Ls 
7 se ’s Nofice Pos the a ys North America. 
/ 92 Prof. B 1 
Ce a vc . a ‘Re 
Brief Notice of the Chare of North America ; by 
DT s “Prof \ Braun, icated by Dr. Encenmann. 
ond 
Ww Besipes the Equiseta, Prof. Braun has devoted much attention 
he 3 / to other families of Cryptogamous plants, such as the Rhizocars 
&¥ pee; of which he has lately published two new North American 
© species of Marsilea : viz. M. uncinata, sound 3 in 1835 by the wri- 
: ter of this note in Arkansas; and M. mucronata, discovered in 
iF 2 the year 1839 by Mr. Ceiiier, in Nicollet’s fcbiliwestern Expedi-+ 
tion, along the saline prairies near Devil’s Lake. Both are nearly 
we related to M. vestita, Hook. & Arn. of Oregon, but very differ- 
' ent from the European M. quadrifolia. But Prof. Braun’s espe- 
¥ cial favorites are the Chare, which he has very thoroughly inves- 
; tigated, and intends soon to describe monographically. As these 
¢ obscure plants are seldom collected by our botanists, he has not 
sf enjoyed so good opportunities of studying American specimens as” 
could be wished. He therefore urgently requests American bota- 
nists to aid him by the communication of their collections in this - 
geuus, (either in the way of loan or exchange,) in order that the | 
species of this country may be more satisfactorily elucidated 
The subjoined list comprises eleven North American species, 
which have fallen under his notice in various European herbaria. © 
Five of these are identical with European species; four are dis- 
tinct, but nearly related forms; while two belong to a section 
which has no known representative in Europe. GE 
Chare of North America. 
/ A. Cuare ePicynm, A, Braun. (Nitella, Agardh, partly.) 
my | 1. Cu. riexiis, Linn. (vera?)—Sterile specimens, Peonavld 
. vania? Schweinitz in herb, Zeyher. In the Meme, Massa- 
‘4 _chusetts, Greene. : 
| jf ee 9 2. Cu. cromerutirotia, A. Braun.—(Subspecies of C. cat : 
f 4 | we In the Merrimac, Greene. # 
3. Cu. mucronata, A. Braun.—(C. flerilis of authors, partly) 
var. Americana? A. Braun. In the Merrimac, Gireene. 
-“} * Dr. Engelmann of 
i. wo is, and also Prof. f Harvard Noi 8 v 
lly take charge of parce essed to Prof. Braun 
| or communicatio 
Ga Ng 
oe ae 
