Vll 



ent, who was so entirely our wise leader and teacher, that we ever 

 refused to think of that time when he might be called away from 

 us. The imiiortauce biological studies now hold in American 

 schools and colleges and in an enlightened public esteem, and the 

 value therefrom which results to every commonwealth, is due 

 more than to any other to Dr. Asa Gray. 



"All hearts grew warmer in the presence 

 Of him who, seeking not his own, 

 Gave freely,— for the love of giving, 

 Nor reaped for self the harvest sown." 



May the memory of his simple, unaffected life, full of wisdom 

 and the desire to be helpful, linger long with us and strengthen 

 us, according to our degree, to similar loving acts of help ! 



We have to thank for assistance in special departments Mr. 

 William Boott, for kind aid in the nomenclature of the genus 

 Carex ; Dr. George Thurber and Dr. George Vasey for similar aid 

 in Gramineoi ; Mr. Willey, of New Bedford, for revision of the 

 Lichenes ; Dr. W. G. Farlow, of Cambridge, and Prof. D. C. Eaton, 

 of New Haven, for many additions to the list of Marine Algoe ; 

 Mr. C. H. Peck, of Albany, N. Y., and Mr. J. B. Ellis, of Newfield, 

 N. J., for revision of the Fungi; Mr. L. Lesqereux, for the nam- 

 ing and verification of many species of Musci ; Rev. Francis Wolle, 

 for information regarding FreaJi Water Algce ; Mr. Lathrop, for 

 contribution of Desmidiaceoe, &c. ; and other friends whose con- 

 tributions are noted in the text. Thanks are due to the Botanical 

 Committee of the Franklin Society, for their patience and consid- 

 eration in the extremely vexatious delays which have occurred, 

 and especially for the liberal manner in which they have provided 

 for the publication of these pages. 



Gray's Manual — 5th edition, 1867 — has been followed in the 

 arrangement and nomenclature of the Flowering Plants and Ferns, 



