Karsten: SphcTropsideoe in Fennia observatse. 45 



XXXL Dothiorella Sacc. Syll. Ill, p. 235. 



Pyrenia emmpentia, in stromate basilar! botryose aggregata, 

 subsphseroidea, plus minus papillata, coriaceo-membranacea, atra, 

 glabra. Sporulse elongatae, continuee, hyalinge. 



1. D. Viscariae Karst. (Hedw. 1887, p. 127); Symb. ad Myc. 

 Fenn. XXIII, p. 10. 



Stromata gregaria, nonnumqvam subconfluentia, per epider- 

 midem laciniatim fissam erumpentia, planiuscula, forma varia, ut 

 plurimum rotundata, fusco-atra, usqve ad 1 mm. lata. Pyrenia 

 stromate basi innata, ovoidea, ssepe in papillam conoideam atte- 

 nuata, nigra, nitida, exigua. Sporulse fusoideo-elongatse, rectae, 

 longit. 12 — 15 mmm., crassit. circa 3 mmm. 



Hab. in foliis putrescentibus Viscarice vulgaris prope Mus- 

 tiala, m. Majo 1887 (Onni Karsten). 



2. D. sorbina Karst. (Hedw. 1884, p. 87); Symb. ad Myc. 

 Fenn. XV, p. 154. Sacc. Syll. Ill, p. 237. 



Pyrenia cortici innata, erumpentia, csespitosa, obovoidea vel 

 rotundata, ssepe inseqvalia, vertice subinde depressa, astoma, in- 

 terdum ostiolo papillato donata, aterrima, 0,3 mm. diam. Spo- 

 rulee fusoideo-elongatse, rectge, eguttulatae, hyalinae, longit. 3 — 5 

 mmm., crassit. 0,3 mmm. 



Hab. in cortice ramorum exsiccatorum Sorhi aiicuparice 

 prope Wasam. 



3. D. populicola Karst. (Hedw. 1884, p. 87). 



Syn. Plioma (BotryopJioma) populicola Karst. (Hedw. 1884, 

 p. 62). ^ Sacc. Syll. Ill, p. 97. 



Pyrenia per corticem erumpentia, ceespitosa, subovoidea, 

 astoma, tandem poro pertusa, atra, latit. 0,3 mm. Sporulae botu- 

 liformes, hyalinse, longit. 2—3 mmm., crassit. 0,5 mmm. 



Hab. in ramis emortuis Fopuli tremulm prope Aboam. 



Differt sporulis minoribus a D. populina Karst, statum sper- 

 mogonicum Otthice dimmiitce sistente. 



4. D. populina Karst. n. sp. 



Pyrenia peritheciis Otthice xjopidince Karst. commixta, erum- 

 pentia, sphseroidea, atra, exigua. Sporulse oblongatse, continuse, 

 longit. 5 — 6 mmm., crassit. 2 mmm. 



Hab. in ramulis exsiccatis Populi nigrce in horto Mustiaiensi. 



