xxx] 



NETJBOPTERIS 



111 



B. Neuropteris gigantea, etc. Potoniea, Zeiller. 



In 1899 Zeiller^ 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 



A & 



Tig. 421. A. Potoniea adiantiformis Zeill. (very slightly enlarged). 



B. Miorosporangia of Potoniea (enlarged). 



C. Linopteris obligua; side-Tiew of mlorosporophyU. 



D. Newopteria heterophylla, pinnules and miorosporangia (?). 



E. Linopteris obliqua, surface-view of miorosporophyll. 



(A, C, E, after P. Bertrand; B, after Carpentier; D, after Kidston.) 



and expressed the opinion that Potoniea may be the fructification 

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

 pentier^ afterwards described similar though rather larger examples 



' ZeiUer (99) B. p. 52, PI. iv. fig. 19. ^ Carpentier (11) p. 12, Pis xvi. xvn. 



