POLYPODIES. 



larger, with the segments articulated. Rhizome creeping. A 

 very distinct group as to external characters, essentially differing 

 from all the preceding genera in the production of small sterile 

 oak -leaf-like fronds. The segments or pinnae of the normal or fer- 

 tile fronds are articulated, and readily fall away. In D. coronans, 

 the sori, which form a single oblique series between the pinnate 

 veins, are sometimes here and there confluent, and occasionally 

 almost continuous across the segments by the confluence of the 

 receptacles, though normally polypodioid. In these instances, 

 the structure of the (confluent) abnormal sori, is analogous to 

 what occurs normally in Selliguea. 



Ex. : D. quercifolia, J. Sm. \ D. Wffldenovii (Polypodium, Eory.J 



D. morbillosa, J. Sm. \ D. diversifolia, J. Sm. 



110. AG-LAOMORPHA, Schott, Gen. Fil. t. 19, (fasc. 



iv. t. 4.) 



PSYGHIUM, Presl ; DETKABI^ sp., Gaudiehaud; POLTPODII sp., Qold- 

 mann. 



Sori non-indusiate, rotundate, solitary in the contracted lobe- 

 like segments of the fertile upper pinnae ; the receptacles large 

 hemispherical, situated usually at the point of confluence of two or 

 more venules. Veins (sterile) pinnate, prominent, from a central 

 costa, the venules transversely anastomosing forming ultimate 

 sub-equal quadrangular areoles, from the sides of which proceed 

 divergent free veinlets ; or, (fertile) nearly obsolete, confluent. 



Fronds coriaceous, dimorphous, the sterile sessile querciform, 

 brown, rigid ; the fertile also sessile, rigid, pinnatifid and sterile 

 below, pinnate contracted and fertile above ; the pinnae articu- 

 lated. Rhizome creeping, tufted, epiphytal. Allied in its sessile 

 fronds to the true Drynarias, but differing in the contracted 

 nature and obsolete venation of the fertile upper pinnae. 



Ex. : A. Meyeniana, Schott. 



111. DIPTEBIS, Reinwardt, Regensl. Sot. Zeit. ii. 3. 

 POLTPODII sp., Auct. ; DBYNABI^E sp., J. Smith. 



Sori non-indusiate, small, round, superficial ; the receptacles 

 punctiform : (1) transversely sub- serial between the branches of 



