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



75 



is the same form as figured by West (Mngr. IV pi. 108 f. 

 18). All figs. X 53 ° , 

 Fig. 8 — — var triquetrum Lund. X 530 /i 



9 — 14 — var. dimazum Nordst. Fig. 9 with unpaired 



apical spines; 10 — 11 with all spines paired; 12 one semi- 

 cell monstrous without apical spines; 13 and 14 more 

 different forms. Fig 14 X circ. 530 / 1( all others X ™l x 

 „ 15 — 16 — — var. minneapoliense Wolle X 530 / 1 



17 — 18 — — var. basiornatum Eichl. & Racib.; 17 X circ. 



350 



19 



21- 



23- 



25- 



28- 



30- 



350 



18 



circ. 



300/ 



/i 



20 

 22 

 24 

 27 

 -29 

 -31 



var. laeve Schm. f. incrassata, nova f. X 



530 



530 



I 



32 

 34 



33 

 35 



— — var. oligacanthum Schm. X 



— — var. hebridarum West X 530 j l 



X. fasciculatum var. longispinum, nova var. X 



X. antilop. var crameri nov. nom. X 530 /i 



— - — var. ornatum Anderss., 30 X 530 / 1 ; 31 X circ. 



530 



X. pseudobengalicum, nova spec. X 



X. tetracentrotum f. protuberans West X 530 ' 1 



36 X. cristatum var. uncinatum Breb., forma. X &30 l l 



37 X. cristatum f. polonica Gutw. A form with small ac- 

 cessory spines. X h30 /\ 



38 X. fasciculatum var. oronense West. X 530 / 1 



Fig. 1 — 2 

 3—4 

 5—6 

 7—8 

 9—10 

 11 — 12 

 13—15 



Plate V. 



Staurastrum tristichum Elfv. X 1460 / 1 

 5. forficulatum var. subheteroplophorum Gronbl. X 

 — var. subheteropl. f. simplex, nova f. X 



530 



i 



/i 



530 



- — var. heteracanthum Gronbl. X 



— — „ „ Forma ad var. verrucosum X 53 ° t 

 5. cornutum Arch. X 530 / 1 



S. geminatum var. heteracanthum nova var. X 



530 



530 



16 Zygospore of S. scabrum Breb. , 

 17- 20 S. polymorphum Breb. From Wittr. & Nordst. exsicc. 

 n:o 71. X 890 ;\ 

 21 — 23 5. cedercreutzii, nova spec. X 146t) 



