148 22. DBYOPTEEIS. § 1. LASTEEA. 



Segments 3 mm. broad, oblong, rounded at the apex, revolute at the 

 margin; lower pinnae often remote and reduced, petiolulate, central 

 sessile, lobato-dentate, higher adnate. Texture papyraceous; surfaces 

 minutely hairy ; under surface glandular ; lower veins at best anastomosing 

 in the larger pinnae only. Sori medial; indusium hirsute. 

 Mindanao. 



(3fl) O. convei'isa, «. a. v. H., in Bull., Btz., 1915, XX, 18. 



Pthizome short, clothed with lanceolate-subulate, entire, fuscous or 

 ferrugineous scales. Stipes slender, + 2 — 6 cm. long, ferrugineo-tomentose, 

 as is the rachis, the tomentum intermixed with numerous proportionally 

 long, narrowly subulate, entire, subcurved or subflexuose scales. Fronds 

 elongate-ovate, ± T'/i — 10 cm. long, ± 3 — 5 cm. broad, pinnate. 

 Terminal pinna entire, crenate or toothed towards the apex, deeply 

 pinnatifid at the base with toothed or lobed, decurrent-confluent segments ; 

 lateral pinnae toothed in the upper part, deeply pinnatifid towards the 

 base; higher and central pinnae adnate and more or less decurrent at 

 the base, the largest lanceolate, to ± 3 cm. long and 1 cm. broad, the 

 lobes entire, acute or bluntish; lowest pinnae short-stalked, broadly 

 deltoid, to ± 2 '/j cm. long, with the posterior lobes elongated, the lowest 

 posterior lobe the largest, deeply lobate-dentate. Texture membranaceo- 

 herbaceous; surfaces sparingly appresso-pilose ; rachis and costae provided 

 with scattered, narrowly subulate scales; costulae pinnate in the lobes; 

 veins simple, or forked in the teeth. Sori medial on the veins, small; 

 indusium very deeply fimbriate, consisting nearly of fibres only. 



Sumatra. 



(4a) D. (liira, Copel., in Leaf!., Ill, 805. 



Rhizome short, erect. Stipes tufted, rigid, black-purpureous, clothed 

 towards the base with black-purpureous, falcate, acuminate, broadly 

 lanceolate scales, otherwise naked. Fronds lanceolate, to + 25 cm. long, 

 4 — 8 cm. broad, acuminate, narrowed towards the base, sub-2-pinnate, 

 the rachis sparingly paleaceous, densely pubescent above. Lower pinnae 

 deflexed, abbreviate, shortly petiolate, the following sessile, lanceolate, 

 acute, minutely ciliated, cut '/,-way down to the costa, deeply 

 pinnatifid nearly to the costa in the lower part, with the lowest 

 acroscopical segment sometimes free; segments rounded, entire. Texture 

 rigid; surfaces naked; costae pubescent above; main veins pinnate ; veins 



