Heller : PLANTS OF THE HAWAIIAN ISLANDS. 771 



FILICALES.* 



OPHIOGLOSSACEAE. 

 OPHIOGLOSSUM L. Sp. PL 1062. 1753. 



Ophioglossnm pendulum L. Sp. PI. 1062. 1753. 



On reclining tree trunks and protruding roots, never at any 

 distance from the ground, in woods above Manoa, Oahu, at 

 2000-2500 feet elevation. 



April to November (2217). 



POLYPODIACEAE. 

 ACROSTICHUM L. Sp. PL 1067. 175:;. 

 Acrostichum conforme Swz. Syn. FiL 10:192, pi. J,f.l. 1806. 

 Hillebrand says this fern is "rather rare." On the plateau 

 above Waimea, Kauai, it is plentiful at 4000 feet elevation, 

 growing either on the ground or on trees. It was not seen at 

 lower elevations, and apparently does not occur on Oahu on 

 the main range. 

 October (2808). 



Acrostichum gorgoiioum Kaulf. Enum. FiL 63. 1824. 



First collected in wet wood between the Wahiawa and Hana- 

 pepe rivers, at about 2000 feet elevation, where it is rather 

 common, growing on the ground and rotten logs. It is also 

 common at 2000 feet in similar situations above Manoa and 

 Pauoa, Oahu. Above Waimea, Kauai, only a few plants were 

 seen, at 4000 feet elevation. 



July to November (2622). 



Acrostichum helleri Underw. n. sp. (Plate XLII.) 



Rootstock stout, creeping, densely covered with dark brown, 

 crisped scales; petioles of sterile leaves rising at intervals of 

 about 1 cm., 2-3 cm. long, naked, stramineous; sterile leaves 

 20-25 cm. long, 3-4 cm. wide, blunt at the apex, tapering to- 

 ward the base, the margin entire; texture coriaceous; veins 

 free, once or occasionally twice forked, about 1 mm. apart; 

 surfaces smooth, glaucous green; petiole of spore bearing leaf 

 8-10 cm. long, gradually margined by the narrow leaf which is 

 about the length of the sterile one but only 2-5 cm. wide, taper- 

 ing gradually upwards, the apex somewhat acute and the 

 margin recurved. 



•The determination and Bynonomy by Professor Lucien M. Underwood. 



