392 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 52 



Poly podium ctcnoides (Fee) Jenman from Jamaica I have sup- 

 posed in my "Revision" to be this species, and the three specimens 

 at hand {Jenman; Hart 343) confirm that opinion; I see no essen- 

 tial difference. Maxon 267 from Costa Rica is identical with the 

 narrow-leaved form collected by Biolley (no. 67 in part) which in 

 my "Revision" I referred to D. lasiopteris (Sod.) C. Chr. Also, I 

 now consider this form to belong to the species of Sodiro, although 

 this author describes D. lasiopteris as being indusiate, while our 

 Costa Rican specimens are without indusia; but I cannot see any 

 important dift'erence between this form and ordinary D. rudis. It 

 is almost glabrous above and has shorter pinnae, while the most 

 common form of D. rudis is setose throughout; probably D. lasiop- 

 teris (Sod.) C. Chr. must be reduced as a synonym of D. rudis. 



Another synonym of D. rudis is Aspidium subdecussatum Christ,^ 

 as shown by the type specimen from Costa Rica, Alfaro 16556. It 

 is glabrous between the veins upon both sides, and identical with 

 the form which I have called D. lasiopteris. 



D. rudis varies considerably in size and in density of pubescence. 

 From D. pterifolia it can be distinguished by its acute segments and 

 by its costae being clothed beneath with antrorse (not patent) hairs. 



A large variety, eventually a new species, is Pringle 8920, Mexico 

 (State of Puebla, by brooks in pine forests, near Honey Station, 

 5,000 ft.). It has pinnae 25 cm. long by 3.5 cm. broad. 



Nephrodium tctragonum PresP has been much misunderstood. 

 It is, according to the type specimen in herb. Presl, not at all the 

 same as Nephrodium tetragonum Hook (which is Dryopteris pseudo- 

 tetragona Urban), but either D. rudis or a closely related species. 

 The whole type specimen consists only of the upper half of a single 

 leaf, and is therefore rather indeterminable. 



DRYOPTERIS HEIMERI C. Chr. 



I have recently described^ this Brazilian representative of D. rudis. 

 The diagnosis and comments are here reprinted without change. 



"Eudryoptcris e turma D. rudis (Kze) C. Chr. rhizomate (erecto?) dense 

 radicantc. Stipitibus ad pinnas infimas abortivas c. 15 cm longis, fusco- 

 stramineis, quadrangularibus, ubique brevissime hirtis, ad basin squamis nigro- 

 brunneis ovato-acnminatis marginibus sparsim ciliatis subdense vestitis. 

 Lamina lanceolata, ad 8 dm longa, medio 17 — 18 cm lata, ad apicem pinnati- 



\-lspidiitJii siihdccussatiiin Clirist, Bull. Herb. Boiss. II. 4:960. 1904; Dryop- 

 teris sitbdcciissata C. Chr. Ind. Fil. 295. 1905. 

 ■Rel. Haenk. 1:35. 1825. 

 ■'' Fedd., Rcpcrtarinm 6:380, 3S1. 1909. 



