The Anatomy of Ceratopteris 
thalictroides, (L.) 
BY 
SIBILLE O. FORD, 
Bathurst Student , Newnham College , Cambridge . 
With Plate VI, and eight Figures in the Text, 
CERATOPTERIS thalictroides has been known in the 
past by several other names. The name Ceratopteris 
itself, however, has according to Hooker 1 priority over the 
rest, having been given to the plant by Brongniart 2 in 1821. 
Before this date it had been termed Pteris thalictroides' by 
Linnaeus 3 , and amongst other names Hooker mentions the 
following: Teleozoma by Brown in 1823, Pteris cornuta by 
Beauvois in 1825, and Ellobocarpus oleraceus by Kaulfuss 
in 1824. 
The Parkeriaceae are generally regarded as a sub-order of 
the Polypodiaceae, though some botanists raise them to the 
rank of a distinct order. The Parkeriaceae contain the single 
genus Ceratopteris , though at one time a second genus, 
Parkeria , was included in it, and in Hooker’s 4 ‘ Genera Filicum 7 
published in 1842, two separate coloured plates are found 
representing two almost similar Ferns, viz. Ceratopteris thalic - 
1 Hooker, W. J., 1858, p. 234. 3 Brongniart, 1821, p. 184. 
3 Linnaeus, 1757, p. 1527. 4 Hooker, 1888, pp. 12 and 50. 
[Annals of Botany, Vol. XVI. No. LXI. March, 1902.] 
