22. DRYOPTERIS. § 1. LASTREA. 165 



(40&) See under No. 29. 



(41«*) O. flavovireiis, Ust., in Fed., Rep., X, 334. 



Rhizome erect; scales lanceolate, ferrugineous, short-hairy at the 

 apex. Stipes stramineous, + 60 cm. long, sparingly scaly at the base, 

 furfuraceous and sulcate on the upper side. Fronds lanceolate-oblong, 

 ± 75 cm long, 25 cm. broad. Pinnae ± 20 pair below the terminal 

 one, suberecto-patent, sessile, linear-lanceolate, acuminate, cut down 

 nearly to the costa; central pinnae largest, + 30 cm. long, 3 — S'/j cm. 

 broad; lower pinnae somewhat shorter, subopposite, ± 6 cm. apart; 

 higher pinnae approximate, alternate; terminal pinna pinnatifid at the 

 base, entire towards the apex. Lobes numerous, spreading, subapproximate, 

 separated by acute sinuses, linear-oblong, crenato- or inciso-lobate, the 

 apex subentire, obtuse; lobules rounded, sparingly ciliolate. Texture 

 herbaceous ; colour yellow-green ; surfaces naked ; rachis stramineous ; 

 costae hirsute above; costulae sparingly hairy; veins + 12 on a side, 

 the lower pinnate in the lobules, the higher forked or simple. Sori 4 — 5 

 on the lower lobules, 2 — 3 on the central ones, medial (?); indusium 

 membranaceous, whitish, fimbriate and glandular at the edge. 



New Guinea. 



(42j D. flissecta. O. Rtise; D. Raciborskii, v. A. v. R. ; Aspidium 

 sagenioides, Rac. mot Mett.); (not Nephrodium conjugatum, T. & B). 



Rhizome erect. Stipes to 30 cm. long or even much longer, 

 sparingly deciduously subulate-squamulose, often fibrilloso-pilose like the 

 rachis. Fronds deltoid to ovate, 30 — 150 cm. long, 15 — 90 cm. broad, 

 pinnate. Pinnae few to numerous; higher pinnae linear, lobed or 

 pinnatiiid to ± '.j-waw down to the costa, adnate and decurrent, or 

 connected by short intermedial lobules (i.e. the tops of the sinuses between 

 the higher primary segments are provided with a lobe-like tooth' ; central 

 pinnae linear-lanceolate, pinnatifid form '/j-way down to nearly to the 

 costa with deltoid-oblong or linear-oblong, blunt or acute lobes; at least 

 the lowest pinnae often stalked, and pinnate at least on the lower side 

 at the base, otherwise pinnatifid, with at least the lowest posterior 

 pinnula elongated and pinnatifid or 2-pinnatifid again. Lobes to 2 — A 

 cm. long, 72 — ^\ cm. broad, the largest crenulate, toothed or not deeply 

 lobed. Texture herbaceous; surfaces often, though not invariably, 

 fibrilloso-pilose ; costulae and main veins forked or pinnate in the ultimate 



