22. DBYOPTEETS § 1. LASTREA. 157 



more densely on the former ; under surface very densely but very minutely 

 pilose or glandulose on and between the veins, more or less distinctly 

 hairy on the costulae, apparently glaucous Ijy the minute clothing, the 

 stipe and rachis more or less so ; costulae pinnate in the lobes ; veins 

 simple, + 9—14 on a side. Sori small, terminal on the veins or nearly 

 so ; indusium round, i. e. reniform with the basal lobes close or 

 overlapping. -- Two distinct forms: 



Forma confertiloba: Fertile lobes close or subcontiguous, not or 

 hardly dilated at the base. 



Forma laxiloba: Fertile lobes separated by sinuses often nearly as 

 broad as the lobes, dilated at the base. 



Java. 



(256) 1>. I^cysseriaua, «##., in Fed., Rep., X, 333. 



Rhizome creeping. Stipes + 50 cm. long, sparingly clothed at the 

 base with ferrugineous, lanceolate scales. Fronds ovate-lanceolate, 

 2-pinnatifid, + 1 m. long and 40 cm. broad, long-acuminate. Pinnae 

 numerous, alternate, erecto-patent, contiguous, subsessile, cut down nearly 

 to the costa, caudate-acuminate; largest pinnae linear-lanceolate, + 25 

 cm. long, 6 cm. broad, sligthly narrowed at the base; lowest pinnae 

 somewhat shorter, ovate-lanceolate; terminal pinna subulate-lanceolate, 

 deeply lobed at the base, serrate at the middle, subentire at the apex. 

 Lobes linear, straight or subfalcate, obtuse, entire or crenate, separated 

 by rounded sinuses as broad as the lobes; lower lobes somewhat 

 abbreviated. Texture thin-herbaceous to subcoriaceous ; rachis and costae 

 pale-stramineous, shortly puberulous; surfaces naked except on the veins 

 beneath; upper surface dark, glossy, lower paler, opaque; veins + 15 — 20 

 pair, suberect. simple or rarely forked. Sori large, submarginal; indusium 

 thin, short-hairy, persistent. 



New Guinea. 



(25c) See No. 68. 



(26) D. es.ig;iia, o.Uime. 



Omit the synonym Lastrea eiigua J . Sm. which is D. confusa Cojxl 



(26a?) D. courusa^, Copel., in Philipp. Journ., VI*^, 146; Lastrea 

 exigua, J. Sm.., in Journ. of Bot., Ill, 412. 



