288 42 



asplenioides and the stem has a few scales, but it differs from tyi)ical ptannica by 

 its more rigid texture, the margins revolute, pinnæ auriculale at the upper base, 

 upwards only crenate, not so deeply incised as in ptarmica. It much resembles 

 D. aspidioides var. subhasta in habit. 



25. Dryopteris opposita (Vahl) Urban, Symb. Antil. 4: 14. 1903. 



Syn. Polypodium oppositum Vahl, Eel. Amer. 3: 53. 1807; Aspidinin opposilum 

 Sw. Adnot. 67. 1829; Christ, Farnkr. 252. 1897; Nephrodium oppositum Diels, Nat. 

 Pfl. 1': 172. 1899. Aspidium contermiimm Willd. sp. 5: 249. 1810; Neplirodinm con- 

 terminum Desv, Prod. 255. 1827; Bak. Syn. 268 (pt.); Dryopteris contermina O. Ktze. 

 Rev. Gen. PI. 2: 812. 1891. Aspidium polyphyllum Kaulf. Flora 1823': 362. Poly- 

 podium Plumieri Desv. Berl. Mag. 5: 316. 1811. Aspidium strigosum Fée, 11 mém. 

 78 tab. 22 fig. 2. 1866. Aspidium Riuoirei Fée, 11 mém. 76 tab. 21 fig. 3. 1866. 



Var. Polypodium rivulorum Raddi, PI. Bras. 1:23 tab. 35. 1825; Aspidium riini- 

 lorum Link, Hort. Berol. 2: 119. 1833; Mett. Pheg. und Aspid. n. 193 (part.). 



Type from Montserrat, leg. Ryan. 



Specimens examined: 



Martinique: Herb. Willd. n. 19698 (type of A. contermiimm: HB); Sieber, 

 Fl. Mart. n. 241 {= A. polyphyllum Klf.; HB); Hahn n.23 (HB). 



Guadeloupe: L'Herminier n. 153 (= A. striyosum Fée; HC); another specimen 

 leg. L'Herminier is A. Rivoirei Fée (HB); Père Duss n. 220 (HC). 



St. Vincent: Eggers n. 6753 (HC). 



Grenada: Eggers n. 6028 (HC). 



Montserrat: Ryan (HH, an type specimen?). 



Puerto Rico: Sintenis n.3977 (HB). 



Cuba: Wright n. 820 pt. (HS). 



Mexico: Colipa, Prov. Vera Cruz, Liebmann (HH). — Jalisco, Pringle 

 n. 11794 (HC). 



Costa Rica: Rio Virilla, Prov. San .lose, 3200', Donnell-Smith n. 5089 (HC). — 

 Rio Turrialba, Prov. Cartago, 1600', Donnell-Smith n. 5087 (HC). - H. Pittier 

 n. 10488 (HC). 



Columbia: Lehmann n. 741 (HB), 4429, 5709 (HB. HC). - Lindig n. 354 (HB). 



Venezuela: Borckel, Kosas, Preuss n. 1670 (HB). 



Peru: S. Gavan, Lechler n.2662 (HB). — Pöppig (HB). 



Bolivia: Near Coroico, M. Bang n. 2316 (HH. HB). 



Brasilia. A large number of specimens, especially from the southern pro- 

 vinces and all belonging to var. rivulorum. 



The typical form is also recorded from Florida. 



D. opposita is extensively misunderstood by most pteridologists, and the bundles 

 in herbaria of specimens called "■conterminnm" include a mixture of widely different 

 species. The species is recorded from all countries of tropical America, but it is 

 in general impossible to say what the authors may have meant by their conter- 



