250 E. A. Vainio, Lecideales. 



Distr. Ad corticem (praesertimque ramorum desicca- 

 torum Pini sylvestris), etiam Populi, Betulae, Alni, Quercus, 

 Sorbi collecta est. Ad corticem rami desiccati Sorbi prope 

 Selkapajanlahti Hoglandiae (M. Brenner, „L. interspersula f. 

 thallo olivaceo-nigrescente"). 



Apothecia crebra aut sat crebra, lat. O.2 — O.3 mm, saepe 

 subnitida. Hypothecium hyphis subverticalibus, modice pachyder- 

 maticis, cellulis minutis. Hymenium O.oso — O.060 mm crassum, 

 jodo persistenter caerulescens (dein sordide vinose rubens viola- 

 scensve sec. Th. Fr.). Epithecium in apotheciis rufescentibus 

 rubricoso-rufescens. Perithecium rubricosum aut decoloratum aut 

 in apotheciis nigris interdum aeruginosum, hyphis sat pachyder- 

 maticis, tubulis tenuibus. Paraphyses arete cohaerentes, parce 

 ramosae et ramoso-connexae, gelatinam sat abundantem, in KHO 

 turgescentem, percurrentes, O.ooi ( — O.oois) mm crassae (in specim. 

 Fennico tantum simplices vidi). Asci late clavati, long. O.oso — O.040, 

 crass. 0.015 — O.020 mm, polystichi. Sporae rectae aut leviter cur- 

 vatae, altero apice vulgo obtuso rotundatove, altero sat attenuato, 

 sec. Stizenb. „raro 1 1-septatae". Gonidia irregulariter subglo- 

 bosa, diam. O.oio — O.oie mm, saepe glomerulosa, flavescentia, 

 vacuolis lateralibus, membranis crassis, interdum etiam sat te- 

 nuibus. 



Obs. „L. interspersula f. thallo olivaceo-nigrescente tenui deter- 

 minato", a Nyl. indicata in -Brenner Bidr. Hogl. Lafv. p. 95, thallo 

 hyphis alienis, olivaceo-nigricantibus, crebre septatis, capnodioideis 

 obducto et gonidia continente pachydermatica, glomerulosa, flavescen- 

 tia, cellulis diam. O.oio — O.014 mm, epithecio tenui, dilute violascente, et 

 simul hymenio ceteruin majore parte aeruginoso, sporis O.024 — O.034 mm 

 longis et O.003 mm crassis instructa, est forma intermedia inter B. chloro- 

 coccam et *J3. interspersulam et nominetur f. nigrescens Vain., quae 

 hymenio magis aeruginoso et thallo esorediato (saltern in specimine 

 parvo hucusque lecto) a B. chlorococco differt. 



14. *B. interspersula (Nyl.) Vain. 



Lecidea interspersula Nyl. in Brenner Bidr. Hogl. Lafv. (Meddel. 

 Soc. F. et Fl. Fenn. XII, 1885) p. 94 p. p. (excl. „f. thallo olivaceo- 

 nigrescente"). 



Thallus evanescens, macula albida indicatus, laevigatas, 

 sorediis destitutus. Apothecia minuta, late adnata, depresso- 

 hemisphaerica, immarginata, nigricantia, nuda. Epithecium 

 intense aeruginosum (aut in eodem apothecio partim stra- 



