﻿606, DICTTOPTEMS. § 1. ARCTPTERIS. 517 



2S c.M. long, slender, flexuose, canaliculate, dark-brown or blackish, hairy or 

 naked, but clothed towards the base with linear, dark-purple scales, which make 

 the stipes rough when they fall. Fronds + 3 — '10 c.M. long, + 3^9 c.M. 

 broad, simple, broadly cordate with a deep sinus, the margin entire or un- 

 dulate, the basal lobes sometimes meeting or overlapping. Texture subcoria- 

 ceous, fragile; upper surface naked or hairy, lower densely clothed with 

 spreading, reddish hairs; main veins 10 — 12 on each side, conspicuous and 

 prominent like the costa, straight, reaching the margin; veins hidden, form- 

 ing moderately regular, tetra- or pentagonal areolae with free veinlets. Sori 

 punctiform, scattered irregularly. 

 Borneo. 



* (11) ». labrusca, ». A. ». je., Bull. D^p. Agr. I.N., d908, XVIII, 

 16; Polypodium Lahrusca, Hk., Rac, Plor. Btz., I, 109; Hk., Spec. Fil., V, 

 75, tab. CCLXXXV, B; Nephrodium Labrusca, Rac, Bull. Ac. Crac, i902, 61; 

 Sagenia Lahrusca, Christ, Ann. Btz., XX, 108 ; Aspidium labrusca, Christ, Ann. 

 Btz., XV, 157; C. Chr., Ind. Pil. ; Tectaria Labrusca, CopeL, Philipp. Journ., 

 II, 410; — var. Boschae, Rac, 1. c , 61; — var. ternata, v. A. v. R., I.e. 



Rhizome woody, erect, the scales linear- or lanceolate-subulate. Stipes 

 crowded 10 — 25 c.M. long, firm, naked, erect, glossy, the base dark-coloured 

 and slightly scaly. Fronds 7 — 18 c.M. long, 6 — 15 c.M. broad. Texture sub- 

 coriaceous ; surfaces naked ; costae and main veins distinct ; areolae fine, visible, 

 copious, with free veinlets. Sori minute, scattered irregularly. — 



Forma typica : Fronds simple, cordate with a deep sinus, the edge entire 

 to sinuate, the point acute. 



Var. Ooiscliae: Stipes 20—40 c.M. long. Fronds 5-lobed, 10—55 

 c.M. each way, the base slightly cordate. 



Var. ternata : Fronds 5-foliate. Terminal segment hastato-3-fid with 

 a broad, sinuate central lobe and 2 narrow, + entire lateral ones. Lateral 

 segments free or connected with the terminal one, upcurved, unequal-sided, acu- 

 minate, the upper base cuneate, slightly rounded, the lower cordate and broadly 

 rounded, the edges ± entire. 



I think Raciborski's Nusa-Kembangan plant would better be treated as a 

 distinct species. 



Borneo, Celebes; — var. Boschae: Borneo-, — var. ierxvsXdi: Nusa-Kembangan 

 {Java). 



* (12) D. lamoeiisifi, v. A. ». jr.,* Aspidium lamoense, CopeL, Polyp od. 



