BENEDICT : ANTROPHYUM 455 
Jenman refers to this plant as large A. sudsessile,* but it is 
really one of the most distinct in the group, and it is hard to see 
how he could confuse it with the small thin form which occurs in 
Jamaica. It is the largest American species in the genus and is 
easily recognizable by its open marginal areolae, and its flaccid 
texture. 
8. ANTROPHYUM ANETIOIDEs Christ, Bull. Herb, Boiss. II. 5: 12. 
1905. (Type from Costa Rica.) 
Spores triplanate ; paraphyses wanting ; sporangia in simple or 
branching, more or less connected, superficial lines divergent from 
the axis ; fronds elliptic-lanceolate, 15 x 2.5-18 x 3.5 cm., acute 
(often blunted), rather thin, flaccid, friable when dry, opaque, 
sessile; margins very slightly reflexed; costa usually disap- 
pearing before the upper third, and scarcely visible even by trans- 
mitted light near the apex; areolation rather distinct; areolae 
divergent at a narrow angle from the axis ; marginal areolae open. 
Costa Rica: Las Vueltas, A. Tonduz 12757. 
Thanks to Dr. Christ’s kindness in loaning me authentic ma- 
terial of this species, I have had opportunity to examine it at first 
hand and to compare it point by point with the related species. 
It differs from A. brasilianum, as he says, in texture and outline. 
In two other characters it is also easily distinguishable from this 
Species, in its open marginal areolae, and indistinct costa. In its 
costal characters it is particularly interesting as suggesting a 
transition between the New and Old World species of this genus. 
In the species of the latter region, a costa is present usually only 
in the stipe or lower part of the frond. In the lamina, as a whole, 
Or at least in the upper part, it becomes indistinguishable or can 
be traced only as a vein no larger than: any other in the general 
network of the leaf. This is practically what happens in A. ane- 
ttoides. The costa is nowhere prominent, and a little above the 
middle of the frond it can be distinguished only by transmitted 
light, while towards the apex it becomes no larger than the lateral 
Veins. 
9. AnTRopHyum piscoipeum Kunze, Bot. Zeit. 6: 702. 1848. 
(Type from Colombia, Karsten.) 
Spores triplanate ; paraphyses wanting ; sporangia in simple 
_ Wavy or branching superficial lines, sometimes considerably con- 
* Bull. Dept. Bot. Jam. Il. 4: 211. 1897. 
