Acta Societatis pro Fauna et Flora Fennica, 49, N:o 7. 9 



at the angles always bidentate as figured by De Bary 

 pi. 5 f. 26 (and copied in Cooke, Brit. Desm. pi. 14 f. 3 c). 

 [N:o 825]. 



Hab. The zygospore figured is from Gov. of Archangel. - 

 PI. 5 f. 44. 



Genus Euastrum Ehrenb. 



Eu. insulare (W i 1 1 r.) Roy var. excavatum, nova var. 

 Semicellulae trilobae lobis basalibus non vel vix retusis, 

 lobo polari dilatato profundiusque latiusque excavato. Long. 

 17,5 lat. 13, isthm. 3,2//, [N:o 881]. 



This form is very near to the form figured in West, 

 Mngr II pi. 40 f. 12. It should also be compared with Eu. 

 tuddalense Strom, Frw. alg. Telemark pi. 3 f. 2—4. 



Hab. Amongst Utricularia, Gov. of Archangel. - - PI. 2 

 fig. 20—21. 



Eu. elegans (B r e b.) K ii t z. var. ornatum West, Mngr. 

 II pi. 38 f. 26. The Finnish form is in front view almost 

 identical with the English one, but in vertical view consider- 

 ably thicker with more rounded subtruncate ends. Long. 

 43,6, lat. 25,i, crass. 20,5, isthm. 6//. [N:o 993 a]. 



Hab. Near Borga (Domargard) (S). PI. 2 fig. 12—13. 



Eu. lapponicum Schmidle, Pite Lappm. pi. 2 f. 29 

 (Syn. = £u. binale f. Hirn, Desm. Finnl. pi. 1 f. 17). The 

 granules of the centre of the semicell vary in number from 

 6 (as by H l r n) or 4 (as by S c h m i d 1 e) to 3 or only 2. 

 Long. 38, lat. 29, crass. 19, isthm. 8//. [N:o 1234]. 



Hab. Gov. of Archangel. PI. 2 fig. 14—15. 



Eu. dubium Nag. var. pseudocambrense Gronbl., 

 Desm. Keur. p. 30 pi. 6 f. 32—33. Membrana scrobiculis 

 supra tumorem centralem binis ornata. Long. 34 — 36, lat. 

 25—26, crass. 16,5, isthm. 6—7,3 /<. [N:o 978]. 



Compare also E. subglaziovii Borge v. minor Bo rge, 

 Regnell exp. pi. 4 f. 26; E. binale f. lagoensis Nordst., 

 Desm. Brasil. pi. 2 f. 4; £ abruptum f. minor West, Desm. 



