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



45 



ornat. Schmidle 1. c. ; non X. antilop. v. ornat A n d e r s s. 1. c.) ] - 

 Holacanthum antilopaeum (Breb.l Migula, Krypt. Flor. (1906) pi. 26 

 D f. 3; M i g u 1 a, Die Desmid. ( 1911) pi. 6 f. 15. — Holaconth. antil. var. 

 fasciculoides Lutk.; Migula, Krypt. Flor. (1906) page 516; Dick, 

 Desm. Sudbayer. (1919) pi. 16. f. 3. — Holacanth. fasciculatum (Ehr.) 

 France; Migula, Krypt. Flor. (1906) pi. 27 D f. 5; Migula, Die 

 Desmid. (1911) pi. 6 f. 13. 



Nearest to the typical form must be placed as „f o r m a e" 



the following, which have not been recorded from Finland: 



X. antilop. I", depressa Turner, E.-Ind. (1893) pi. 12 f. 24; Pet- 



koff, Per. Spisan LVIII (1899) pi. 1 f. 25; - - f. B o r ge, Regnell exp. 



(1903) pi. 4. f. 4; — f. Borge, ibid. pi. 4 f. 5. 



Hab. In all parts of Finland; Gov. of Arch. PI. 4 



fig. 1-7. 



b) var. triquetrum Lund ell, Desm. Suec. (1871 1 pi. 5 f. l; 



Wolle, Desm. U. S. (1884) pi. 22 f. 1—3; E i c h 1 e r; Flor. Miedzyrzc. 

 (1893) pi. 10 f. 35; West, Monogr. IV (1912) pi. 109 f. 1 ; — var. fasci- 

 culoides f. triquetrum (Lund.) L ii t k e m., Attersee (1893) page 547. 

 To this variety belong the following forms: 

 var. triquetr. f. brasiliensis Nordst., Alg. Brasil. (1877) p. 26 fig. 

 xyl. 4. — var triquetr. f. minor K a c i b. Now. Desm. (1889) p. 107. — 

 (Not in Finland). - - A form with an accessory third spine at the apical 

 angles was seen. -- On the contrary the form described by E i c h 1. and 

 G u t w i n s k i as X. antil. v. triq. f. hexagona does not belong here 

 but perhaps to X. fasciculatum! 



Hab. Widely distributed in lakes. — PI. 4 fig. 8. 



c) var. polymazum Nordst., Norg. Desm. (1873) pi. l f. 20; 

 Wolle, Desm. U. S. (1884) pi. 23 f. 3—4; West, Mngr. IV (1912) pi. 

 108 f. 19 and pi. 109 f. 2. — Holacanthum antilopaeum v. laeve Schm, 

 Torka, Mg. Flor. Bromberg (1912) pag. 150 fig. D. 



To this variety belongs: 



var. polumaz. f. major Turn. E.-Ind. (1893) pi. 13 f. 1 (Not in 

 Finland). 



The accessory third spine at the basal angles was 

 sometimes as long as the other spines, sometimes smaller 

 or even totally absent. 



Hab. Widely distributed. 



d) var. dimazum Nordst., Norg. Desm. (1873) pi. l f. 19. 



Borge, Sverig. chlor. II (1895) pi. 1 f. 6. ■ - I antilop. var. ovale 

 Schmidle, Pite Lappm. (1898) pi. 3 f. 17. 



This variety includes a number of various forms. 



