PTERIDOPHYTA HALCONENSES. 
141 
Epiphytica 1,800 m. s. m. (No. 5989). 
A species well distinguished by the conspicuous regular venation and by the 
fertile fronds so reduced in the majority of Merrill’s specimens as to have a 
single round sorus between each two main veins. One frond, fertile towards 
the apex only, suggests a near affinity to P. caudiforme. Another possible but 
not very intimate relative is P. triquetrum. 
Polypodium commutatum Bl. 
On boulders along the Alag River at 150 m. alt. (No. 5988). 
This is identical with Cuming No. 97 from Luzon, and my No. 1582 from 
Mindanao. For the propriety of regarding it as P. commutatum Bl. ( P . affine 
Bl.) see this Journal. (1906) 1 Suppl. 163-4. 
Java. 
Polypodium Phymatodes Linn. 
Epiphytic along the Alag River at 100 m. alt. (No. 5986) ; the commonest 
Philippine form of this species, with acuminate segments. 
Africa to Polynesia. 
Polypodium palmatum Bl. 
On boulders at 800 m. alt. (No. 5981) ; epiphytic at 2,100 m. alt. (No. 5982) ; 
epiphytic and terrestrial at 2,400 m. alt. (No. 5983). 
Malaya. 
Polypodium glauco-pruinatum C. Chr. (P. glaucum Kze.). 
Epiphytic, mossy ridge forest at 1,100 m. alt. (No. 5987) . 
A most distinct species hitherto known only from Luzon. 
Polypodium albido-squamatum Bl. 
Epiphytic at 1,100 m. alt. (No. 5980). 
Malaya to New Guinea. 
This species and P. glauco-pruinatum have similar dark, long, harsh palese, 
and were growing together on the same tree. 
Polypodium ( Drynariopsis) heracleum Kze. 
Epiphytic in river forest at 100 nr. alt. (No. 6007), fronds 2.5 nr. long. 
Malaya to New Guinea. 
DRYOSTACHYUM J. Sm. 
Dryostachyum splendens J. Sm. 
Epiphytic in ridge forests at 800 m. alt. (No. 6006). 
This specimen has the expanded humus-collecting leaf-bases characteristic 
of the species and distinguishing it from D. pilosum. 7 The stipe has the vestige 
of an articulation, but even this is wanting in Luzon specimens terrestrial on 
cliffs. Its long confusion with D. pilosum makes the range of this plant ques- 
tionable. I have it from Luzon and Mindanao. 
CYCLOPHORUS Desv. 
Cyclophorus angustatus (Sw.) Desv. 
Epiphytic and on boulders along the Alag River at 150 m. alt. (No. 5996). 
Also collected by McGregor (No. 255) on the Baco River near the base of 
Mount Halcon, and in Luzon by Cuming, and by Whitford (No. 810). 
India to Polynesia. 
7 Copeland: This Journal (1906) 1 Suppl. 165, pi. 26, 27. 
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