POLYPODIES HYMEXOLEPIS. 1 1 1 



sterile part about 25 cm. high, more than one-fifth as broad, margin wavy, 

 both surfaces glabrous, coriaceous; fertile segment about 5 cm. high, 

 more than one-fourth as broad, obtuse, with a broad laminal wing on both 

 sides of the fertile area. Terrestrial or epiphytic. 



Luzon, Cuming 196, Steere; Benguet, Elmer, Barnes 960; Mount Arayat 

 800 m., Loher. 



Celebes. 



(50) TAB NIT IS Willdenow. 



Rhizome creeping, hairy; stipes not articulate to it; fronds simply 

 pinnate; veins anastomosing, without free included veinlets; sori linear, 

 about midway between margin and costa, usually uninterrupted. Terres- 

 trial ferns of moderate size. Not very evidently related to its neighbors 

 here, and perhaps better transferred with Platytaenia to the neighborhood 

 of Gymnopteris. 



(1) T. blechnoides Swartz. Stipe 20 to 40 cm. high, fibrillose at base, 

 glabrous above, brown or maroon; frond 20 to 50 cm. high; pinnae 3 to 6 

 pairs, 15 to 25 cm. long, linear-lanceolate, entire, acute at both ends r sessile 

 or short-stalked, glabrous, coriaceous, bright green above, brownish below; 

 sori rather nearer the margin than the costa. 



Sorsogon, Baranda; Negros, Copeland 71; Guimaras, Cuming 277; Para- 

 gua, Merrill 719. 



Ceylon to Malaya. 



Platytaenia requiniana (Gaud.) Kuhn is a fern very like Taenitis in 

 its vegetative characters, but with the entire back of the contracted fertile 

 frond covered by sporangia. From the meager descriptions it seems likely 

 to me that it is a Gymnopteris, but Diels places it next to Taenitis. 



Philippines, Ne'e. 



Moluccas to New Hebrides. 



(51) CHRISTOPTERIS Copeland. 



Rhizome creeping, scaly; fronds dimorphous, the sterile triangular, 

 ample, the fertile tripartite into linear segments; veins anastomosing with 

 free included veinlets; sori parallel and close to the costa, linear, finally 

 covering the whole surface. Epiphytic. 



C. Sagitta (Christ) Copeland. Rhizome creeping or scandent, the 

 young part densely beset with spreading cinnamon-colored hairs about 8 

 mm. long, which are deciduous, leaving older parts sparsely clothed with 

 ferruginous scales about 4 mm. long; stipes fuscous or ebeneous, of sterile 

 frond about 10 cm., of fertile about 20 cm. high, glabrous; sterile frond 

 triangular, 15 to 20 cm. high, and broad, the points acuminate, with a trian- 

 gular sinus 2 cm. high and wide where the stipe is attached, and broad 

 shallow ones between the lateral points and the apex, glabrous, coriaceous; 

 the 3 main ribs conspicuous, their branches strictly parallel, subevident; 

 fertile frond cleft to within 1 cm. of the base into 3 narrowly linear some- 

 what spreading obtuse segments 8 to 20 cm. long, 3 mm. broad. 



Benguet, Loher; Mount Mariveles, Copeland, Whitford 321; Borden 

 Forestry Bureau 1339. 



