542 EDWARD TDCKERMAN. 



region, from Texas, the Pacific Coast, the Sandwich Islands, and es- 

 pecially from the rich materials gathered in Cuba and elsewhere by 

 the late Charles Wright. In these years, too, he much helped the study 

 of his favorite plants by the preparation and issue of his " Lichenes 

 American Septeritrionalis Exsiccati," in six fasciculi, or three volumes, 

 highly valued by those who fortunately possess them. Equally for- 

 tunate are the herbaria which possess the " Caroli Wrightii Lichenes 

 CubiB Durante E. Tuckerman," which authenticate his thorough work 

 upon that portion of Mr, Wright's Cuban collections that he undertook 

 to elaborate. 



Passing without notice various subsidiary contributions both to jour- 

 nals and to the Reports of Exploring Expeditions, (which, however, are 

 all enumerated in the appended list,) we come to a pamphlet which he 

 independently published at Amherst, in 1866, entitled " Lichens of 

 California, Oregon, and the Rocky Mountains, so far as yet known," 

 which, small though it be (pp, 35, 8vo), is particularly noteworthy. 

 For in this he lays down the principles and matured opinions which 

 he had adopted, and which he firmly adhered to, for the taxonomy 

 and classification of Lichens, Those are fully exemplified in the two 

 systematic works to which Professor Tuckerman's later years and 

 maturest powers were persistently devoted, — works which, partly 

 from their publication somewhat out of the ordinary channels, are by 

 no means so well known as they should be, but which surely secure to 

 their author the position of a master in his department, — in which, 

 indeed, we suppose he has left behind him no superior. These works 

 are, first, the '• Genera Lichenum, an Arrangement of the North Ameri- 

 can Lichens," (pp. 283, 8vo,) published at Amherst in the year 1872; 

 second, the " Synopsis of the North American Lichens," Part I., com- 

 prising the Parmellacei, Cladoniei, and Ccenogoniei, published in Boston 

 (by Cassino & Co.) in 1882, It is hoped, but it is not yet certain, 

 that some portions of the remainder, relating to the less conspicuous 

 but more difficult tribes, may have been substantially made ready for 

 the printer. The loss, we fear, is irreparable ; for the work cannot 

 be completed by other hands upon quite the same lines, nor in our 

 day with the same knowledge and insight ; and Professor Tuckerman's 

 mode of exposition is inimitable. 



That which Professor Tuckerman did accomplish, however, suffices 

 to show the wide reach and remarkable precisiou of his knowledge, 

 his patience and thoroughness in investigation, his sagacity in detect- 

 ing affinities, and liis philosophical and rather peculiar turn of mind. 

 He wrote in a style which — though perhaps founded on that of his 



