238 E. A. Vainio, Lecideales. 



B. violacea (Crouan) sec. specim. orig. n. 18716 in herb. 

 Nyl. apotheciis late adnatis, basi baud constrictis, baud elevatis, 

 immarginatis et tballo subalbido ab hac specie differt. B. ob- 

 scurata, cujus var. submuricola babitu apotheciorum B. rivulicolae 

 subsimilis est, parapbysibus gelatinosis et aliis notis internis ab 

 ea distinguitur. — Thallus sat tenuis, continuus aut diffractus 

 vel subdispersus, cinereo-glaucescens. Apothecia sat dispersa, lat. 

 0.3 — 0.4 mm, bene prominentia, parum nitida, margine discum 

 baud superante. Perithecium pallidum aut in summo margine 

 intusve rufescens, ex hypbis radiantibus, leviter pacbydermaticis, 

 conglutinatis formatum, cavitatibus oblongis, O.ooi mm latis. 

 Hypotbecium bypbis ad latera sat , verticaHbus, in medio sat 

 irregularibus, membranis modice incrassatis, cavitatibus brevibus, 

 circ. 0.002 (0.0015 — O.003) mm latis et partim parcius longioribus 

 tenuioribusque. Parapbyses sat laxe aut sat arete cobaerentes, 

 parte superiore septatae, baud gelatinosae, crass. O.ooi — O.0015 mm, 

 apice 0.003 — O.0035 mm clavataeque. Hymenium crass. O.oso — O.055 

 mm, jodo caerulescens, dein sat obscure vinose rubens (Vain. 1. c.) 

 aut persistenter caerulescens (in solutione, quam nunc adbibeo). 

 Epitbecium pallidum aut partim dilute rufescens, KHO distinctius 

 rubricosum. Asci long. circ. O.045, crass. O.ou — O.016 mm, Sporae 

 3-sticbae aut distichae. Gonidia cystococcoidea, globosa, diam. 

 0.008 — 0.016 mm, vacuolis lateralibus, membrana sat tenui, auto- 

 sporis numerosis, diam. O.004 — O.005 mm. 



7. B. epixanthoides (Nyl.) Kullh. 



Not. Siillsk. F. et Fl. Forh. XI (1871) p. 274; Th. Fr. Lich. 

 Scand. II (1874) p. 377. Lecidea Nyl. Fl. 1865 p. 5, Lich. Lapp. 

 Or. (1866) p. 183. L. sphaeroides f. epixanthoides Stizenb. Lee. Sab. 

 (1867) p. 16. 



Thallus totus aut partim farinoso-sorediosus. Apothecia 

 sat parva aut mediocria, vulgo late adnata, fere mox con- 

 vexa, primum (baud diu) sat tenuiter marginata, fusca aut 

 nigricantia aut umbrino-rufescentia testaceave. Hypotbecium 

 subpallidum vel subdecoloratum. Sporae oblongae, apici- 

 bus obtusis rotundatisve, 3-septatae, long. O.013 — O.022, crass. 

 0.004 — 0.005 mm. 



Distr. Ad corticem putridum vetustumve et m.uscos 

 destructos ad basim truncorum vetustorum putridorum Sali- 

 cis capreae, Populi tremulae, Sorbi, Tiliae, Alni, Betulae et 

 raro ad muscos putridos in latere rupis crescens, sat rara 



