﻿726 80. POLYBOTRYA. § 4. ARTHROBOTRYA. 



Rhizome woody, wide-creeping, naked. Stipes firm, erect, slightly scaly, 

 + 30 c.M. long. Barren fronds 30—80 c.M. long, 20—30 c.M. broad, oblong- 

 ovate. Pinnae numerous, articulate to the rachis, stalked, rather distant, spread- 

 ing, lanceolate, pinnate. Pinnulae rhomboidal, articulate, unequal-sided, the 

 lower base narrow-cuneate, the upper more broadly cuneate and often ± 

 auricled, the edge deeply toothed. Texture herbaceous; costae and veins con- 

 spicuous, scaly. Fertile fronds with the pinnulae contracted, blunt, often 

 sessile. 



Timor, Celebes and the Philippines across Melanesia 



SI. STTEIVOSEI^IT^, Presh 



Sori indefinite, densely covering the dorsal or both surfaces of the much 

 contracted linear segments of the fertile fronds. 



Rhizome short. Stipes not articulate to the rhizome. Fronds dimorph- 

 ous, 3 — 5-angular in general outline, the basiscopical side of the lower seg- 

 ments strongly developed; veins anastomosing + as in Pleocneraia, i, e. form- 

 ing 1 — 2 rows of areolae against the costae and costulae. Hk. Bk., Syn. 

 Fil, tab. VII, fig. 60, t— u; Diels, in Engl, k Prantl, Nat. Pfl.Fara., P, fig. 

 105, A-B. 



Malayan and Polynesian. 



$. Barren fronds fernate, ± 20—30 c.M. long. (1) S. aurita. 

 $.$. Barren fronds pinnate. 



>K. Barren fronds + 30 c.M. long. (2) S. pinnala. 



;^.^. Barren fronds 45-90 c.M. long. (5) S. Teysmanniana. 



* (1) S. aurita, JPr., Copel, Polypod. Philipp., 41 ; Pr., Tent. 

 Pterid., tab. X, fig. 24; Diels, in Engl, k Prantl, Nat. Pfl.Fam., V, fig. 105, 

 A— B: Acrosdchum auritum, Sw., Rac, Flor. Btz., I, 52; Polyholrya aurita, Bl , 

 Hk., Fil. Exot., tab. LXXXI; Gymnopleris aurita, Keys., Christ. Parnkr. d. Erde, 

 fig. 124; — var. minor, Christ, Fil. Saras., Ill, 252. 



Rhizome short-creeping or erect, firm, the scales blackish, lanceolate. 

 Sterile fronds ternate, 20—30 c.M. each way, the central segment deeply pin- 

 ualifid with oblong, blunt or acule, straight or subfalcate, entire or crenate 



