Acta Societatis pro Fauna et Flora Fennica, 49, N:o 2. 189 



rhaphis lucida Koerb. Lich. Sel. Germ. IX (1864) n. 262, Par. Lich. 4 

 Lief. (1863) p. 384 (Verrucaria lucida Nyl. in Vain. Fl. Tav. Or., 1878, 

 p. 121). 



2. C. atomaria (Ach.) Vain. 



Lichen atomarius Ach. Lich. Suec. Prodr. (1798) p. 16 (etiam 

 Verrucaria atomaria Ach. 1. c). Verrucaria oxyspora *V. populicola Nyl. 

 in Norrl. Ber. Torn. Lappm. (1873) p. 344. Verrucaria populicola Vain. 

 Adj. Lich. Lapp. II (1883) p. 188. Leptorhaphis tremulae Koerb. Syst. 

 Lich. Germ. (1855) p. 372 (V. stigmatella y. V. tremulae Ach. Meth. 

 Lich., 1803, p. 117, secundum specim. orig. e Suecia ad conidangia 

 Lecideae glomerulosae spectat); Arn. Lich. Frank. Jur. (Fl. 1885) p. 275, 

 Lich. Munch. (1891) p. 122; Jatta Fl. It. Crypt. Ill (1911) p. 495. Campy- 

 lacia tremulae Mass. Lich. It. Exs. X (1856) n. 352. Pyrenula tremulae 

 Hepp Flecht. Eur. Ill (1860) n. 706. 



Exs. Koerb. Lich. Sel. Germ. (1856) p. 119. — Rabenh. Lich. 

 Eur. Exs. VI (1857) n. 147. — Hepp Flecht. Eur. Ill (1860) n. 706. - 

 Arn. Lich. Exs. (1878) n. 774. — Nyl. et Norrl. Herb. Lich. Fenn. cont. 

 (1921) n. 802, 803. 



Thallus indistinctus. Apothecia crebra, verrucas for- 

 mantia subhemisphaericas, circ. O.iso — O.220 mm latas, atras, 

 sat opacas, lateribus praeruptis. Perithecium subgloboso- 

 hemisphaericum, lateribus rotundatis, fuligineum, dimidiatum, 

 basi extrorsum in maculam nigricantem haud dilatatum, 

 margine ostiolari haud prominente, ostiolo circ. O.040 mm 

 lato. Paraphyses parce evolutae, simplices. Asci subclavati, 

 membrana modice incrassata. Sporae 8:nae, aciculari-fusi- 

 formes, leviter arcuatae aut rarius rectae, apicibus obtusis, 

 long. O.016 — O.030, crass. O.003 — O.004 mm, 1 — 3-septatae, deco- 

 lores. 



Distr. Ad corticem Populi crescens, haud rara in maxima 

 parte Fenniae et Kareliae Vienaensis, passim etiam in Karelia 

 bor. et regione infralapponica Ostrobotniae. Ostrobotnia 

 bor.: Alkkula (Edvin Nylander). Lapponia Enontekiensis: 

 Vaha-Niva (J. P. Norrlin). Lapponia Inarensis: Ruoptuin- 

 vaara in reg. pinifera (Vain.), Kongas in reg. betulina prope 

 Mare glaciale (Vain.). 



Nucleus albidus, haud resinoso-guttulosus, jodo non reagens. 

 Paraphyses long. circ. O.040, crass. O.0015 — O.001 mm. Asci long. 



