Acta Societatis pro Fauna et Flora Fennica, 53, N:o 1. 261 



Crouan (Nyl. Fl. 1862 p. 464) verruculis depressis thalli et apotheciis 

 livido-fuscescentibus ab his differt. B. albicans Arn. (Fl. 1872 p. 140), 

 a qua Zwackh Lich. Exs. n. 897 recedit, sit proxima B. violaceae 

 (Crouan), sed species autonoma. L. hemipolioides Nyl. (Fl, 1873 p. 294) 

 habitu B. Naegelii ab his omnibus distinguitur. 



20. B. atrolivida Vain. 



Lecidea atrolivida Vain. Adj. Lich. Lapp. II (1883) p. 10, 209. 



Thallus sat crassus aut modice incrassatus, verruculoso- 

 inaequalis, saepe areolato-diffractus aut subdispersus, parce 

 sorediosus. Apothecia mediocria, late adnata, disco sub- 

 livido-fuscescente vel livido-nigricante, primum plana mar- 

 ginataque, margine saepe pallidiore (testaceo-fuscescente), 

 sat tenui, demum convexa immarginataque. Hymenium 

 superius striatim fuscescens. Hypothecium pallidum aut 

 parte superiore sat dilute fuscescens. Perithecium extus 

 pallidum et in margine intus fuscescens. Sporae fusi- 

 formes, apicibus obtusis, 3-septatae, long. O.on — O.020, crass. 

 0.006 — 0.007 mm. 



Distr. Ad basim rupis chloritico-schistosae prope 

 Saarenmylly in par. Kianta in OKaj. (Vain.). 



Proxima est B. obscuratae, sed thallo parce soredioso ab 

 ea differens. Thallus etiam magis evolutus, apothecia latius 

 adnata et margo apotheciorum intus fuscescens, quae notae 

 autem in B. obscurata variant. — Apothecia lat. circ. O.7 — 1.3 

 mm, sat dispersa aut partim aggregata, opaca, nuda. Peri- 

 thecium 0.090 — 0.120 mm crassum, ex hyphis radiantibus, sat 

 modice pachydermaticis, conglutinatis formatum, cavitatibus 

 angustis, oblongis. Hypothecium irregulariter contextum, in 

 parte superiore sat modice pachydermaticum, cavitatibus sub- 

 rotundatis, in parte inferiore pallidum, pachydermaticum, cavi- 

 tatibus elongatis, tenuibus. Hymenium O.120 — O.iio mm crassum, 

 jodo persistenter caerulescens, ascis partim fuscescentibus aut 

 fulvescentibus. Epithecium et partes obscuratae apothecii KHO 

 distinctius violascunt. Paraphyses arete cohaerentes, simplices, 

 tubulis crass. O.ooi mm et apice O.0015 — O.002 mm clavatisque, 

 membrana gelatinosa tenui, in KHO parum turgescente. Gonidia 

 cystococcoidea, simplicia, subglobosa et diam. circ. O.012 — O.014 

 mm, sat pachydermatica, saepe etiam majora, diam. circ. O.020 — 

 0.018 mm, et autosporas, diam. O.006 — O.008 mm, irregulariter sub- 

 globosas continentia. 



