13 65 



Eudryopteris is not nearly related to the other subgenera of Dryopleris. In the 

 lack of simple hairs and in the structure of the scales it agrees with Stigmatopteris, 

 but the venation and indusia are very different. Most species of Eudryopteris 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 costæ 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 ij 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 Cystopteris- 

 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 

 generallv enlarged and free. Rachis less scalv. 



2. D. filix mas (L.) Schott. 

 L Lamina bipinnate-quadripinnatifid. 



2. Indusium flat or absent. 



3. Small species; lamina 10 — 30 cm. long, pinnæ 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 pinnæ not con- 

 spicuously shorter). 



5. Indusium large, reniform, grey. Surfaces finely glandulose. 

 Most upper pinnæ decurrent; secondary segments or pin- 

 nules broad, ovate or oblong, subentire or toothed, the teeth 



close, rather obtuse 4. D. mexicana (Pr.) C. Chr. 



5. Indusium small, brown or absent. Both surfaces densely 

 glandulose. Pinnæ not decurrent; secondary segments or 

 pinnules narrow, linear, sharply and remotely toothed. 



5. D. glandulifera (Liebm.) C. Chr. 



