whose clelinitioii is a matter of convenience; and in dealing with so large and 
polymorphic a group as Polypodium I find it most convenient to separate a minor 
group as homogeneons and easily defined as this, in spite of intimate and clear 
affinity, rather than to stretch the definition of the larger group to include it. 
Prosaptia cryptocarpa Copeland n. sp. 
Eliizomate breve, subrepente, 2-3 mm. erasso, paleis atro-brunneis lan- 
ceolatis aciiminatis ciliatis vestito; stipite 1-1.5 cm. alto, 1 mm. erasso, 
minute pubeseente, pede nigro, articnlato; froiide 20-35 cm. alta, 3.5-5 
cm. lata, acuta vel eaudata, deorsum in alam crenatam angustata, pro- 
funde piunatifida, segmentis 2-3 mm. latis, obtusis vel acutis, sursum 
obscure serratis, costam versus dilatatis et ala 1-1.5 mm. lata confluen- 
tibus, coriaceis, subglabris; venis inconspicuis, venulis simplicibus; soris 
in segmentis majoribus 18-25, marginalibus vel submarginalibus. (Tab. 
14 a, d.) 
Mindanao, Zamboanga, San Ramon, Copeland 1557. Super rivulam epiphy- 
tica, 200 ad 600 ni. s. m. 
Of the known Prosaptiw, this is the , most evidently and intimately related to 
Polypodium. It resembles P. celebicum at least as much as P. obliquatum, and 
may reasonably be regarded as descended from their not very remote common 
ancestor. 
J Prosaptia toppingii Copeland n. sp. 
Ehizomate stipiteque ut P. cryptocarpse ; fronde 20-30 cm. alta, 3-4 
cm. lata, acuta, ad alam 2-3 mm. latam pinnitifida, deorsum ad alam 
sinuatam angustata; segmentis triangulari-lanceolatis, suliacutis, ca. 5 
mm. latis, obtuse serratis, coriaceis, subglabrescentibus ; venulis simpli- 
cibus; soris magnis, in segmentis majoribus 9, marginalibus. (Tab. 
14c.) 
Luzon, Batann, monte Mariveles, Topping 377. 
A much coarser fern than our other Prosapticc, and darker green. Two veinlets 
sometimes unite in an apparently simple sorus. This plant was incorrectly re- 
ferred to P. alata (Blume) in my Polypodiaceae of the Philippine Islands, page 53. 
Prosaptia alata. (Blume) Christ is intimately related to the two species just 
described. It has rather narrower fronds with very obtuse segments bearing few 
soil near their apices. (Table 14b.) 
Luzon, Cuming 261; Province of Tayabas, Whit, ford 726. 
Prosaptia, contigua, Presl is our remaining species. The. fronds are cut nearly 
or quite to the rachis into usually toothed segments. It is rather common 
throughout the Islands. 
\/ ACROSORUS Copeland, genus novum. 
Bhizomate paleis integTis, basibusque stipitum confertorum vestito; 
frondibus linearibus, fere vel usque ad rhaebin pinnatis; soro in pinna 
quaque uno, ad venulam apicale, sub parte pinnae retroflexa et penitus 
adnata immerso, ad apiceni pinnae aperto. 
This genus includes three plants hitherto regarded as Prosaptiw, and described 
under DavaUia — D. cxaltata Copeland, D. reineckei Christ, and D. frederici et 
