﻿34 



THE FERN BULLETIN 



were probably Clintonianum X marginale, and laid 

 several aside for further study. 



In 1908 I again searched the swamp collecting all 

 the odd forms of Nephrodium and making a careful 

 study of them. I now found several plants of N- crista- 

 tum X marginale, and one very striking form with the 

 proportions of a small cristatum, the cutting of Boot- 

 tii, and the texture and smooth light colored indusia 

 of spinulosum. This I sooon identified as N. crista- 

 tum X spinulosum. 



Among the plants were thirty-five or forty of a form 

 quite common and classed doubtfully as "Clintonian- 

 um-Boottii." It had the form and general aspect of 

 Clintonianum, but the cutting of Boottii. Later a 

 close examination showed that, while some of those 

 were characterized by a glandular indusium like of 

 Bootii, most of them were entirely smooth. This sug- 

 gested that they were N. Clintonianum X spinulosum 

 and N. Clintonianum X intermedium. I had read Mr. 

 Philip Dowell's article on hybrid ferns in the Torrey 

 Bulletin for March, 1908, but did not have it with me in 

 Vermont. On returning to New York State I imme- 

 diately looked it up, and got into correspondence with 

 Mr. Dowell, and sent him some of my collection. He 

 confirmed most of my identifications and pronounced 

 that doubtful hybrid, collected in 1905, Clintonianum 

 X marginale. 



As N. Goldiauum was not found in this swamp, the 

 possible hybrids in this group number ten in place of 

 the fifteen suggested by Miss Slosson in the Bulletin of 

 October 1908. If you allow some rather questionable 

 forms to be named N. Clintonianum X cristatum, and 

 some intermedium X spinulosum about which I am 

 fairly confident, nine of the ten were taken from an 



