18 



OOPELAND. 



each one wit oblique sporangium and its indusium. A genus of about 

 30 species, in the tropica of both hemispheres, and reaching to New 

 Zealand, Japan and New England. 



\ eini free. 



Pinnae dichotomous or palmate. 



Pinnules cuneate at base... h Lm circinnatum 



Pinnules auriculate on the outer side o. L. »emih**tutum 



Pinnae pinnate. 



Ultimate pinnules articulate to stalks 3, L.gcandena 



Ultimate pinnules not articulate. 



Fertile fronds not more compound than sterile. 

 Dwarf-branch short or obsolete, 



Ultimate pinnules regularly pinnately lobed 4. L. polyttachyum 



Ultimate pinnules not regularly pinnately lobed.. 5. L.flewuotnm 



Dwarf-branch long ,;. L _ „„.„,.„„;; 



Fertile fronds more compound than sterile 7. L. fanonicum 



Venation reticulate. 

 Terminal segments about t> s. /,. mattketci 



Terminal segments usually 2 !l_ /. merrilli 



I. Lygodium circinnatum (Burm.) 8w, 



Dwarf-branches 111111 long; pinna' with stalks ."> cm long, more or less, 

 the sterile ones then dichotomousl v palmate hut simple, or once or twice 

 dichotomous and each division cut almost to the base into 2 or :\ lobes 

 cuneate at the base and Blightly decurrent; lobes lanceolate, acuminate, 

 entire, 10 to 30 (usually about 1")) cm long, 1.5 to I) cm wide, herbaceous 

 or siibcoriaceous, young tips hairy: veins free, close: fertile pinna? usually 

 twice dichotomous and the ultimate division deft very Dearly to the 

 base: lobes linear, lamina sometimes slightly, sometimes verv much 

 reduced, venalion lax; spikes continuous along the margin, •?-."> mm lon^. 

 brown. I suspect that L. basilanicum Christ is a dwarfed form of this 

 species. Van Alderwerelt reports from Bancs a plant seemingly Inter- 

 mediate between /,. circinatum and /,. trifurcatum Baker. L. digitatum 

 Pres] can not be distinguished as a species. 



Queensland to northern India, southern China, and the Batanes Islands. 



/,. Irifiircahin, Baker, a Melanesian plant reported from Celebes by van 

 Alderwerelt, has the spikes in groups of two or three. 



•1. Lygodium semihastatum (Cav.) Desv. 



Like /.. circinnatum in plan, but usually larger throughout, the final 



pinnules auricled on one side (sometimes on both sides) at the base, the 

 lobes less acuminate, and the sterile margins almost always finely crenate- 

 serrate. L. teyswannii \. A. v. R. is, judging by the description, rery 



like this species: in Philippine /,. semihastatum the pinna' are often 

 twice forked. 



Luzon to Mindanao and Borneo; Mariannes (?). 



