52 E. A. Vainio, Pyrenocarpeae. 



subrectangularibus vel subcubicis, 0. 004— 0. 0035 mm latis. Peri- 

 physes bene evolutae numerosaeque, long. O.016 — O.026, raro — 

 0.040, crass. O.0015 — O.002 mm, saepe sat crebre septatae, simplices. 

 Paraphyses in gelatinam diffluxae, striis parcis indicatae. Asci 

 subclavati, membrana gelatinosa. Sporae parce nee bene evolutae, 

 8:nae, distichae, decolores, simplices, apicibus rotundatis, mem- 

 brana tenui. Thallus hyphis O.002 mm crassis, leptodermaticis, 

 ramosis, passim cellulas globosas, decolores, membrana modice 

 incrassata instructas, diam. O.016 — O.012 mm, formantibus, pars 

 epilithea dispersa tenuissimaque. Gonidia pleurococcoidea, glo- 

 bosa, diam. O.005 — O.ooe mm, demum glomerulosa. 



Ser. B. Perithecium lateribus angulato-productis. 



17. V. Helsingiensis Vain. (n. sp.). 



Thallus modice incrassatus aut sat crassus aut sat 

 tenuis, areolato-diffractus, areolis difformibus, 0.3— 1 mm 

 latis, contiguis aut dispersis, planiusculis, verruculoso- vel 

 subgranuloso-inaequalibus aut partim sat laevigatis, aut 

 partim subcontinuus, subolivaceo-nigricans, opacus, hypo- 

 thallo indistincto. Apothecia dispersa aut sat crebra, thallo 

 semiimmersa, verrucas formantia irregulariter subhemi- 

 sphaericas, O.35 — O.25 mm latas, parte inferiore amphithecio 

 thallino anguste obductas, vertice plus minusve late denu- 

 dato nigroque. Perithecium elevato-sublenticulare aut 

 depresse subglobosum, fusconigrum, integrum, lateribus 

 anguloso-productis, margine ostiolari haud aut leviter pro- 

 minente, ostiolo parvo, haud foveolato. Sporae ellipsoideae 

 oblongaeve, long. O.015 — O.019, crass. O.007 — O.010. 



Distr. Ad caementum muri in Alppila ad Helsing- 

 forsiam a. 1884 legi (una cum Endoc. moenium Vain.). 



Facie externa V. sparsiusculae Nyl. consimilis, sed peri- 

 thecio integro ab ea differens. Intermedia est inter V. viridulam 

 (Schrad.) et V. nigrescentem Leight., quibus proxime est affinis. 

 Gonidia pleurococcoidea, globosa, simplicia O.oos — O.010 mm, 

 saepe etiam glomerulosa, membrana sat tenui. Paraphyses in 

 gelatinam diffluxae, striis indicatae. Asci ventricosi aut clavati, 

 membrana gelatinosa. Sporae 8:nae, distichae, decolores, simpli- 

 ces. Nucleus jodo dilute glauco-caerulescens, dein dilute sordide 

 violascens. 





