166 19. POLTSTICHUM. 



* (5) p. aculeatnm, Schott (not Rolh), Copel., Polypod. Philipp., 

 17; Diels, in Engl. & Prantl, Nat. Pfl.Fam., I*, fig. 100, A; Aspidium aculea. 

 turn, Sw., Hk. Bk., Syn. Fil., 2S2; — var. vulcanicum; A. i-u/crtJiJcum, M, Enum., 

 165;' — vai". subamoenum, Christ, in Warb., Mons., I, 77; — vai". mucroni- 



folium; A. mucronifolium, Bl., Rac, Plor. Btz., I, 172; — var. moluccense; 



A. moluccense, BL, 1. c, 168; — var. batjanense, Christ, 1. c. ; A. baljaneme, 



Christ, Bull. Herb. Boiss., 2e Serie, VI, 996;! P. horizontals, Copel., 1. c, 18. 



Rhizome erect or suberect, strong, scaly. Stipes tufted, scaly, 10 — 100 



c.M. long; the scales of 2 forms, the smaller ones slender, resembling hairs 



or fibrils, the larger ones ovate-lanceolate, thin, both ferrugineous. Fronds 



50 — 80 c.M. long, 18 — 40 c.M. broad, 2-pinnate, sometimes 5-pinnate, ovato- 



laiiceolate to deltoid, acuminate. Pinnae close, numerous, + linear-lanceolate, 



the lowest commonly the longest, 2 — 4 c.M. broad neai' the base. Pinnulae 



subrhomboidal, close, regular, the upper base truncate, + auricled, the lower 



base cuneate, the margin toothed, the apex and the teeth mucfonate or aris- 



tate. Texture ± coriaceous; rachis densely, ± deciduously scaly, the scales 



linear-lanceolate, ferrugineous, acuminate, often mixed with white or reddish, 



± hair-like smaller ones; under surface naked or slightly fibrillose. Sori in 



1 row on each side, ± medial or subcostal. — A variable species. — 



a. Pinnulae at best pinnatifid, the auricle not free. 



b, Pinnulae not pinnatifid. 



Forma typica: Pimmlae ari state. Sori + medial or subcostal, not soli- 

 tary . — ' Cosmopolitan. 



War. vulcanicuni : Piimulae rather small, subimbricale, spinuloso- 

 denlate, obscurely auricled. Sori solitary. — Java, Sumatra. 



h.h. Pinnulae incised. 



War. sultaiuoeniiiu: Philippines. 

 a.a. Pnnulae more or less dimded, at least the auricle + free. 



War. iiiucroniroliiiin : Under surface slightly paleaceo-pilose ; pin- 

 nulae small, at best once pinnate. — Malaya; Br. India. 



War. moluccense: Under surface sparingly furfuraceous; pinnulae 

 once pinnate. — Moluccas, Philippines. 



War. batjanense: The whole plant densely clothed with cinnamon- 

 coloured scales; pinnulae large, + S c.M. long, the lowest pinnate or 2- 

 pinnatifid. — Baljan, Philippines. 



* (4) P. obtiisnm, J. Sm. (not Pr.), Copel., Polypod. Philipp., 17; 

 Aspidium ohlusum, Kze (not Melt), Hk. Bk., Syn. Fil., 252, Mett., Farng., IV, 



