Ill] 



HOSTIMELLA AND APHYLLOPTERIS 



43 



Distribution. Lower Devonian, Norway (Roragen); Middle 

 Devonian, Bohemia. 



The examples of this oenus are still entirely obscure objects. 

 They appear to stand nearest to Psihrphyton. 



Fig. 28. Ilostimdla liostiinensis, P. & B. var. rliodene- 

 formia, P. & B., from the Middle Devonian of Bohemia. 

 (About half nat. size.) After Potonie and Bernard 

 (1904). 



Aphyllopteris. 



Aphyllo'pteris,- Nathorst, 1915 =-'i Pteridorackis, Nathorst, 

 1902. This gemis, as emended by Halle^, 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, ^Vestern Norway; LTpper Devonian, Bear Island and 



other countries. 



1 Halle (1916), p. 24. 



