cxviii Appendix A. 
full consideration it appeared to me that, with the material in 
hand, the aid of the ‘ Species Filicum * completed only three 
years earlier, and of the Fern Herbarium in perfect order, and 
named according to his views, a competent botanist should find 
no great difficulty in carrying on this work to its completion. 
Such a botanist I knew my friend Mr. Baker to be, and also that 
he had made a study of Ferns, and accepted my father’s limitations 
of their genera and species. I therefore requested that gentleman 
to undertake the work, which to my great satisfaction he has done. 
The * Synopsis Filicum * contains seventy-five genera and about 
2,252 species, inclusive of Osmundaceae , Schizaeaceae,Marattiaceae , 
and Ophioglossaceae (fourteen genera and about 107 species), 
which are not included in the s Species Filicum.’ The total 
number of plates of Ferns published by my father is about 1,210, 
embracing 1,267 species; of which about 250 appeared under 
the joint authorship of Dr. Greville and himself. 
