in] 



HOSTIMELLA AND APHYLLOPTERIS 



43 



Distribution. Lower Devonian, Norway (Roragen); Middle 

 Devonian, Bohernia. 



The examples of this genus are still entirely obscure objects. 

 They appear to stand nearest to Psilophyton. 



Fig. 23. Ilnstimella hostimensis , P. & B. var. rhodeae- 

 formis ,P.&B.,fronitheMiddleDevonianofBohemia. 

 (About half nat. size.) .4fter Potoni6 and Bernard 

 (1904). 



Aphyllopteris. 



Aphyllopteris, Nathorst, 1915 = ? Pteridorachis, Nathorst, 

 1902. This genus, as emended by Hailed, consists of stout rachis- 

 like branch systems, without emergences, leaves or fructifica- 

 tions, and not dichotomously branched. As used originally bj- 

 Nathorst, it included more slender dichotomously branched types 

 such as Hostimella. 



Distribution. Lower Devonian, Norway (Roragen); Middle 



Devonian, AVestern Norway; Upper Devonian, Bear Island and 



other countries. 



1 Halle (1916), p. 24. 



