190 22. DEYOPTERIS. § 3. CYCLOSOEUS. 



subentire towards the truncate, auriculate base, the lowest o'nes deflexed, 

 parallel. Texture herbaceous; rachis like the stipe; surfaces naked except 

 on the costae; costae nearly naked beneath; veins 2 on each side of the 

 main veins, the highest often free. Fertile fronds + 15 cm. long, ± 4 cm. 

 broad, acuminate; pinnae more acutely auriculate, cuspidate-acuminate, 

 serrate above the middle, hardly 5 mm. broad. Sori near the main veins, close ; 

 indusium bristly, cucullate, diaphanous, often peltate or with a closed sinus. 

 Borneo. 



(1206) O. peltata, r. A. v. R., in Bull. Btz., 1914, XVI, 12. . 



Rhizome ascending, brown-scaly. Stipes aggregate, + 17','j — 22'/, 

 cm. long, pubescent like the rachis, the hairs spreading, recurved, of the 

 under side more or less deciduous. Fronds lanceolate, + 20 — 25 cm. 

 long, + 6 — 9 cm. broad at or near the base, acuminate. Pinnae + 

 10 — 12 on a side; terminal pinna triangular, acuminate, crenate at the 

 apex, deeply lobed or pinnatifid at the base; lateral pinnae more or less 

 remote, horizontal or nearly so, more or less falcate, + 1 — I'/a cm. 

 broad, the higher rather adnate, the lower subpetiolate, the apex acuminate 

 in the barren pinnae, bluntish in the fertile ones, the edges parallel or 

 subparallel, serrate-crenate in the barren pinnae, coarsely dentate-crenate 

 in the fertile ones, the base truncate, distinctly auricled on the upper 

 side and sometimes also on the lower side, the auricles often crenate or 

 serrate; lower pinnae whether or not the largest, more or less deflexed. 

 Texture herbaceous; surfaces naked; under surface verruculose; costae 

 hairy above; veins 3 on a side, the 2 lower anastomosing. Sori small, 

 medial on the veins; indusium reniform with a closed sinus or more 

 commonly round and peltate. 



Sumatra. 



(120c) D. diiscophora, Ust., in Fed., Rep., XII, 172. 



Stipes + 25 cm. long, dark-stramineous, clothed like the rachis with 

 ferrugineous, lanceolate, minutely denticulate scales. Fronds elongate- 

 oblong, 2-pinnatifid. Pinnae ± 10 on. a side below the pinnatifid apex, 

 suberect, alternate, remote, long-stalked, obUquely lanceolate or linear- 

 lanceolate, long-acuminate, unequal-sided at the base, the upper base, 

 truncate, the lower cuneate; lowest pinnae largest, + 12 cm. long by 4 cm. 

 broad. Pinnulae + 8 on a side below the serrate apex, suberect, remote, 

 alternate, linear-oblong, acute, obtusely crenate or repand, cuneate at the 



