Eaton : Pteridophytes observed in Florida 471 



gradually sweeping upward to the margin. They are very 

 regularly placed and parallel, and very distinct on both surfaces 

 because of their stramineous color. They are flat on the upper 

 and somewhat prominent on the lower surface. The cross-vein- 



* 



lets are also regularly placed and parallel. The lowermost starts 

 at or near the axil of the vein, runs obliquely upward to a little 

 above the middle of the space, then turns abruptly down to the 

 base of the vein above, describing a broad inverted V. Other 

 veinlets follow in regular succession at a distance of about a mil- 

 limeter. At the outer angle of the V there is a free clavate vein 

 reaching nearly to the inner angle of the next above. The sori 

 are naked, and are formed along both sides of the V-shaped veins, 

 beginning at the angle in less fruited specimens. Usually the sori 

 are confluent in the later stages, covering the whole back of the 

 pinna, even to the apex, with cinnamon-brown spore-cases, divided 

 into parallel bands by the stramineous veins. 



The species appears to be quite variable, and is found through- 

 out the West Indies and Mexico to Brazil, and finds a counterpart 



r/ 



Adiantum tenerum Sw. 



This beautiful fern was abundant in the hammocks of the pine 

 woods, growing mostly in and around lime-sinks, in rich leaf- 

 mould. Most of the plants were in full vigor, although a few had 

 lost their pinnae. In Timb's hammock a clearing had been made, 

 the trees being simply felled and allowed to decay. Here the 

 ground was completely covered in places with tangles of this fern, 

 the sinks being lined with the young plants. At this place I found 

 a clump of plants, all sterile, that strongly resembled A. Farley ruse, 

 the pinnae being large, sometimes 3 cm. long and broad, cuneate 

 at the base, very deeply cleft, the lobes mostly rounded. The 

 species was found only in limestone hammocks and is apparently 

 absent from the lower counties of the west coast. 



Pteris aquilina pseudocaudata Clute 



Apparently absent from the rocky woods of South Florida, but 

 abundant about Oviedo and Sanford in central Florida and about 

 Fort Myers on the west coast. Confined to dry sandy regions, 

 so far as observed. 



