340 POLYPODIACEA'. 



/9. Pinnaa less than 2cm. long, nearly straight, more or less ascending, 



less sharply toothed. P. lept&pteron HAYATA. 



b. Fronds nearly equaling the stipes in length. 



a. Sori locating nearer the costnla than the margin ; scales nearly 



firnbriate at the base, usually subentire. P. longistipes HAYATA. 

 /9. Sori locating nearer the margin than the costa ; scales setaceous. 



P. Hancockii DIELS. 



B. The lowest pinnae are nearly the same as the others, and usually obscurely 

 pinnate. 



a. Pinnse not exceeding 1 cm. in length, usually ascending ; lower 

 margin of the pinnae divaricating from the rhachis of the fronds 

 at the angle 45. P. yceyamense MAKING. 



/9. Pinnae exceeding 1 cm. in length, usually nearly horizontal ; lower 

 margin of the pinnae divaricating from the rhachis of the fronds at 

 angles 70-90'. P. simplicipinnum HAYATA. 



Polystichum Hancockii DIELS in ENGL. u. PRANTL Nat. Pfl.-farn. 

 Pterid. p. 191 ; Ptilopteris Hancockii HANCE in Journ. Bot. XXII. p. 139 : 

 " Caespitosa, foliis tenuiter coriaceis in sicco olivaceis glaberrimis petiolo 8- 

 pollicari sordide stramineo paleis paucis setaceis pallidis hinc inde tecto, lamina 

 8-pollicari lanceolata acuminata praeter segmentum utrumque infimum 2J pol- 

 licare iterum pinnatisectum simpliciter pinnatisecta segmentis numerosis appro- 

 ximatis patenti-divergentibus 5-9 lin. longis 2 lin. latis breviter petiolatis e 

 basi inferiore dimidiato-cuneata apicem versus tantum dentata superiore auricu- 

 lata trapezio-ovata ovato-lobulata lobulis setaceo-mucronatis postico nunc sub- 

 distincto nervis semel furcatis, soris ad rami antici apicem sitis niargini potius 

 quam costulae excentrieae approximatis. In dorso montium juxta Tana-sui, Ins. 

 Formosa3, alt. 3500 ped., d. 11. Dec. 1881, rarissimam invenit am W. HANCOCK. 

 (Herb, propr. n. 22229)." 



Polystichum leptopteron HAYATA sp. iiov. (Fig. 141 et 137-a). Rhizoma 

 ascendens apice caespitosum frondigenini. Stipes 10 cm. longus. Frons 20 cm. 

 longa cruciforme trifoliolata, pinna terminali lineari-lanceolata apice caudato- 

 acuminata basi tnmcata pinnata, pinnulis lineari-quadrangularibus mediis If cm. 



