176 E. A. Voinio, Pyrenocarpeae. 



cellulis vulgo anguloso-subglobosis, crass. O.016- — O.024 mm, bene 

 constricte concatenatis, saepe guttulas rubescentes continentibus, 

 membrana sat crassa. 



4. P. mammillosa (Th. Fr.) Vain. 



Segestria mammillosa Th. Fr. Lich. Arct. (1860) p. 262. Verrucaria 

 mamillosa Vain. Adj. Lich. Lapp. II (1883) p. 184. Sagedia declivum 

 Bagl. et Car. Comm. Crit. It. V (1864) p. 445; Jatta Fl. It. Crypt. Lich. 

 <1911) p. 888. 



Thallus tenuis aut sat tenuis, verruculoso-inaequalis 

 aut sat laevigatus, subdispersus, muscos destructos inae- 

 qualiter obducens, olivaceus aut griseo-nigricans aut ob- 

 scure cinerascens, opacus, hypothallo indistincto. Apothecia 

 crebra, verrucas formantia subglobosas aut subgloboso- 

 hemisphaericas, basi demum sat praeruptas aut leviter 

 constrictas, circ. 0.5 — 0.4 mm latas, amphithecio thallino, 

 thallo concolore, sat laevigato aut leviter inaequali late et 

 sat tenuiter obvelatas, vertice circ. O.2 — O.15 mm lato denu- 

 dato, nigro, subopaco, margine ostiolari haud aut leviter 

 prominente angustoque, ostiolo minutissimo, haud foveolato. 

 Perithecium globosum, parte superiore rubricoso-fuliginea, 

 parte inferiore dilutius colorata. Sporae fusiformes aut 

 oblongo-fusiformes, apicibus obtusis, typice 3-septatae, long. 

 0.015—0.030, crass. O.004 — O.0055 mm, loculis sat aequalibus, 

 membrana sat tenui, haud gelatinosa. Gonidia a Trente- 

 pohlia iolitho praedita. 



Var. subnigratula Vain. Verrucaria mamillosa var. subnigratula 

 Vain. Adj. Lich. Lapp. II (1883) p. 184. 



Thallus obscurus, olivaceo- vel griseo-nigricans. Peri- 

 thecium parte superiore rubricoso-fuliginea, parte inferiore 

 rubricoso-rufescente. Sporae 3-septatae. 



Distr. Supra muscos in latere rupis ad Veskoniemi 

 in regione coniferarum mixtarum Lapponiae Inarensis 

 (Vain.). 



Perithecium KHO non reagens. Sporae long. O.015 — O.024, 

 crass. O.004 — O.0045 mm. Gelatina hymenialis jodo non reagens. 



Var. subfurvescens Vain. Verrucaria mamillosa var. s"ubfurvescens 

 Vain. 1. c. p. 185. 



