Acta Societatis pro Fauna et Flora Fennica, 53, N:o 1. 195 



Bocidia orceutina f. hemipolia Th. Fr. Lich. Scand. II (1874) p. 353. 

 L. arceutina *hemipolia Nyl. Fl. 1873 p. 294; Norrl. Fl. Kar. Oneg. 

 II (1876) p. 31. L. hemipolia Nyl. Lich. Paris (1896) p. 84 (conf. 

 p. 196). 



Thallus tenuis aut tenuissimus, leviter verruculoso- 

 inaequalis aut sat laevigatus, albidus. Apothecia parva, 

 sessilia, basi bene constricta, mox bene convexa, semi- 

 globosa aut depresso-subglobosa, disco subdimidiatim vel 

 majore minoreve parte fuscescente nigricanteve, ceterum 

 pallido testaceove, raro toto nigro pallidove, immarginata. 

 Hymenium sat tenue, epithecio vulgo partim aeruginoso et 

 partim decolorato, KHO non reagente. Hypothecium de- 

 coloratum aut pallidum. Sporae aciculares, sat longae, 

 rectae, septis paucis, gracillimae. 



Distr. Ad corticem Alni, Ulmi et Populi rara. Ta.: 

 Manskivi (J. P. Norrlin) et Messila (Vain.) in HoUola, Mus- 

 tiala (A. KuUhem) in Tammela. KOn.: Perttiniemi (Norrl.). 



Hypothallus indistinctus. Apothecia crebra, lat. 0.4—0.? 

 ( — O.e) mm, crass, circ. 0.36o — 0.3oo mm, interdum livida aut 

 nonnulla tota pallida, ad truncos erectos crescentia partibus 

 acumen arboris spectantibus vulgo obscuratis. Hypothecium 

 superne albidum aut pallidum, KHO leviter lutescens aut ful- 

 vescens, subplectenparenchymaticum, cellulis irregulariter disposi- 

 sitis, cavitatibus rotundatis, O.0015— O.002 mm latis, membranis 

 modice incrassatis, inferne decoloratum, pachydermaticum, cavi- 

 tatibus mixtim rotundatis, ellipsoideis et oblongis, O.0015— O.003 

 mm latis, subchondroideum. Perithecium tantum infra apothecia 

 evolutum, tenue, chondroideum, ex hyphis radiantibus, congluti- 

 natis formatum, cavitatibus tenuissimis, oblongis, membranis 

 modice incrassatis, extus pallescens. Hymenium O.045— O.oso mm 

 crassum, jodo leviter caerulescens, dein vinose rubens. Para- 

 physes arete cohaerentes, simplices, septatae, tubulis O.ooos— O.oor 

 mm crassis, apice leviter incrassatae, saepe O.oois mm, raro 

 0.003 mm crass., apicem versus partim sordide rufescentes aut in 

 eodem apothecio aeruginosae, partim decoloratae, KHO non rea- 

 gentes aut colore dilutescente aut distinctius aeruginoso. Sporae 

 aciculares, rectae aut leviter contortae, alterum apicem versus 

 sensim attenuatae, pauci-septatae aut simplices, long. O.024— O.031 

 (in specim. orig.), crass. O.ooi— O.oois mm. Pycnidia verrucas 

 formantia hemisphaericas, 0. 110— O.oso mm latas, aeruginoso- 

 nigricantes (in lamina tenui). Stylosporae ellipsoideae, apicibus 



