44 R. Gronblad, New Desmids. 



The characteristic vertical view at once distinguishes 

 this species from all known Cosmaria. 



fiab. Enontekis Lappmark (NW), leg. M. Kotilainen. 

 PI. 7 fig. 67—68. 



Genus Xanthidium Ehr. 



X. antilopaeum (Breb.) Kiitz. This species is the one 

 of the polymorph Desmids that includes the greatest number 

 of various forms. These have been arranged into several 

 groups called varieties, but have often been confused with 

 each other or even with some other species. Therefore I 

 have brought together the following review including all 

 forms recorded from Finland and a supplementary list of 

 all other forms. 



a) The typical form: X. fasciculat. var. polygonum E h r., 

 Infus. ( 1838) pi. 10 f. 24 a. -- Heterocarpella antilopaea B r e b. in Cheval. 

 Des. Micr. (1839) p. 272 [non ipse vidi!]. — X. fasciculatum a R a 1 f s in 

 Ann. Mag. Nat. Hist. XIV (1845) pi. 12 f. 3 a— d; Ralfs Brit. Desm. 

 ( 1848) pi. 20 f . 1 b [non a etc!]; Delponte, Desm. subaip. ( 1877) pi. 13 

 f. 20-23 [non f. 24—26! = X. hastiferum]; Turner, Alg. Strensall (1883) 

 f. 12; Wo lie, Desm. U. S. (1884) pi. 22 f. 4—5; Hauptfleisch, 

 Zellmembr. 1 1888) pi. 2 f. 73; (?) F. B. Carte r, Desmids (1889) fig. 14; 

 (?) Saunders, Flora Nebraska (1894) pi. 6 f. 13—14; X. polygonum 

 Hassall, Brit. Frw. alg. (1845) pi. 89 f. 4. - X. antilopaeum (Breb.) 

 Kiitz ing, Spec. alg. (1849) p. 177; Cooke.in Quekett M. J. VI (1881) 

 pi. 13 f. B ; W i 1 1 r o c k et Nordst. exsicc. n:o 577 (1883); Wo 1 1 e, 

 Desm. U. S. (1884) pi. 23 f. 1—2; Cooke, Brit. Desm. (1887) pi. 46 f. 2; 

 West, New interest, frw. alg. (1898) pi. 4 f. 42; Comere, Desm. France 

 (1901) pi. 15 f. 14; Saunders, Transact. Wash. Acad. Ill (1901) pi. 43 

 f. 38; H i r n, Desm. Finl. (1903) pi. 2 f. 33; West, Brit. Frw. alg. (1904) 

 page 169 f. xyl. 63 B.; West, Monogr. IV (1912) pi. 108 f. 7—9, 18. - 

 X. fasciculatum var. Iiexagona W o 1 1 e, Desm. U. S. (1884) pi. 23 f. 5—6. — 

 X. antilopaeum var. hirsutum Gay, Monogr. loc. (1884) p. 77. — X. spinu- 

 losum B e nnet t, Frw. alg. Engl, lake-distr. (1SS6) pi. 2 f. 17; Cooke, 

 Brit. Desm. ( 1S86) pi. 46 f. 4. - ? A', fasciculatum v. ornatum S ch m i d 1 e, 

 Beitr. Schwartzw, (1893) pi. 4. f. 6J. - - X. antilopaeum var. fasciculoides 

 Lutkem., Desm. Attersees (1893) [= X. fasciculatum Ralfs 1848 fig. 

 1 b; = X. antilop. in Wit tr. & N d t. exs. n:o 574]. — [? X. antilop. var. 

 ^thmidlei Borge, in Nuov. Notar. VI (1895) page 25. (= X. fascicul. v. 



