158 



whose definition is a matter of convenience; and in dealing with so large and 

 polymorphic a group as Potypodwm I find it most convenient to separate a minor 

 group ;is homogeneous 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. 



Rhizomate breve, snbrepente, 3-3 mm. crasso, paleia atro-brunneis lan- 

 ceolatis acuminatis ciliatis vestito; stipito 1-1.5 em. alto, 1 mm. crasso, 

 in'm ute pubeseentc, pede nigro, articulate; fronde 80-35 em. alta, 3.5-5 



cm. lata, acuta vel caudata, dcorsum in alam crenatam angustata, pro- 

 funde pinnatifida, segmentis 2-3 mm. latis, obtusis vel acutis, sursum 

 obscure scrratis, costam versus dilatatis et ala 1-1.5 mm. lata conlluen- 

 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 1:1.17. Super rivulam epiphy- 

 tica, 200 ad 000 m. s. m. 



Of the known Prosaptia*, this is the most evidently and intimately related to 

 Polypodium. It resembles P. eclebicum at least as much as /'. o^liquattun, and 

 may reasonably be regarded as descended from their not very remote common 

 ancestor. 



Prosaptia toppingii Copeland n. sp. 



Tibizomate stipiteque lit P. cryptocarpa?; fronde 20-30 em. alta, 3-1 

 cm. lata, acuta, ad alam 2-3 mm. latam piunitifida, deofsum ad alam 

 sinuatam angustata;' segmentis triangulari-lanceolatis, subacutis, ca. 5 

 mm. latis, obtuse serratis, coriaceis, subglabrescentibus ; venulis simpli- 

 cibus; soris magnis, in segmentis majoribus 9, marginalibus. (Tab. 

 lie.) 



Luzon, Bataan, monte Mariveles, Topping 377. 



A much coarser fern than our other Prosaptia;, and darker green. Two veiulets 

 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 

 sori near their apices. (Table 14b.) 



Luzon, Cuming 261 ; Province of Tayabas, Whitford 720. 



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. 



Khizomate paleis integris, basibusquc stipitum eonfertorum vestito; 

 frondibus linearibus. fere vel usque ad rhachin pinnatis; soro in pinna 

 quaque uno, ad venulam apicalc sub parte pinnae retroflexa et penitus 

 adnata immcrso, ad apicem pinnae aperto. 



Tli is genus includes three plants hitherto regarded as Prosaptiw, and described 

 under DavalUa 1>. cmllata Copeland, D. rcincckvi Christ, and D. fredcrici ct 



