24 ON GENERA AND SPECIES, 
being Bernhardi, Robert Brown, Bory, Desvaux, Kaulfuss, ` 
Gaudichaud, Raddi, Martius, Presl, Don, and others*. In ` 
these works a number of new genera are characterised, but — 
it is not necessary to enter into further details regarding 
them here, more especially as the principal of them are 
given hereafter, either as accepted genera or as synonyms. - 
These authors were followed by C. Sprengel, who, in the 
fourth volume of his “ Systema Vegetabilium,” published in — 
1827, brought together and arranged in systematic order ; 
the whole of the species of Ferns known to him. Although — 
this work cannot be looked upon otherwise than as a ` 
hasty compilation, and is of little value as a work of | 
reference, yet it has the merit of bringing into a brief 
compass a descriptive enumeration of all the Ferns known 
at that period, collated from previously published works; | 
the total number of his circinate Ferns being 1,309, which ` 
` Ihe arranges under fifty genera. This shows that a con- - 
 Siderable increase of species had taken 3 
. time of Willdenow, and a glance at the author's names - 
.. | Ferns of that and other of the Malayan Islands, in which 
. [460 species are described. Of these 300 were new, the 
_ whole being arranged under fifty genera, six of which were 
| previously unknown. i 
~ This was followed by the splendid folio work, Blume’s 
m “Flora of Java," which contains finely-coloured plates 
* See list of authors and books. — 
