Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 201 



(1891) p. 117. Acrocordia tersa Koerb. Syst. Lich. Germ. (1855) p. 356; 

 Jatta Fl. Ital. Crypt. Ill p. 867. Verrucaria gemmata var. minor Garov. 

 et Gib. Tent. Disp. Lich. (1865) p. 73; Nyl. in Malbr. Cat. Lich. Norm. 

 (1870) p. 262. 



Exs. Fr. Lich. Suec. Exs. n. 274 (secundum Arn. Lich. Frank. 

 Jur. p. 267). — Zwackh Lich. Exs. (1850) n. 31 A, B (Arn. 1. c). — 

 Rabenh. Lich. Eur. II (1855) n. 29. 



Thallus tenuis, laevigatus, albidus, hypothallo indistincto. 

 Apothecia partim sat crebra, adnata, verrucas formantia 

 mamillares, 0.4— 0.3 mm latas, nigras, nudas. Perithecium 

 fusconigrum, dimidiatum, margine ostiolari vulgo conoideo- 

 prominente, ostiolo parvo. Asci cylindrici, membrana modice 

 incrassata. Paraphyses numerosae, increbre ramoso-connexae. 

 Sporae monostichae, ellipsoideae, 1-septatae, loculis aequali- 

 bus, long. circ. O.on — O.ois, crass. O.oos — O.009 mm. 



Ad corticem Fraxini et Sorbi. Alandia: Nas prope 

 Pantsarnas in Geta (K. Linkola). Nylandia: Gumtakt ad 

 Helsingforsiam (Vain.), Raseborg (Vain.). 



Tantum apotheciis, ascis et sporis minoribus ab Arthopyrenia 

 gemmata differt. Thallus continuus, leviter nitidus aut opacus, 

 KHO non reagens. Apothecia ad basin praerupta aut sat praerupta, 

 opaca aut leviter nitida. Perithecium fuscescenti-fiiligineum aut 

 rubricoso-fuscescenti-fuligineum (KHO magis obscuratum), basi 

 deficiens. Nucleus albidus, haud resinoso-guttulosus, jodo non 

 reagens, metaplasmate ascorum jodo subrubescente. Asci long. 

 O.090 — O.120, crass. O.oos — O.009 mm. Sporae 8:nae, decolores, 

 apicibus rotundatis aut raro obtusis, membrana laevigata, demum 

 modice incrassata, haud gelatinosa, „long. O.015 — O.017, crass. O.007 

 mm" secundum Arn. (Lich. Munch, p. 117). Gonidia ad Trente- 

 pohliam pertinentia, cellulis anguloso-globosis, O.010 — O.012 mm 

 latis, concatenatis, bene constrictis. 



3. A. glauca (Koerb.) Vain. 



Acrocordia glauca Koerb. Syst. Lich. Germ. (1855) p. 357; Jatta 

 Fl. It. Crypt. Ill (1911) p. 867. 



Thallus tenuis, laevigatus, glaucescens aut albidus, 

 hypothallo obscurato partim limitatus. Apothecia sat crebra 

 aut sparsa, verrucas formantia depresso-hemisphaericas, 

 0.4 — 0.7 mm latas, primum strato thallino tenuiter obductas, 

 dein mox aut demum denudatas nigricantesque. Perithecium 



