XXVIl] 



GLOSSOPTERIS 



499 



Glossopteris Browniana, Brongniart^ Figs. 334 — 36. 



The specific name Browniana is now applied to obtusely 

 pointed leaves which sometimes reach a length of 15 cm., but 

 are usually rather shorter. In form and venation they closely 

 resemble the leaves of the recent genus Antrophyum and 

 species of Acrostichum. The comparatively broad midrib may 



Fig. 334. Glossopteris Browniana, Brongn. A. Nat. size : Bx,^. 



be replaced in its proximal portion by several parallel veins: 

 from it are given off numerous lateral veins which form a 

 reticulum characterised by meshes approximately equal in size 

 and elongated in a direction parallel to the general course of 

 the secondary veins (fig. 334). 



The drawings, originally published by Zeiller^, reproduced 

 in fig. 335 illustrate the venation and its range of variation ; 

 1 For synonymy, see Arber (05) p. 48. ^ Zeiller (96) A. 



