604 



Underwood: American ferns 



totnosing veins, formerly associated erroneously under the genus 



Gymnopt 



Gymnopteris of Synopsis Filiciim\ will 

 form a single genus, or be differentiated into 

 several, as held by Presl, John Smith and 

 Fee, may well form a later discussion. 

 Suffice it to say that the American species, 

 elaborately treated by Carl Christensen 

 under Leptochilas § Bolbitis* in our opinion 

 are not congeneric with Acrosticlium axil /are, 

 and as a coherent group must bear the 

 name Poikiloptcris f as the oldest name 

 applied to any species included within the 

 present generic limits. Their venation is 

 amply characterized in the illustrations 

 given in Mr. Christensen's admirable paper 

 and may be' seen in 



the 



accompanying 



figure (figure 16). We do not purpose a 

 duplication of Mr. Christensen's work, but 

 having seen nearly all the original speci- 

 mens cited in his paper, and in addition the 

 equally extensive collection at Kew which 

 materially supplements those cited, and 

 particularly the originals of Presl at Prague, 

 we wish to make a correction regarding the 

 status of one of the doubtful species cited at 

 the close of his paper. 



Mr. Christensen says (page 297): 



"Poccilopteris crenata Presl, Epim. bot. 174. 



1 849. — Rio. After a remark on a sheet in 



_ Herb. Berol. (by Mettenius ?) and after the 



Poecilopuris crenata description this is only a common form of 



Presl. Drawn from Presl* s 

 type material at Prague. 

 15, Sporophjllary pinna. 



serratifolins. ' 9 

 The above quotation notes the usual 



16, Normal steri 

 Both natural size: 



e pinna. European neglect to look up type specimens 



so easily accessible as those in Presl's herba- 

 rium, and also emphasizes the force of a statement that cannot be 



* Bot. Tidsskrift 26 : 283-300. 1904. 



f Eschweiler, Linnaea 2 : 1 17. 1827 ; afterwards (1836) called Poecilopteris by 

 Presl. 



