Eaton: Pteridophytes observed in Florida 483 



Odontosoria J. Smith 



General habit of Davallia and sometimes considered as a section 

 of that genus (§ Stenoloma Fee ; Cuneatae Hook.). 



Fronds mostly decompound, the ultimate segments narrow, 

 cuneate, glabrous, with the sori sunk in a transverse pocket at the 

 apex, much like the genus Lindsay a. 



Odontosoria clavata (Sw.) J. Smith 



Rootstocks short, creeping, densely clothed with jointed fili- 

 form, glossy, dark-brown hair-like scales ; stipes contiguous, 

 stramineous, naked except for a few scales at the base, 3-25 cm. 

 long, obtusely triangular; fronds 1-3 dm. long, 5-18 cm. wide, 

 ovate to lanceolate, dichotomously tri-quadripinnate, the ulti- 

 mate segments often cleft or divided ; rachis stramineous, deeply 

 grooved above ; pinnae long-stalked ; ultimate rachises green, cen- 

 trally grooved ; segments linear to cuneate, entire on sides, finely 



toothed at apex, about 1 cm. long and 1-2 mm. wide, with I or 



2 usually dichotomously forked veins with thickened and conflu- 

 ent ends ; sori sunk in the ends of the segments, confluent on a 

 transverse vein that connects the tips of the primary veins. 



On the edges of small lime-sinks which usually contain water, 

 in pine woods ; first observed by Mr. Simpson near Camp Jackson. 

 Found later by Mr. Soar and myself in sinks between Costello's 

 and Ross's hammocks, and later by me in an old well at Buena 

 Vista. It is a very pretty fern, lining the sides of the sinks, 

 thriving best where shaded from the direct sunlight. It is found 

 only in those sinks that are in the comparatively strong light of 

 the pine woods. Its yellowish-green, finely cut, close-set fronds 

 hanging gracefully over the rugged rocks form a very pleasin 

 sight. It is found in most of the West Indies, including the 

 Bahamas, and it is not surprising that it should be found in the 

 lime-rock regions of South Florida. 





Nephrolepis biserrata Schott 



Abundant in swampy hammocks back of Miami and in similar 

 situations southward, often on palmettos. In Costello's hammock 

 is an opening overrun by this fern, through which it is impossible 

 for one to force his way, except by bending the plants down and 



