Acta Societatis pro Fauna et Flora Fennica, 53, N:o 1. 179 



maticis, sat crebre septatis, cavitatibus cellularum O.ooos mm latis aut 

 in margine O.002— O.0025 mm latis. Hypothecium superne impure aut 

 partim dilute pallescens, plectenparenchymaticum, cellulis in seriebus 

 irregularibus, cavitatibus rotundatis aut saepius depressis, O.0015 — O.002 

 mm latis, membranis sat tenuibus, inferne decoloratum, irregulariter 

 chondroideum, tubulis tenuibus, membranis incrassatis. Hymenium 

 0.085 — 0.120 mm crassum, jodo caerulescens, ascis dein vinose tinctis. 

 Epithecium in apotheciis obscurioribus partim tenuiter subviolascens, 

 partim pallidum aut subdecoloratum, partibus intensius coloratis KHO 

 distinctius violascentibus. Paraphyses laxe cohaerentes, crass. O.ooi — 

 0.0015 mm, simplices. Sporae (ex Nyl. in herb.) aciculares, rectiusculae, 

 apicibus acutis, pluri-septatae, long. O.oeo— O.oso, crass. O.004--O.003 mm. — 

 Thallo isidioso optime distinguitur a B. fuscorubella et *B. laurocerasi. 

 Ad corticem Quercus et Abietis prope Heidelberg (Zwackh v. Holz- 

 hausen) et Eichstatt (Arnold) in Germania et prope Ober-Uster (Ziirich) 

 in Helvetia (C. Hegetschweiler). 



15. B. arceutina (Ach.) Arn. 



Fl. 1871 p. 53; Th. Fr. Lich. Scand. II (1874) p. 352 (excl. v.); 

 Lindau Lich. Unters. I (1895) p. 23. Lecidea lateola 7. L. arceutina 

 Ach. Meth. Lich. (1803) p. 61, Lich. Univ. (1810) p. 197; Nyl. Prodr. 

 Nov. -Gran. Lich. ed. 2 (1864) p. 63. Secoliga arceutina Stizenb. Krit. 

 Lecid. Nadelf. Sp. (1863) p. 30 (excl. v.). B. arceutina a. genuina Branth 

 et Rostr. Lich. Dan. (1869) p. 107. Lecidea arceutina Nyl. in Norrl. 

 Bidr. Sydostr. Tav. Fl. (1870) p. 189 (excl. v.); Vain. Lich. Vib. (1878) 

 p. 64; Nyl. Lich. Paris (1896) p. 84. Lecidea effusa Hepp Syst. Samml. 

 (1852) n. 223 (baud Verrucaria effusa Hoffm. Deutschl. Fl. Cr., 1796, p. 

 174). Biatora effusa Hepp Flecht. Eur. (1853) n. 24. Lecidea luteola v. 

 fuscella Nyl. Herb. Lich. Paris. (1855) n. 135. L. luteola v. fuscescens 

 E. Nyl. Lafveg. Sav. (1857) p. 74. L. luteola v. endoleuca Nyl. Not. 

 Faun. Fl. Fenn. IV (1858) p. 98. 



Exs. Hepp Syst. Samml. XVII (1852) n. 223, Flecht. Eur. I (1853) n. 

 24. — Nyl. Herb. Lich. Paris. Ill (1855) p. 135.— Zwackh Lich. Exs. (1859) 

 n. 372 A, B. — Rabenh. Lich. Eur. XIX (1861) n. 523. — Anzi Lich. 

 Rar. Venet. (1863) n. 57. — Th. Fr. Lich. Exs. Scand. Ill (1865) n. 66. 

 — Arn. Lich. Exs. (1866) n. 326 a, (1876) b, Lich. Monac. (1893) n. 311. — 

 Malme Lich. Suec. Exs. II (1897) n. 32, XXVI (1917) n. 639. 



Thallus tenuis aut sat tenuis, leviter verruculoso- 

 inaequalis, cinereo-glaucescens aut rarius albidus. Apo- 

 thecia sat parva, fusca aut rarius nigricantia vel cinereo- 

 fuscescentia, baud pruinosa, late adnata, basi parum aut 

 leviter constricta, disco vulgo depresso-convexo, margine 



