FERNS OF THE MALAY-ASIATIC REGION. 1 7 



and 2 or 3 times as deep; veinlets mostly forked; otherwise like 0. 

 bromeliifolia. A form found in Bengtiet, has teeth 6 mm deep. 

 Philippines, Moluccas and southern China, Japan; Kamtchatka. 



8. Osmunda javanica Bl. 



Stipe and rachis very stout; frond sometimes 3 m high and 60 cm 

 wide; larger pinna? 30 cm or more long, 2 to 3 cm broad, on stalks more 

 than 1 cm long, acuminate, cuneate at base, sinuate or entire, coriaceous ; 

 veins not pinnate but dichotomous, veinlets parallel, straight; fertile frond 

 irregularly lobed, but rarely to the costa, sporangia massed on the margin. 



Malay Islands. 



9. Osmunda vachelii Hooker. 



Stipes 15 to 30 cm high, stouter than in 0. bromeliifolia; frond 40 to 

 90 cm high; pinnae 10 to 15 cm, rarely more, long, not quite one-tenth 

 as broad, on stalks 3 to 5 mm long, acute or acuminate, acute at has.-. 

 subcoriaceous or coriaceous, entire or shallowly serrate with long, fiat 

 teeth; fertile pinnae reduced, pinnate with round or lobed pinnules. 

 Entire and serrate pinna? can be found on the same fronds. 



China, India. 



Note.— The proper definition of the species of the § Plenasium has always 

 been a puzzle. Various botanists have reduced them to a single one. If this 

 can be done, its name must be O. bromeliifolia, but O. javanica is very different, 

 I have not much fear of having made two species where I should have recognized 

 but one; but do suspect that what I have called O. vachelii will some day be 

 divided. 



(>. SCH1ZAEACE.*: 



Sporangia borne singly (not in sori), each derived from a single cell, 

 opening by a lengthwise slit; annulus a complete transverse ring at or 

 just below the apex of the sporangium ; fertile teeth or segments of the 

 frond very contracted; stems terrestrial; fronds erect or with scandent 

 rachis. Beside the following two, there are two genera in America and 

 in and near Africa'. There are about 120 known species. 



Frond scandent - ■-■ »• ******* 



Frond small, erect 2 - &****» 



1. LYGODIUM Swartz. 



Rhizome underground; leaves with scandent rachis of indefinite growth, 

 constantly dichotomous, but alternate branches on the right and left 

 almost dwarfed, and bearing a single pair of pinna?, while except at the 

 base of young leaves the main rachis or preferred branch bears no 

 pinna?; pinna? dichotomous or pinnate; sporangia borne on special teeth 

 or spikes, each with only enough lamina to cover the sporangia; in each 

 spike the veinlet is sympodially branched, the alternate branches bearing 



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