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Eudryopleris is nol nearly related to the other subgenera of Dryopteris. In the 
lack of simple hairs and in the structure of the scales it agrees with Sligmatopteris, 
but the venation and indusia are very different. Most species of Eudryopleris have 
large, persistent, reniform, often glandulose indusia, while Stigmatopteris includes a 
larger number of exindusiate species and some few species having large, circular, 
peltate indusia. Some species of Eudryopteris resemble closely certain species of 
Ctenitis, but they differ always by venation and lack of articulated, reddish hairs 
on the coste above. 
Eudryopteris includes, as delimited here, the genus Dichasium of A. BRAUN and 
Fée and at least partly Hypodematium Kunze. Most of the species are large, with 
a bipinnatifid-decompound, lanceolate or deltoid lamina. In D. Saffordii the lamina 
is narrowed downwards about as in a species of § Lastrea. Commonly the leaf 
is fresh-green above and pale beneath, thick of texture and not rarely coriaceous; 
still thinly herbaceous forms are also to be found, f. inst. some of the Cystopfteris- 
like small Mexican forms. 
Key. 
1. Lamina bipinnatifid; segments entire or toothed. 
2. Small. Lamina deltoid, thin. Indusium grey. 4. D. mexicana (Pr.) C. Chr. 
2. Larger. Lamina lanceolate. 
3. Lamina coriaceous, glandular throughout. 
1. D. Saffordii, C. Chr. 
3. Lamina membranous-chartaceous, eglandulose. 
4. Segments rectangular with parallel, entire edges and truncate 
toothed apex, the upper basal one rarely enlarged and free. 
Rachis densely chaffy by long glossy scales. 
3. D. paleacea (Sw.) C. Chr. 
4. Segments attenuate, toothed throughout, the upper basal one 
generally enlarged and free. Rachis less scaly. 
2. D. filix mas (L.) Schott. 
1. Lamina bipinnate-quadripinnatifid. 
2. Indusium flat or absent. 
3. Small species; lamina 10—30 cm. long, pinnae rarely more than 
8 cm. long often 3—5 cm. only. Both surfaces more or less 
glandular. 
4. Lamina deltoid or ovate-deltoid (the basal pinnz not con- 
spicuously shorter). 
5. Indusium large, reniform, grey. Surfaces finely glandulose. 
Most upper pinne decurrent; secondary segments or pin- 
nules broad, ovate or oblong, subentire or toothed, the teeth 
closemuatbieutobtuser c-r 4. D. mexicana (Pr.) C. Chr. 
5. Indusium small, brown or absent. Both surfaces densely 
glandulose. Pinnz not decurrent; secondary segments or 
pinnules narrow, linear, sharply and remotely toothed. 
5. D. glandulifera (Liebm.) C. Chr. 
