V] 



DICHOPODIAL BRANCHING 



Fig. 82. A =le3L{ of Afafonia pectinata., R. Br., showing catadromic helicoid structure, much 

 reduced. ^ = leaf oi Dipteris conjugata (Kaulf.), Reinw. ; showing anadromic helicoid 

 structure, much reduced. C=leaf of Dictyophylhini exile, much reduced, showing ana- 

 dromic heHcoid structure (after Nathorst). Z' = leaf of Camptoptei-js spiralis, much reduced, 

 showing anadromic helicoid structure, spirally twisted (after Nathorst). .£' = leaf of Pteris 

 seinipinnata, reduced, showing anadromic helicoid structure of the pinnae only. j'^=leaf of 

 Odontopteris minor, Brongn., reduced, showing anadromic helicoid structure (after Zeiller). 



