NO. 1867 AMERICAN FERNS — CHRISTENSEN 377 



size and less falcate segments. It is Polypodium litigiosum Lieb- 

 mann and Lastrea leiholdiana Presl, according to the original speci- 

 mens of these. The second form I name : 



DRYOPTERIS PANAMENSIS PROXIMA C. Chr., var. nov. 



Leaf with a very short stipe, reduced downwards as in typical 

 panamcnsis, glandular beneath, almost wholly glabrous. Pinnae 

 about 10 cm. long, short-acuminate, the upper ones alternate; seg- 

 ments approximate, oblique, not falcate, oblong-triangular, acute, 

 the basal ones equal sized or a little prolonged. 



The type specimen of this was collected by H. Ross (no. 326) in 

 Mexico: Cuernavaca ad riv. umbr. c. 150 m. (Herb. Munich) and 

 was by me considered a distinct species. Another specimen, in the 

 U. S. National Herbarium, also from Mexico, Rose and Painter 7320, 

 from the vicinity of Guadalajara, State of Jalisco, is, however, evi- 

 dently the same, but connects the type with D. panamcnsis; therefore 

 I now prefer to give to these specimens the varietal name proxima, 

 originally used as a specific name. Further specimens are : Pringle 

 1844, from wet places near Guadalajara, State of Jalisco, and prob- 

 ably Pringle 11794 from the same locality, Sept., 1903, which is a 

 slender and more hairy form, in habit more resembling D. opposita. 



By its almost completely glabrous leaf, short-pointed pinnse, and 

 closely placed oblong-triangular acute segments, this variety seems 

 very different from true D. panamcnsis. 



DRYOPTERIS LEUCOTHRIX C. Chr., sp. nov. 



Bolivia: Near Yungas, 4,000 ft., H. H. Rushy 432, type; U. S. National 

 Herbarium, No. 828993. 



Eudryopteris rhizomate (?). Stipitibus 2-3 dm. longis, rigidis, 

 angulatis, breviter crispato-pilosis, fusco-stramineis. Lamina lineari- 

 lanceolata, 6-y dm. longa, medio 16-18 cm. lata, versus basin longe 

 et gradatim attenuata, submembranacea, crassiuscula, siccitate 

 brunnea, rachi profunde sulcata molliter crispato-pilosa, bipinnatifida. , 

 Pinnis numerosis, oppositis vel sursum alternis, sessilibus, inferiori- 

 bus 6-7 jugis gradatim reductis, infimis minimis, medialibus maximis, 

 inter se 2 cm. remotis, linearibus, 8-9 cm. longis, 8-9 mm. latis, 

 acuminatis, ubique (maxime ad costas) pilis albidis brevibus hirtis, 

 ad alam vix i mm. latam pinnatifidis. Laciniis numerosis, recte 

 patentibus, sinubus latis rotundis separatis, obtusis vel rotundatis, 

 marginibus integris paulum revolutis, basalibus aequalibus. Venis 

 simplicibus ca. 5 jugis indistinctis. Soris medialibus vel pauluin 

 inframedialibus ; indusiis persistentibus, pilis albis valde pilosis. 



