum, irregulariter aut fissuris aperiens. Paraphyses 

 evolutae. Sporae 8:nae, obscuratae, demum murales aut 

 submurales. Nucleus jodo non reagens. 



