62 J. SMITH ON THE GENERA OF FEIINS. 



22. Dryostachiuim, J. Sm, 



Veins (of sterile segments) costaeform ; venules compound, 

 anastomosing, forming nearly equal quadrangular areoles, 

 and producing from their sides variously directed free vein- 

 lets, fertile segments terminal, contracted, entire, plain, spo- 

 rangiferous ; veinlets confluent, forming a large oblong or 

 quadrangular sorus between each two of the nearly obsolete 

 costseform veins, arranged in a transverse row, nearly con- 

 fluent. Fronds sessile, rigid, one to three feet long, simple, 

 or usually pinnatijid and sterile below, and pinnate and fertile 

 above, the pinncB sessile and articulated with the rachis, 6 — 10 

 inches long, tesselated, the areas of which are wholly occupied 

 by the sporangia, tvhich are smooth or pilose. 



Species. 1. D. caudatum ; (Polypodium, Reinw.) 2. D. 

 splendens ; J. Sm. — Journ. of Bot. p. 399. 3. D. pilosum ; 

 J. Sm. loc. cit. — Illust. Hook, gen.fl. ined. 



Obs. The first mentioned species of this genus is a native 

 of the Celebes, and the other two are from the island of 

 Luzon, growing on trees, agreeing in habit with Drynaria 

 quercifolia and D. coronans, but differing by the fertile por- 

 tion of their fronds being contracted into rachiform segments 

 bearing remarkably large sori, which two characters must be 

 viewed as the only technical distinction between Dryosta- 

 chium and Drynaria. 



23. Aglaomorpha. Schott. 



(Psygmium. Presl.) 

 Veins (of sterile segments) costseform ; venules compound, 

 anastomosing, forming nearly equal quadrangular areoles, 

 and producing from their sides variously directed free vein- 

 lets, fertile segments terminal, contracted, sinuously-pinna- 

 tifid ; sporangiferous veinlets confluent, obsolete, forming a 

 round, small, depressed sorus on each lobule of the segments, 

 arranged in a transverse row. — Fronds sessile, rigid, two to 

 three feet long, pinnatijid and sterile below, and pinnate and 

 fertile above, the pinn<e sessile and articulated with the rachifh 



