Acta Societatis pro Fauna et Flora Fennica, 49, N:o 7. 15 



Eu. bidentatum Nag. f. biscrobiculata Ducell., Desm. 

 Suisse II page 127 f. 114. Our specimens agree quite well 

 with the figure mentioned but are more granulate. Long. 

 53, lat. 34, isthm. 11 \i. [N:o 994]. 



Hab. Domargard near Borga (S). — PI. 3 fig. 26. 



Eu. mononcylum (Nordst.) Racib. var. polonicum 

 Racib. f. fennica nova f. Margines lobi polaris spinulis 

 binis utrimque in angulis lateralibus armatae; margines 

 loborum lateralium granulis acutis 4 — 5; ceterum membrana 

 granulis obtusis ornata. Long. 57, lat. 49, crass, (max.) 28, 

 isthm. 15 fi. [N:o 973]. 



Hab. Messuby near Tammerfors (W); „Isthmus kare- 

 licus" (SE). — PI. 3 fig. 33—34. 



The Finnish form agrees very well with var. germani- 

 cum Schmidle (Hedwigia 1894 pi. 1 f. 17) according to 

 the outline of the cells and the general arrangement of the 

 granules. The var. polonicum Racib. (Nonn. Desm. Pol. 

 pi. 13 f. 6) is also very nearly related. Our form is dis- 

 tinguished from both these by the small spines at the angles 

 of the polar lobe and the 4 — 5 acutely conical granules at 

 the margins of the lateral lobes. In these respects it much 

 resembles the spinate Nordstedtian form (= „a capense 

 Rac"). Whether these four forms (viz. var. capense, v. po- 

 lonicum, v. polon. f. fennica, v. germanicum) really are dis- 

 tinguishable is not quite certain. 



The spinate forms of E. mononcylum very much resemble 

 some forms of E. spinulosum D e 1 p. Compare the following 

 forms of E. mononcylum: Borge, Sao Paolo pi. 5 f. 9; 

 Nordst., Alg. Mus. Lugd.-Bat. pi. 1 f. 13; with E. spinu- 

 losum: Borge, Regnell exp. pi. 5 f. 4; W i 1 1 e, Bidr. Syd- 

 Amer. pi. f. 27; Gut win ski, Nonn. alg. nov. pi. 7 f. 67; 

 Turner, E-Ind. pi. 10 f. 51; Raciborski, Nowe Desm. 

 pi. 6 f. 6—7. 



The most important distinctive features are: 



