Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 159 



metaplasmate ascorum rubescente. Asci membrana apice parum 

 incrassata. Sporae vulgo distichae, fusiformes aut oblongae 

 ellipsoideaeve, apicibus obtusis aut rotundatis, cellulis demum 

 numerosissimis, septis transversis demum saepe 16, membrana 

 tenui, haud gelatinosa, jodo haud reagentes. Gonidia saepe 

 simplicia. 



Obs. F. octospora (Verrucaria muscicola var. octospora Nyl., 

 Ohlert Zusamm. Lich. Preuss., 1870, p. 43, Stizenb. Ind. Lich. Hyperb., 

 1876, p. 54, Lich. Helv., 1882, p. 252, Vain. Adj. Lich. Lapp. II, 1883, 

 p. 181), sporis p. p. 8:nis dignota, non sit forma systematica. Hue 

 specimina supra citata, ad Lammasjarvi in Kuhmo collecta, pertinent. 



7. Th. coenosa Vain. (n. sp.). 



Thallus tenuis aut sat tenuis, verruculosus, verruculis 

 contiguis aut dispersis, albido- aut glauco- aut olivaceo- 

 cinerascentibus, opacis, hypothallo indistincto. Apothecia 

 sparsa, verrucas formantia hemisphaericas, circ. 0.2 — O.15 mm 

 latas, nigricantes, opacas, nudas, aut p. p. thallo immersa, 

 margine ostiolari haud prominente, ostiolo parvo, haud 

 foveolato. Perithecium superne fuscescens, ceterum late 

 decoloratum. Paraphyses numerosae, simplices aut parce 

 ramoso-connexae. Asci cylindrici. Sporae 8:nae, sub- 

 murales, long. O.026 — O.032, crass. O.007 — O.010 mm. Gonidia 

 pleurococcoidea. 



Distr. Supra muscos putridos (Hedwigidium ciliatum) 



in rupe prope Helsingforsiam (Vain.). Tantum parce 



fertilis. 



Affinis est Thelenellae muscorum, praesertim perithecio 

 minus obscurato et verruculis thalli minoribus ab ea differens. 

 Thallus in lamina tenui partim subcaerulescenti-nigricans. Nucleus 

 albidus, haud resinoso-guttulosus, jodo dilute caerulescens, dein 

 fulvescens. Paraphyses crass. O.0008 — O.0005 mm. Asci long. circ. 

 O.120, crass. O.012 mm, membrana leviter incrassata, metaplasmate 

 ascorum jodo rubescente. Sporae monostichae aut distichae, vulgo 

 fusiformes, apicibus acutis aut raro obtusis, submurales, cellulis 

 irregularibus, haud numerosis, septis transversis vulgo 7 — 10, 

 loculis mediis una septa oblique longitudinali divisis, membrana 

 tenui, haud gelatinosa. Gonidia globosa, vulgo simplicia, diam. 

 O.006 — O.012 mm, raro 2-cellulosa, vulgo membrana tenuissima, 

 interdum etiam modice incrassata, a Pleurococco typico differentia. 



