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rows. Again concerting with Harvey's illustrations (Harvey's 

 Ner. Austr. tab. XXVII.) and Prof. J. Agardh's description (J. 

 Ag. Sp, Alg. II. p. 1 184) of Dasya pectinata (i.e. Pteronia pectinatd), 

 we Understand that pinnae (i. e. " Langs わ ross ") arise from every 

 second node and pinnulae (i.e.. " Haarbldttern ") from every 

 articulation, ― both alternately and distichously. Thus the arrange- 

 ment of " Kurztriebe " and " Haarblattern " is wholy different 

 from that of those of the present plant which has all " Langtriebe " 

 always transformed from upper one of the paired " Haarbldttern " 

 and strictly keeps this regularity for the general arrangement of 

 il Haarbldtlern and ' k Langtriebe!' Again, "Haarblaltern" which 

 are pectinated along the upper side of the rachis alternate alonp- 

 both sides of branches in so regular manner that those —arising 

 from two consecutive nodes stand in alternation on the sides. 

 Plant having such a regular disposition of " Haarblattern and 

 " Lanptriebe does not find its position among estaolished genera. 



In the next place, Pteronia pectinata is said to have com- 

 pressed or flattened frond according to Prof. Falkenberg's 

 description (though it appears cylindrical from Harvey's illustration), 

 which has branches and " Haarbldttern " disposed in distichous 

 and alternate manner. Moreover, some (" haufig 2 aureinander 

 folgende ") " Haarbldttern " produce branches from their basal 

 cells pointing upwards. This seems to me to show some relation 

 with the pectinate branching of " Haarbldttern " in our plant ； 

 and, as also the compressed and disticho-alternate habit is same 

 with Isoptera (though " Haarbldttern " are alternate in twos), 

 the plant in consideration is not without some degree of affinity 

 with Pteronia. 



The structure of stichidia in our plant is quite similar to that 

 of Lophothalia which, however, differs from the present plant in 

 having " Lang-trie be " and " naarblcitterii " pro wing on all sides 



