Ill] 



PSILOPHYTON 



21 



the removal of the smooth axes bearing fnictifications to a separate 

 genus could hardly be justified. Hailed himself describes a new 

 s^oecies {P. GoUhdnnidtii) in which the axes below were spinous, 

 though without visible macroscopic emergences in the higher 



Fig. G. Psilophyioii princeps, Dawson, from the 

 Lower Devonian of Roragen, Norway. Fer- 

 tile axes (the Daivsonites arcuatus of Halle) 

 without macroscopic emergences. After Halle 

 (1916). 



parts. We shall return to this point a little later when we shall 

 endeavour to show that in P. j^^'i'i^cejJS, the axes ahvays bear 

 emergences, though sometimes they are of microscopic size. We 

 may agree with Halle that the spiny shoots {P. ornatum of 

 Dawson) are not known in the fertile state. These shoots are 



1 Halle (1916), p. 21. 



