120 



L. KoLDERUP Rosen VINGE. 



the upper end narrower. Most of the specimens were dried, but 

 some fragments are preserved in alcohol; one of these, which was 

 fructifying, had a thickness of 130—140/^, another sterile was 77 — 

 95 f2 thick. 



The outer cells are as a rule somewhat smaller than the inner, 

 and the structure thus most resembles that of the ^enus Punçtaria 



Fig. 7. Pnnctaria glacialis. A, part of frond seen from the surface; the shaded 

 cells are sporangia. 200 : 1. В — E, transverse sections of fronds with unilocular 



sporangia. 340 : 1. 



in the sense of J. Agardh (1896, p. 4). The frond is usually 4 to 5 

 cells thick. The cells contain numerous small disc-shaped chroma- 

 tophores. 



Some plants contain rather numerous sporangia which are all 

 unilocular. Seen from the face they have nearly the same form 

 and size as the vegetative cells, or they are a little more rounded. 

 In transverse sections of the frond they appear often enlarged in- 



