254 202 
^ 954. Dryopteris Schaffneri (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! 
Aspidium imbricatum Fourn. Mex. pl. 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 pinne and a similar terminal one. Pinne 15—25 cm long, 
3—4cm broad, stalked, incised about halfway to the midrib into falcate, acute or 
obtuse segments. Pubescence variable; some specimens are practically quite glabrous 
(= var. glabrescens Fourn. 1. c.); others have long, whitish, patent hairs on coste 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 pinnz 
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. Schaffneri 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, VrgLET nr. 82 (B, Herb. Mus. Paris) — Misantla, L. Haun nr. 623 (B, Herb. 
Mus. Paris) — Córdoba, KEnBER nr. 86 a (B) — Mirador, ScHAFFNER, MULLER, SAnTORIUS (B) — 
Vicinity of Gómez, Farias, Tamaulipas, Epw. PALMER nr. 298 (W). 
255. Dryopteris vivipara (Raddi) C. Chr. Index 300. 1905 — Fig. 43 c. 
Syn. Polypodium viviparum Raddi, Pl. 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. FREvREnS (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 »« 1—2 cm) 
pinne, which are nearly entire or very shallowly serrulate or crenate, and by the 
cartilagineous, often thickened margins. The short-creeping or decumbent rhizome 
is clothed with stellato-pilose scales; rachis often gemmiferous. Pinnz 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 
