POLYPODIACE^E. 307 



obtusissiinis basi obliquis latere superiore auriculatis latere inferiore cuneatis 

 subsessilibus margine crenulatis ad sinus crenarum setula singiila instructis 

 (setulis 1-2 mm. longis recurvis ascendentibus) supra glabris subtus ad costulas 

 sparse squamatis ; pinnis infimis brevioribus plus minus deorsum reflexis superi- 

 oribus gradatim brevioribus versus apicem abrupte reductis ad dentem acuminis 

 abeuntibus ; rhachis semper alata cum alis If mm. lata ; costis rhachis vel pinnas 

 supra plus subtus minus elevatis gracilibus. Fr. fertilis: stipes quam is sterilis 

 duplo longior ; frons linearis 8-12 cm. longa 1-2 cm. lata pinnata apice obtusa 

 basi truncata, pinnis oblongis vel ellipticis vel plus minus elongato-oblongis 3- 

 10 mm. longis 2-5 mm. latis apice obtusissimis basi rotundatis vel leviter 

 cordatis membranaceis suboppositis vel alternis inferioribus a se 1cm. remotis 

 superioribus plus approximatis subtus dense soriferis, venis soriferis baud vel 

 vix incrassatis ; textura rigide membranacea, rhachis haud alata, pinnis brevis- 

 sime petiolulatis. 



Polybotrya appendiculata HAYATA, in HAYATA et MATSUM. Enum. PI. 

 Formos. p. 585 (non J. SM.). 



HAB. Inter Urai et Kahao, leg. K. MIYAKE, Oct. 1899; Kotosho, Loo-choo: 

 Okinawa. 



The present fern accords exceedingly well with the figures given in BLUME'S 

 Florae Javse. This and the preceding species were previously confused and 

 altogether regarded to be identical with P. appendiculata. After studying a 

 number of the ferns, I have found that there are clearly two forms which are 

 very constant and do not seem to be variable from one to the other. One 

 form represented by P. duplicato-serrata HAYATA has the much longer fronds, 

 wingless rhachis and incrassate soriferous veins, while the other, the present 

 species, has always much smaller sterile fronds with winged rhachis and very 

 slightly incrassate soriferous veins. The former differs from P. appendiculata in 

 the pinnae, which are always acuminate at the apex, while the latter accords 

 X)retty well with the description of the same species given in HOOKEK'S Sp. Fil. 

 V. p. 251. According to HOOKER," CHRIST 2) and DIELS, S) P. appendiculata is 

 in the highest degree variable. The description of HOOKER includes many 



1) HOOKER, W. J. Species Filicum V. p. 251. 



2) CHRIST, H. Famkrauter der Erde p. 43. 



3) DIELS, L. ENGL. u. PRAXTL Nat. Pfl. fam. T.-4, p. 196. 



