﻿436 S4. ATHYRIOM. 



Rhizome erect. Stipes firm, erect, naked, dark-brown, to + 70 c.M. 

 long or longer. Fronds subdeltoid, 60 — 200 c.M. long, 30 — 120 c.M. broad. 

 Lower pinnae to 60 c.M. long, T'/j — ^0 c.M. broad, pinnate. Pinnulae slight- 

 ly stalked, 1—3 c.M. broad, narrowed towards the apex, cut down ^/j or 

 more on the way to the costa into close or nearly close, linear-oblong, blunt, 

 toothed, subfalcate segments, which are to + l'/2 c.M. long, to + Yj c.M. 

 broad. Texlure herbaceous; rachis and surfaces naked; main veins pinnate 

 in the lobes; veins simple or forked. Sori oblong, short, close to the costu- 

 lae, the lower ones often double, close to the midribs, not reaching more 

 than Va'way the edge; indusium ciliate or eroso-fimbriate. — Resembles Di- 

 plazium polypodioides, BL in habit (Bk.). 



Java, Celebes, Philippines. 



55. .a^sflejivium:, £«t»n^. 



Sori linear or linear-oblong, straight or slightly recurved, springing from 

 the sides of the veins, oblique to the costa, or occupying the sides of the single 

 central veins of linear ultimate segments, only 1 sorus to a vein. Indusia 

 of the same shape as the sori, springing from the same sides of the veins, 

 opening obliquely towards the costa or occasionally towards the margin. 



Rhizome creeping or erect, the scales coarsely cancellate, with the areolae 

 mostly decoloured, i. e. the cells with the side walls conspicuously thickened 

 and mostly brown-coloured, the lumina generally pale or decoloured (Sadeb., 

 in Engl. & Prantl, Nat. Pfl.Fam., 1\ fig. 40, B). Stipes not articulate to the 

 rhizome, with 1, or 2 free, + -concave vascular bundles, which mostly unite 

 towards the lamina (or higher) into a single tetrarchous one [ ) ( , )( , )-( , 

 ) — ^» X' \/j \ / ]• Fronds simple oi* divided; veins free or rarely anas- 

 tomosing. Hk. Bk., Syn, Fil , tab. IV, fig. 38, a-c, h. 



Cosmopolitan. 



Arrangement of (he sections. 



§ 1. THAMNOPTERIS. Vein tips united by a ± marginal strand or an intra- 

 marginal line. Fronds simple. Diels, in Engl. & Prantl, Nat. Pfl.Fam., 

 I*, fig. 125, E. 



§2. NEOTTOPTERIS. Veins free. Fronds simple. Diels, I.e., fig. 125, F— G. 



