roi.vroDiK.E— Mriioi'.ons. 1 13 



3. Lower surfare nppressed — woolly. 



4. Veins hidden (3) N. achroatichoidca 



4. Veins evident (4) .V. Lingua 



3. Lower surface very sparsely pubescent. 



4. Veins evident (5) N. sphaeroatichum 



4. Veins hidden (6) .V. variua 



2. Fronds decidedly dimorphous. 



3. Sterile frond n.'arly t;lnbroiis, apntulate... (7) S. adnasvcns 



3. Sterile frond orbicular, very woolly (8) N. nuinmulariacfoliua 



1. Areolne Irregular, with Included velnlets In various 

 directions. 



2. Stipe 2 to 10 cm. high. 



3. Palere of rhizome linear, entire (9) N. aaman-nsin 



3. Palen> of rhizome ovate, serrulate (10) N. aiKjuxlatuH 



2. Frond sessile (11) N. splende»8 



(1) N. fissus Blunip. Rhizome stout, short-creeping, clothed with .^quar- 

 rosc, laiH'foliitc-iu'umiiiiitc ferruginous scales; fronds sessile or nearly so, 

 15 to M cm. higli, 1.") to :?.'> mm. broad, narrowed very gradually to both 

 ends, entire, aubcoriaceous, upper surface naked, lower densely coated witli 

 soft woolly, ferruginous tonu-ntum; veins invisible; sori close, scattered, 

 immersed among tlie tomciitum. 



Henguct, Lohcr. 

 India, Java. 



(2) N. flocciger Blume. Rhizome wide-creeping clothed with squarrose 

 laiK'euiate-acuininate scales which are ferruginous when young, turning 

 white; stipes .30 to 45 mm. high, floccose-woolly ; fronds 20 to 30 cm. high, 

 6 to li> inin. liioad. acute, attenuate to base, entire, rigidly coriaceous, upper 

 surface naked, lower densely matted with whitish or subferruginous to- 

 iiientum; veins invisible; sori immersed among the tomentum, covering the 

 upper part of the frond. 



Luzon, Cuming f)3; Sorsogon, Baranda; Mount Arayat, Merrill 3820; 

 Mount Mariveles. Whitford 312. 

 India. -lava. 



(3) N. achrostichoides (Forst.) J. Sm. Rhizome woody, wide-creeping 

 clothed with roundish or elliptical scales, black except at the margin; stipes 

 about 5 cm. high, stout, erect, glabrous or nearly so, conical at base and 

 inserted into the branch of the rhizome specialized to bear it; frond 30 to 40 

 cm. high, 10 to l") inm. broad, attenuate to both ends, entire, rigidly coria- 

 ceous, upper surface naked, lower with a closely appressed whitish tonit>n- 

 tum; veins invisible; sori distinct but contiguous, usually covering ratlier 

 more than the tipper half of the frond. 



Luzon, Cuming {SS ■=('grlophorus blumeanus Presl ?) 127; Los Bafios, 

 Lohcr; Xegros, Coprland ; Davao. Copclaiid. 



Ceylon to the New Hebrides and (Queensland. 



(4 I N. Lingua (Thunb.) .L Sm. (The Philippine form, described here 

 is I'ohjiiiidiuin hrteractis Mett. ami Kuhn.) Rhizome wide-creeping, clothed 

 with spreading, lanceolate, ferruginous scales; stipes about 10 cm. high, 

 firm, erect ; frond not much higher, oblong-lanceolate or oval, apex often 

 cuspidate, base rounded, entire, coriaceous, upper surface naked, lower 



24036 8 



