54 



THE ARCHAEOPTERIS FLORA 



fCH. 



Hyenia, Nathorst^, 1915 (Fig. 25). Leafy shoots radiating in 

 tufts from a stem or rhizome, shoots coalescent at the base. 

 Shoots bearing leaves in whorls at nodes, which are either not 

 prominent or very indistinct. Leaves at least four, perhaps to 

 six in a whorl, successive whorls superposed. Leav^es small. 



Fig. 26. Pseudobornia ursina, Nath., from the Upper 

 Devpnian of Bear Island. (1) Leafy shoots (much reduced). 

 (2) Fertile shoots (greatly reduced). Both after Nathorst 

 (1902). 



10-15 mm. long, rarely 20 mm. long and 1 mm. broad, uni- 

 nerved, forked once or more rarely twice at apex. Fructification 

 unknown. 



Distribution. Middle Devonian, Western Norway. 



This type appears to be near to Sphenophyllum but perhaps 

 differs in the habit and in the fact that the nodal lines are not 

 evident. 



Pseudobornia, Nathorst^, 1894 (Fig. 26). Stems large, seg- 

 1 Nathorst (1915). 2 /ftj,;. (I894). 



