254 202 



254. Dryopteris SchaflFneri (Fée) C. Chr. Ind. 291. 1905. — Fig 41 e. 



Syn. Nephrodium Schaffneri Fée, 8 mém. 108, 1857; 10 mém. 44. tab. 43. 

 Aspidium varians Mett. ; Kuhn, Linnaea 36: 114. 1869! 

 Aspidiiim imbricatum Fourn. Mex. pi. 1: 96. 1872! 

 Dryopteris imbricata C. Chr. Ind. 271. 1905. 



Type from Mexico: Mirador, leg. Schaffner nr. 244 (non vidi). 



A distinct species, in habit not unlike D. tristis, but well-marked by its pecu- 

 liar indusia; in other respects it is very variable. Rhizome creeping. Lamina with 

 3—6 pairs of lateral pinnæ and a similar terminal one. Pinnae 15—25 cm long, 

 3—4 cm broad, stalked, incised about halfway to the midrib into falcate, acute or 

 obtuse segments. Pubescence variable; some specimens are practically quite glabrous 

 {= \ar. glabrescens Fourn. I.e.); others have long, whitish, patent hairs on costæ and 

 veins beneath; rachis shortly pulverulent; under-surface verrucose. Venation va- 

 riable; veins about 15 to a side, simple or, not rarely furcate, the lowest 3—6 con- 

 nivent to sinus, those of the basal pair often truly anastomosing. Sori nearest the 

 margin, furnished with a persistent, flat, ciliate, variable indusium; in same pinnæ 

 one can find as well reniform as athyrioid or even asplenioid indusia. 



I have no doubt that A. varians Mett. = A. imbricatum Fourn. (not Polypodium 

 imbricatum Liebm., which is D. tetragona) is identical with N. Scha/J'neri Fée; this 

 is the glabrescent form, while A. varians is hairy as described above. — The species 

 is apparently a rare one and confined to the humid forests of south-eastern Mexico. 

 I have seen the following specimens: 



Mexico: San Luis Potosi, Virlet nr. 82 (B, Herb. Mus. Paris) — Misantia, L. Hahn nr. 623 (B, Herb. 

 Mus. Paris) - Cordoba, Kerber nr, 86 a (B) — Mirador, Schaffnkr, Müller, Sartorius (B) — 

 Vicinity of Gomez, Farias, Tamaulipas, Edw. Palmer nr. 298 (W). 



255. Dryopteris vivipara (Raddi) C. Chr. Index 300. 1905 — Fig. 43 c. 



Syn. Polypodium viviparum Raddi, PI. bras. 1: 22 tab. 32. 1825. 



Polypodium diversifolium Sw. Vet. Akad. Handl. 1817: 60 (non alior.). 

 Polypodium proliferum Klf Enum. 107. 1824. 

 (For other synonyms see Index Filicum). 

 Type from Southern Brazil. I have seen the original specimens of P. diversi- 

 folium Sw. from Minas Geraes, leg. Freyreiis (S), which no doubt is the same as 

 P. viviparum Raddi. 



One of the most distinct species of the whole group, easily distinguished from 

 related species by its glabrous frond, proportionally small (8—10 cm x 1—2 cm) 

 pinnæ, which are nearly entire or very shallowly serrulate or crenate, and bj' the 

 cartilagineous, often thickened margins. The short-creeping or decumbent rhizome 

 is clothed with stellato-pilose scales; rachis often gemmiferous. Pinnæ alternate, the 

 lower ones short-stalked, rounded or short-cuneate at base, not warted beneath. 

 Veins 3-6-jugate, the two lower pairs generally united, the lowermost pair, which 



