190 E. A. Vainio, Lecideales. 



18. B. tenella Kullh. 



Kullh. Not. Sallsk. p. F. et Fl. Fenn. Forh. XI (1871) p. 273- 

 Lecidea tenella Nyl. Fl. 1881 p. 185. Bacidia egenula Th. Fr. Lich. 

 Scand. II (1874) p. 363 p. p. (conf. infra). Lecidea egenula Nyl. 

 Fl. 1872 p. 355 p. p. (in Fl. 1865 p. 147 ad diversam speciem per- 

 tinet). 



Thallus tenuis aut crassus, irregulariter diffractus 

 dispersusve, inaequalis, verruculosus aut verruculoso- 

 granulosus, sordide vel glaucescenti-cinerascens. Apo- 

 thecia minutissima, tenuia, late adnata, plana aut raro 

 leviter convexa, nigra aut fusconigra, margine tenuissimo, 

 demum saepe inconspicuo. Hymenium tenue, superne 

 interrupte sordide violascens, KHO non reagens. Hypo- 

 thecium dilute lutescens, plectenparenchymaticum. Peri- 

 thecium plectenparenchymaticum, sordide violascens, KHO 

 non reagens. Sporae aciculares, longitudine mediocres, 

 gracillimae, septis inconspicuis. 



Distr. Ad lignum pineum in pariete vetusto in Riuska 

 prope Mustialam in Ta. (A. Kullhem), una cum Lecan. ceri- 

 nella Floerk. 



Affinis sit B. inundatae, at species autonoma. — Thallus 

 leprosus, opacus, hypothallo indistincto. Apothecia lat. 0.i5o — 

 0.220 mm, crass, circ. O.oeo mm, nuda, opaca, margine parum 

 conspicuo, disco concolore. Hymenium 0.03o— O.035 mm crassum,. 

 „jodo vinose rubens, praecedente fugacissima levissimaque cae- 

 rulescentia, KHO vel HNO3 vix mutatur" (secund. Th. Fr. 1. c). 

 Hypothecium KHO non reagens, membranis leviter incrassatis^ 

 cavitatibus cellularum 0. 0015— 0. 004 mm latis, rotundatis aut ellip- 

 soideis, in parte superiore subhorizontaliter, ceterum irregulariter 

 dispositis. Perithecium ex hyphis radiantibus, conglutinatis for- 

 matum, membranis leviter aut modice incrassatis, cavitatibus 

 cellularum rotundatis, O.0015 mm latis, HNO3 non reagens. Para- 

 physes arete cohaerentes, simplices, tubulis tenuissimis, membranis 

 gelatinosis. „Sporae vulgo rectae, apicibus acutis aut altero apice 

 obtuso, septis inconspicuis, long. O.024 — O.039, crass. O.ooi — O.0015. 

 mm" (secund. Kullh. et Nyl. in herb. suis). Gonidia pleurococ- 

 coidea, vulgo simplicia, diam. O.oos— O.012 mm, parce 2-cellulosa 

 et glomerulosa, 



Obs. Lecidea egenula Nyl., Fl. 1865 p. 147, Lich. Paris (1896) p. 

 85, Vain. Lich. Exp. Vegae Pitlek. (1909) p. 105, supra saxa arenaria 



