29 o CONCUEREBL-AND SPECIES, 
J. E. Smith,* who, after the death of the younger Linnsus, ` 
became by purchase the owner of the Linnean Herbarium 
He published many botanical memoirs, and one on Ferns - 
in 1793, in the fifth volume of the “Memoirs of the | 
Academia of Turin," in which he characterised thirteen | 
[new genera—viz.: Darea, Scolopendrium, Wovdwardia, ; 
Lindsea (Dryander, MS.), Vittaria, Davallia, Dicksonia | 
(L’Heritier, 1788), Cyathea, Hymenophyllum, Schizæa, ` 
Gleichenia, Marattia, and Danca. These, with the Linnean 
genera, raised the number to twenty-four, which he divides 2 
under two sections—viz., Annulate and Ezannulate. The 
technical difference between these consists in the spore ` 
cases being furnished with a ring, or destitute of a ring. 
This mode of arrangement has since been adopted by all 
systematic writers on Ferns, as defining two distinct orders 
which will come under special notice hereafter, 
The next general systematic work was the “ Synopsis 
|Filicam” of Dr. Swartz, published in 1806. In that ox- 
. fcellent work nearly 700 Species are described, and ag 
| great many doubtful species enumerated. The de- — 
_ | seribed species are classified under thirty-six genera, being 
-fan increase of twenty-five since those of Linnæus. Eleven 
of them are founded on species removed from Linnean . 
genera, their separation being due to a special organ which _ 
1I have already described under the name of indusium, by 
| some called. involucrum., Although this organ was noticed 
. by Adanson and Necker, yet it was not employed by 
es  Linnsus in characterising his genera. It was first specially 
made use of by Sir J. E. Smith, in characterising his ne 
genera, and also about the same time by the German 
.  botanist Roth, and was adopted by Swartz in the abov 
hs named work, in which he arranges twenty-five of the 
.* Afterwards Sir James Edward Buith. i t 
