-38- 

 MARSIUACEiE. 



Marsilia macropoda Englm. In ponds in the southwest. 



Marsilia tenui folia Englm. Collected by Lindheimer on Pier- 

 devales. I have a specimen collected in western Texas by J. 

 Boll that seems to be this species. 



Marsilia uncinata A. Br. Swamps. Dallas and eastward, 

 common. 



Marsilia vcstita Hook. Swamps at Dallas. 



SALVINIACEiE. 

 Asolla Caroliniana Willd. On waters, Dallas and eastward. 



IOSETACE^. 

 Isoctcs melanopoda J. Gay. In wet sands, Dallas, rare. 



NOTES ON AMERICAN FERNS— VI.* 



By Wiujam R. Maxon. 



A Cristate Form of the Giant Chain-fern. — Not long ago 

 I received from Mr. W. G. YVatkins a specimen of Woodwardia 

 spinulosa which I suppose to be very similar to a ramose form 

 described by Mr. A. A. Eaton (Fern Bulletin, IX: 87. 1901). 

 The present specimen, collected by the sender on the banks of the 

 El Dorado canal, near Placerville. California, December 5, 1902, 

 showed the unusual feature of having the tips of all the pinnae 

 and the apex of the frond itself many times divided, the former 

 within the space of about an inch, forming divaricate crests. Mr. 

 Watkins states that plants of this sort were numerous, growing 

 in full sunlight, often to a height of more than five feet and in 

 clumps fully three feet in diameter, in a light lava soil overlying 

 an ancient river bed. The canal, it seems, was dug about forty 

 years ago for mining purposes ; the branch where the ferns grow 

 having fallen into partial disuse, a considerable amount of vege- 

 tation has sprung up along its banks. 



•Published by permission of the Secretary of the Smithsonian Institu- 

 tion. 



