Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 195 



ventricoso-oblongi, membrana modice incrassata. Sporae 

 polystichae, subovoideo- aut fusiformi-oblongae, 3-septatae, 

 long. 0.oi7 — 0.oi9, crass. O.004 — O.005 mm, membrana tenui. 

 Var. elliptica (Ach.) Vain. 



Perithecium basi subelliptica. 



Ad corticem Pruni cerasi in Scandinavia crescens, in Fennia 

 nondum est lecta. — Perithecium subcaerulescenti-fusconigrum, 

 hyphis fuscescentibus e basi excrescentibus numerosis, flexuosis, 

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

 reagens, metaplasmate ascorum subrubescente. Asci long. circ. 

 0.065, crass. O.oie — O.020 mm. Paraphyses ascorum longitudine aut 

 eos leviter excedentes, crass. O.0015 mm, simplices aut parce fur- 

 catae aut parcissime ramoso-connexae, haud constrictae, cellulis 

 oblongis. Sporae 8:nae, tristichae, apicibus obtusis aut rotunda- 

 tis, loculis vulgo aeque longis, membrana haud gelatinosa, secun- 

 dum annot. Nyl. in herb, suo et. Arn. Lich. Munch, p. 120 „long. 

 O.010 — O.023, crass. O.003 — O.007 mm". Conidia „filiformia, recta, 

 long. O.009 — O.016, crass. O.0005 mm" (Nyl. in herb, suo), sec. Arn. 

 Lich. Fragm. XXII p. 15 Jong. O.015, crass. O.001 mm". 



Var. populi (Nyl.) Vain. Verrucaria cerasi f. populi Nyl. in Norrl. 

 Herb. Lich. Fenn. VIII (1882) n. 393. 



Perithecium basi rotundatum. 



Distr. Supra ramos Populi in Evo in Tavastia austr. 

 (J. P. Norrlin). Ad corticem arboris in Alandia (Edvin 

 Nylander). 



Forsan non est autonoma species. Thallus macula cine- 

 rascente indicatus. Apothecia sparsa. Perithecium in basi hyphis 

 excrescentibus fuscescentibus instructus, ostiolo demum dilatato, 

 foveolato. Sporae ex annot. Nyl. in herb, suo ovoideo-oblongae, 

 apicibus sat rotundatis, 3-septatae, loculis aeque longis, long. 

 O.022, crass. O.007 mm et conidia filiformia, recta, long. O.011 — O.016 mm. 



4. M. subcerasi Vain. 



Verrucaria subcerasi Vain. Adj. Lich. Lapp. II (1883) p. 189. 



Thallus parum distinctus, hypothallus indistinctus. Apo- 

 thecia sat crebra, verrucas formantia subhemisphaericas, 

 circ. 0.3 — O.2 mm latas, fusco-nigricantes nigricantesve, denu- 

 datas aut diu substrato tenuissime obvelatas, vulgo nitidas. 

 Perithecium subfuscescens, dimidiatum, margine ostiolari 

 haud prominente, ostiolo inconspicuo. Paraphyses parcissi- 



