THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Vol. SIII. (If.S.), Uo. 1. MARCH, 1911. 



A SEED-BEARING IRISH PTERIDOSPERM, 



CR0S80TRECA HONINGHAUSI, Kidston 

 {LYGINODENDRON OLBHAMIUM, Williamson). 



BY 



T. JOHNSON, D.Sc, F.L.S., 



PROFESSOR OF BOTANY IN THE EOYAL COLLEGE OF SCIENCE FOR IRELAND. 



(PLATES l.-lll.) 



[/4 uthors alone are responsible for all opinions expressed in their Communicaiions.] 



DUBLIN : 



PUBLISHED BY THE EOYAL DUBLIN SOCIETY 

 LEINSTER HOUSE, BUBLIK. 

 WILLIAMS AND NORGATE, 

 14, HENIUETTA STEEET, COVENT GARDEN, LONDON, W^\;^\SOnisn irt^til. 



1911. 



Price One Shilling. X^^'Offal iViijSevi*^^' 



