178 E. A. Vainio, Pyrenocarpeae. 



cosum, cavitatibus cellularibus confertis minutissimis (cellulis pariete 

 crassulo) excavatum" describens. Revera hyphae thalli variis plantis 

 fragmentisque plantarum alienarum immixtae crustam formant. 



5. P. lectissima (Fr.) Zahlbr. 



Ascolich. (Engl. el. Prantl. Nat. Pflanzenf. Lich. 217 Lief., 1903) 

 p. 66; A. Smith Mon. Brit. Lich. II (1911) p. 333. Segestrella lectissima 

 Fr. Lich. Eur. Ref. (1831) p. 430; Koerb. Parerg. Lich. 4 Lief. (1863> 

 p. 325. Verrucaria lectissima Nyl. Prodr. Lich. Gall. (1857) p. 433, Exp. 

 Pyrenoc. (1858) p. 37, Lich. Scand. (1861) p. 278, Fl. 1881 p. 453; Vain. 

 Fl. Tav. Or. (1878) p. 120; Hue Addend. II (1888) p. 293. Segestria 

 lectissima Arn. Lich. Tirol XXIII (1887) p. 90, XXX (1897) p. 38 (Fr. 

 Syst. Orb. Veg., 1825, p. 287). Verrucaria umbonata Wallr. Fl. Crypt. 

 Germ. (1831) p. 306 (sec. Arn.); Schaer. Spic. Lich. Helv. (1833) p. 337 

 (haud Ach.). Sagedia umbonata Jatta Fl. It. Crypt. Lich. p. 891. Se- 

 gestrella thelostoma Mass. Ric. Lich. Crost. (1852) p. 158 (sec. Jatta). 



Exs. Flot. Lich. Exs. (1829) n. 50 A (sec. Arn.). - - Schaer. Lich. 

 Helv. Exs. XII (1836) n. 285 (Arn.). — Zwackh Lich. Exs. (1850) n. 23 

 A, B, C, (1882) n. 734. — Leight. Lich. Exs. (1851) n. 32. — Hepp 

 Flecht. Eur. Ill (1860) n. 696. — Rabenh. Lich. Eur. Exs. XXII (1862) 

 n. 650. — Anzi Lich. Exs. Min. Rar. It. (1865) n. 394. Lojka Lich. 



Hung. (1H82) n. 161. Arn. Lich. Exs. (1883) n. 1066. — Havaas Lich. 

 Exs. Norv. (1903) n. 157. 



Thallus sat tenuis, laevigatus, continuus aut rimulosus, 

 pallido-cinerascens aut cinereo-glaucescens aut raro albido- 

 glaucescens, opacus, hypothallo indistincto. Apothecia sat 

 crebra, verrucas formantia conoideo-hemisphaericas aut 

 late conoideas, basin versus sensim dilatatas, 0.3 — 0.4 mm 

 latas, amphithecio thallino, thallo concolore obscurioreve, 

 laevigato, tenuiter late aut demum anguste obvelatas, ver- 

 tice demum plus minus late denudato, fuscescente aut 

 rufescente aut rarius nigricante pallidove, margine ostiolari 

 sensim conoideo-prominente aut raro minute mamillato, 

 ostiolo minuto, haud foveolato. Perithecium subglobosum, 

 pallidum aut vulgo vertice rubricoso-rufescens. Sporae 

 fusiformi-oblongae, apicibus obtusis, „long. 0-021— O.034 mm" 

 (Nyl.), „crass. O.otn— O.ooes mm" (Arn. et Nyl.), 3-septatae r 

 loculis sat aequalibus, membrana sat tenui, haud gelatinosa. 

 Gonidia a Trentepohlia umbrina praedita. 



