2129 UNDERWOOD : REVIEW OF THE GENERA OF FERNS 
. 1825 
Hooker (Exotic Flora 2: 147) established the genus Parkeria 
based on P. pferidoides from Guiana, apparently in ignorance of the 
genus Ceratopteris established four years previously, and 77/eo- 
zoma in which Robert Brown had antedated him by two years. 
1825 
Reinwardt (Syll. Pl. Regensb.*) published : 
Onychium (2) based on O. carnosum. 
Dipteris (3) based on D. conjugata. 
Ophiopteris (3) based on O. verticillata. 
Tegularia (3) is proposed by Hornschuch as a substitute for 
Ceramium Reinw. based on T. adiantifolia (Aspidium truncatulum 
Swz., Willd.). 
oa (3) preoccupied (= 7: iaa Hornsch.). 
1826 
EPE (Freycinet s Voy.) published : 
. Alcicornium (307) based on A. vulgare. 
2. Monochlaena (340) based on M. sinuosa a needless synonym 
for Didymochlaena. “ Hippodium Gaud. MS.” is also published 
as an additional synonym. 
Adenophorus, Pinonia and Schizoloma are further characterized 
altho they were originally published two years earlier. 
; 182 
Eschweiler (Linnaea 2: 117) established the genus Potkilopteris 
on Acrostichum scandens Raddi, the form of which was changed to 
Poectlopteris later by Presl and others. 
| 1827 
Desvaux (Ann. Soc. Linn. Paris, 6:) published a long account 
of the known ferns t with many new species and the following new 
genera : 
* Often quoted as Syll. Ratisbon, and published in the Bot. Zeitung (Bor) is one as one 
of the early miscellaneous papers of that serial 
T We have recently received a copy of this paper in the original covers, which 
bears the title Prodrome de la famille des Fougères ; pp. 171-212 bear the date ** Ma 
1827” and pp. 213-337 bear the date ** Juillet 1827.” The text calls for plates 7-11 
but only 7 and 8 are present, as is also the case with the copy in the Kew Herbarium, 
the only other copy seen. 
