v. 
DESMIDS OF THE UNITED STATES. 279 
By W. West, F.1.S., and G. S. West, A.R.C.S. 
[Read 2nd December, 1897.] 
(Prates 16-18.) 
A VERY promising worker at North-American Desmidiex, Mr. L. 
N. Johnson, of Ann Arbor University, Mich., whose early 
decease is much to be regretted, left some valuable notes 
and drawings. These came into the hands of Prof. W. G. 
Farlow, of Cambridge, Mass., by whom they were sent to 
Dr. Nordstedt, of Lund, Sweden, to examine, and with a request 
that anything coutained therein worthy of mention should be 
published. Dr. Nordstedt, who was much occupied, wrote and 
asked if we would undertake the matter, as we bad lately been 
working at American Desmids. We assented to his request as 
Mr. Johnson had been a much-valued correspondent of ours ; 
and the following paper is the result of a careful consideration 
of his notes and drawings, the examination of some material 
received from him about a year ago, together with many obser- 
vations on collections of Desmids from the United States in our 
possession, 
Johnson’s notes and drawings, made during his examination 
of a large number of gatherings of Desmids from all parts of the 
United States, add much to our knowledge of their distribution. 
In the course of his work he published three papers * in which 
he recorded many important observations on the less-known 
American Desmids, and described and figured several new 
species ; and we now find other well-marked new species among 
his recent drawings. This work clearly testifies that he was 
facile princeps among the American workers at this class of 
Pants. He also left an herbarium of microscopical prepa- 
rations, to which reference has been given under the majority of 
the species in this paper (e. g. H. J. no. 535) ; and as he con- 
Unually refers to it in his notes, we think it must be a valuable 
one, though in whose possession it is we do not know. 
Pani figures are from drawings by Johnson, except the 
Wing :—Pl. 16. figs. 10-13; Pl. 17. fig. 16; PI. 18. figs. 1, 
4, 8,10, and 15 ; figs. xylogr. 1, 3, 5 a-c, 6 c, and T. 
On some Desmids of the United States. 
* u . 
"i On some species of Micrasterias,” Botan. Gazette, vol. xix. (1894). 
» me new and rare Desmids of the United States, I.,” Bull. Torr. Bot. Club, 
rm No. 7 (1894) ; IL, vol. xxii. No. 7 (1895). 
