Pteridophyta - Pichi Sermolli, Rodolfo E. G; Turrill, W. B. (William Bertram), 1890-1961 (New York : Pergamon Press, 1959)
Reprinted from Vistas in Botany; pp. 421-493
Vistas in Botany. A volume in honour of the bicentenary of the Royal Botanic Gardens, Kew