Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 65 



Habitu V. latebrosae, sed apotheciis ab ea differens. — 

 Thallus inferne haud obscuratus, quare humidus parum mutatur. 

 Thallus in specimine orig. Achariano totus plectenparenchymati- 

 cus, ex hyphis verticalibus formatus, cavitatibus cellularum 

 O.0025 — 0.003 mm latis, membrana leviter aut modice incrassata 

 (tenui in specim. Fellmaniano, cavitatibus O.003 — O.004 mm latis), 

 strato corticali haud distincto, gonidia pleurococcoidea, globosa, 

 simplicia diam. O.007 — O.010 mm, p. p. 2-cellulosa, membrana 

 modice incrassata, conidia ellipsoidea aut rarius ovoidea, long. 

 O.002, crass. O.001 mm, sterigmata long. O.016, crass. O.0015 mm, 

 simplicia, parce articulata, apicibus conidia efferentibus. Peri- 

 thecium (in specim. Fellm.) lat. 0. 090 — 0. 150 mm, ostiolo O.030 mm 

 lato. Periphyses long. circ. O.016, crass. O.0015 — O.001 mm. Para- 

 physes in gelatinam diffluxae. Asci vulgo clavati, long. O.030- 

 O.035, crass. O.ou mm, membrana gelatinosa, modice incrassata. 

 Sporae 8:nae, distichae, simplices, decolores. 



26. V. subnigricans Nyl. 



Fl. 1881 p. 540. Verrucaria virens var. subnigricans Norrl. Fl. 

 Kar. Oneg. II (1876) p. 39, Symb. Fl. Ladog.-Kar. (1878) p. 32. 

 Verrucaria virens '■ : V. subnigricans Nyl. in Hue Addend. II (1888) 

 p. 277. 



Thallus crassus, areolatus, areolis circ. 1.5 — 0.5 mm 

 latis, contiguis, crebre verruculoso-inaequalibus, verrucis 

 depresso-convexis, fuscus aut fusco-nigricans, opacus, hypo- 

 thallo indistincto. Apothecia sat crebra, thallo immersa, 

 vertice perithecii denudato demum prominente et verrucam 

 formante O.25— O.2 mm latam, convexam, nigricantem fusce- 

 scentemve aut parte inferiore amphithecio thallino tenui 

 anguste obductam. Perithecium globosum, vertice late vio- 

 laceo-fuscescens, ceterum albidum, latere rotundato, margine 

 ostiolari haud prominente, ostiolo parvo. Sporae oblongae 

 (ellipsoideaeve), „long. O.015 — O.022, crass. O.006 — O.oos mm" 

 (sec. Nyl.). 



Distr. Ad saxa marmorea calcariaque in Ruskeala in 

 Karelia Ladogensi et in monte Valkeamaki in Karelia One- 

 gensi (J. P. Norrlin). 



Affinis est V. virenti Nyl., vix nisi colore thalli ab ea dif- 

 ferens. — Perithecium plectenparenchymaticum. Nucleus jodo 

 lutescens. Periphyses long. circ. O.026, crass. O.003 mm. Para- 

 physes in gelatinam diffluxae. 



