genus by figures, showing a portion of the fronds natural 
size and also magnified, in which the anatomical structure 
(venation) and the form and position of the sori and other 
parts of the fructification are distinctly shown, each plate 
being accompanied with descriptive letterpress. At the 
time of the author’s death, only forty plates of this — 
tical and useful work were published. 
With the works of Schott and Brown commenced a new 
era in the history of Pteridology. It is, however, to Pro- 
[fessor Presl, of Prague, that the credit is due of being the 
(his celebrated work entitled * Tentamen Pteridographes.” 
m Osmundew), which he classifies under 115 genera arranged 
ference in the direction of the ring that surrounds the 
. five genera and twenty-three species; the second eight 
ring of the sporangia is vertical. 
ment : :— 
ORDER I —FILICES. Presl. 
Sg 
work consists of quarto plates, each plate illustrating a ; 
first to publish a general systematic arrangement of |. 
genera founded on venation, which appeared in 1836 m 
In that work about 1,500 species of annulate Ferns are Së 
enumerated (exclusive of the tribes Hymenophyllee md... 
= genera and twenty-four species. The second sub-order is — . 
termed Oathetogyrate, and contains all Ferns in berech the i 
Sub-Ordor a Bernh. Ring horizontal b : 
ON GENERA AND SPECIES. so 
‘under two sub-orders, technically distinguished by the dif. —— 
sporangium. ‘The first he terms Helicogyrate, which is | d 
characterised by thé ring being horizontal or more or less ` 
- Oblique with its point of attachment, it contains two tribes, —— 
viz. :—Gleicheniacee and Cyatheacee, the first of which has 
The “scat pid is an 2r e Presl's arrange- bo 
