116 10. LYGODIUM. § 1. EULYGODIUM. 



the stalk margined, deciduously short-hairy. Spikes in continuous rows 

 along the edge; spores minutely verruculose. 



Forma typica: Leaflets 15 — 20 cm. long by 1'/, — 2V2 cm. broad. 



Forma samarindae: Leaflets 25 — 35 cm. long by S% — 5 cm. broad. 



Borneo. 



(5) Ij. Irifurcatuin, BU. 



See also No. 3. 



(5a) I*, dimorphutti, Copel., in Philipp. .Journ., VF, 67; L. 

 novo-guineense, Rst.^ in Fed., Rep., IX, 427. 



Primary petioles very short or obsolete, secondary ones about 1 — 2 

 cm. long. Barren pinnae forked, the pinnulae stalked, simple or (mostly 

 the posterior ones) forked again, the stalks narrowly marginate, 

 deciduously hairy. Ultimate segments free or connected, sessile or short- 

 stalked, linear-lanceolate, 8 — 20 cm. long, 1—2 cm. broad, acuminate, 

 minutely serrulate, truncate or cordate or more commonly cordate- 

 auriculate on the outer side at the base, the auricles rounded or 

 generally conspicuously arcuate-decurvate. Texture firm; costae and 

 veins naked, or provided beneath with scattered, deciduous hairs. Fertile 

 pinnae forked or pinnate, the branching between compoundly pinnate 

 and dichotomous; all the divisions much contracted, without lamina or 

 nearly so, the pinnae therefore paniculiform. Spikes short, to 3 mm. 

 long; spores tuberculate (after Rst. smooth or obscurely reticulate). — A 

 duphcate of Copland King's No. 134, occurring in the Buitenzorg Herbarium, 

 has the spores verruculose. A plant from Skroe (coll. Prof. Dr. M. Treub) 

 bears on the very same rachis: a, sterile and fertile pinnae like those 

 of Copland King's No. 134; b, fertile pinnae like those of L. semihastatum 

 Desv. but sparingly spiciferous only; c, fertile pinnae more or less 

 resembling those of L. trifurcatum Bk. as intermediates between those 

 mentioned under a and b. — It may be possible, that L. dimorphum is 

 a very compound form of L. semihastatum and that Treub's plant 

 unites both extremes as well as the intermediates, but I don't know 

 whether the true Philippine L. semihastatum ever reaches the compound 

 development of the Papuan L. dimorphum. 



Neiv Guinea, Amboina. 



(5&?) Wj. iUoiszkowgtkii, Brau., Lautb., Beitr. Flor. Pap., I, 57. 



