188 22. DRYOPTERIS. § 1. LASTHAEA. 



Var. Hallieri : Fronds smaller ; pinnae narrower, the lower ones 

 narrowed towards the base ; rachis di'ciduously scaly like the stipe ; pinnae 

 pubescent on the costa and slightly so at the margin; sori superficial, the 

 lower ones divaricating. (Hallier No. 248, determined by Burck as Aspidium 

 immersum, BL). 



Borneo. 



* (22) B. iinntersa, O. ir««e, C. Chr , Ind. Fil. ; Aspidium immer- 

 sum, BL, Rac, Plor. Btz., I, 169; Laslraea immersa, Moore, Bedd., Handb. Ind. 

 Ferns, 234; Nephrodvum immersum, Hk., Hk. Bk., Syn. Fil., 263. 



Rhizome short-creeping. Stipes approximate, 70—120 c.M. long, glossy, 



^ slightly scaly at the base. Fronds 80—200 c.M. long, 30—70 c.M. broad, 



c ovate-oblong. Pinnae sessile, 2 — 4 c.M broad, almost horizontal, acuminate or 



I nearly caudate, cut down nearly to the costa into ± close, spreading or nearly 



gj spreading, straight or subfalcate, subacute, linear lobes 2 — 5 m.M. broad. 



w. Texture herbaceous; upper surface naked or provided with distant, inconspi- 



% cuous hairs; under surface and rachis provided with minute, yellow, glandular 



dots or stifif, white hairs. Sori near the margin, 1 to each vein, much 



immersed as to project on the upper surface; indusium persistent, reniform, 



the basal lobes overlapping. 



Malaya. 



« (23) D. Peekeli, r. jl. r. jk. 



Stipes ± 10 c.M. long, naked or slightly glanduloso-pilose. Fronds lan- 

 ceolate or Tiovate, ± 30—40 c.M. long, 15—20 c.M. broad. Pinnae 18— 22 

 on each side below the deeply pinnatifid apex, linear-lanceolate, the central 

 ones the largest, rather spreading, acuminate, 1 — 1 '4' c.M. broad, sessile or short- 

 stalked, cut down neai'ly to the costa into linear-oblong, erecto-patent or sub- 

 spreading, entire, bluntish segments 1 ^j^ — 2 m.M. broad, the lowest lobes not 

 or hardly shorter. Lowest pinnae shorter, deflexed, with the lowest segments 

 free and only the lowest anterior 1 broader and deeply toothed or pinnatifid. 

 Texture thin; rachis and surfaces finely shortrhairy ; veins 8 — 10-jugate, simple. 

 Sori submarginal, solitary at the base of the lobes or numerous along the 

 edges; indusium villose. 



New Guinea (Peekel, No. 44). 



(24a) D. Dayi, C. Chf., Ind. Fil.; Aspidium Dayi, Bedd., Journ. of 

 Bot., XXVI, 4; Laslraea Dayi, Bedd., Handb. Ind. Ferns, Suppl., 54; Nephro- 

 dum Dayi, Bedd., Journ. of Bot., XXV, 323. 



