X. PREFACE. 



extensive and accurate ; Mrs. Maria H. Bray, oi 

 Magnolia, and Mrs. Abbie L. Davis, of Gloncester, 

 who have long been known as careful students and 

 industrious collectors about the rocky and fertile 

 shores of Cape Ann; and Miss M. A. Booth, of Long 

 Meadow, who has spent several summers of profit- 

 able collecting on the east end of Long Island, have 

 each kindly made out for me lists of the plants 

 which they have collected in their several localities, 

 together with notes of their special habitat, season of 

 growth, and frequency of appearance. 



Dr. C. L. Anderson, of Santa Cruz, Cal., Dr. N. 

 L. Dimmick and Mrs. R. F. Bingham, of Santa Barbara, 

 and Mr. Daniel Cleveland, of San Diego, ail well- 

 known collectors and Algologists, have very obligingly 

 dene the same thing for the plants of their several 

 localities on the Pacific coast. In addition to that, 

 they have sent, me many valuable typical specimens 

 from the rich and extremely interesting flora of that 

 region. 



Nor can I forget the generous assistance which 

 for years past I have received from that veteran col- 

 lector in New York waters, Mr. A. R. Young, of 



