20 



transition to f. nana Kjellm. and f. hursigera J. Ag. and on the 

 other hand to {.linearis (Huds.) and f. membranacea K. Rosenv. 

 The shorter specinnens (1 — 4 cm.) with relatively thick frond 

 agree with f. hursigera (J. Ag.) Kjellm. which is again by inter- 

 mediate forms closely connected with f. nana Kjellm. Forma 

 linearis (Huds.) is scarce in this collection. Forma membranacea 

 K. Rosenv. is relatively amply represented. This thinner form 

 of F. itiflatus ought in my opinion rather to be reckoned a 

 form than a variety, as it has surely been produced by environ- 

 mental influences (Rosenv. Deux. Mém. 1. c). At Kap Dalton an 

 interesting form belonging to f. membranacea was gathered. It 

 consists of low plants with narrow and thin frond ; they are not 

 fastened to the bottom but densely entangled, a sort of Æga- 

 gropila form. Two samples belonging to this form have been 

 gathered, the greater one is 11 cm. long and 10 cm. broad 

 (Fig. 1). According to reports from C. Kruuse this form was 

 found forming «dense but loose» (o: not fastened to the bottom) 

 «and unbroken strata covering the bottom, in shallow water, in a 

 depth of 2 — 10 fathoms, in two lagoons near Kap Dalton, where 

 the sea was calm, the covering of ice of long duration, the 

 water salt, the bottom of basaltic gravel». 



The species was gathered with receptacles in June — August. 



f. typica. 



Gr. or.: Kap Dan, The estuary of Kalerajuek near Kap Dan, 

 Tasiusak, Tiningnekelak, Angmagsivik, Moræneo, Kangerdlugsuatsiak. 



f. bur siger a (J. Ag.). 



Gr. or. Ikerasak, Bræfjord, Nualik. 



f. membranacea K. Rosenv. 



Gr. or.: Kap Dalton, Turner Sund, Polhems Dal. 



Farn. Tilopteridaceæ. 



Scaphospora Kjellm. 

 39. S. arctica Kjellm., K. Rosenv. Deux. Mém. p. 48. 



