Heller : plants of the Hawaiian islands. 785 



Polypodium helleri Underw. n. sp. 



Rootstock moderately slender, creeping, clothed especially 

 when young with slender cinnamon-colored scales; petioles 

 rising at intervals of about 1.5 cm., stramineous, 10 to 15 cm. 

 long, distinctly pubescent as are the rachises; leaves 20 to 35 

 cm. long, 10 to 12 cm. wide, ovate lanceolate, parted into about 

 30 pairs of narrow linear divisions, which are 5 to 7 cm. long, 

 7 to 10 mm. wide, mostly narrower toward the base and sepa- 

 rated by a broad sinus, crenate especially toward the end; veins 

 with about three forks, occasionally uniting, mostly free; sori 

 on the primary branch of the vein, light colored, small. 



A very distinct species belonging to the same group as P. 

 pellucidum, but differs from that species in its thinner texture, 

 with sori only half as large, pinnae longer, narrower, more 

 numerous and in every way different in form and habit. 



On tree trunks and rocks just below the second fall of the 

 Wahiawa river, Kauai, at an elevation of 2000 feet. 



July 22 (2602). 



Polypodium hookeri Brack. Bot. U. S. Expl, Exped. 16:4. 



1856. 



This species is not uncommon on wet, moss-covered trees, 

 from an elevation of 2,000 feet to the summit of Konahuanui, 

 Oahu. From its habit it may be easily overlooked. 



May to November (2245). 



Polypodium lineare Thunb. PL Jap. 335, pi. 19. 1784. 



A commbn fern, ranging from the lower forests to 3500 feet 

 on Kauai. On Oahu it was found growing on exposed rocks 

 (2005, 2031), and on trees, especially on Acacia Kcra (2076). On 

 Kauai, a large broad form, with undulate margins (2533), oc- 

 curred on trees, on the ridges west of the Hanapepe river. 



Polypodium pellucidum Kaulp. Enum. Fil. 101. 1824. 

 Collected only in upper Pauoa, Oahu. On Kukui trees. 

 March (2054). 



Polypodium pseudo grammitis Gaud. Bot. Voy. Uranie. 345. 

 1830. 



A very common fern, growing on rotten logs, stumps, and 

 tree trunks, at elevations of 2000 to 4000 feet. Collected on 

 both Oahu and Kauai. 



April to October (2215). 



