XXX] NEUROPTERIS 111 



B. Neuropteris gigantea, etc. Potoniea, Zeiller. 



In 1899 Zeiller 1 instituted the name Potoniea for some peculiar 

 fertile leaves found in the Coal Measures of Heraclea consisting 

 of a branched axis with cuneate segments, 7 10 x 6 8 mm., 

 bearing numerous fusiform bodies, 1 1-5 mm. long, at the upper 

 edge (fig. 421, A). These marginal bodies he regarded as sporangia 



D 



TIG. 421. 



Potoniea adiantiformis Zeill. (very slightly enlarged). 

 Microsporangia of Potoniea (enlarged). 

 Linopteris obliqua; side-view of microsporophyll. 

 Neuropteris heterophylla, pinnules and microsporangia (?). 

 Linopteris obliqua, surface-view of microsporophyll. 



and expressed the opinion that Potoniea may be the fructification 

 of some form of Neuropteris, Mariopteris or Alethopteris. Car- 

 pentier 2 afterwards described similar though rather larger examples 



1 Zeiller (99) B. p. 52, PI. iv. fig. 19. 2 Carpentier (11) p. 12, Pis xvi. xvn. 



