Frasmentary letter by Dr. Geore Engelmann.No Date. No Address. 
Dr. J. Gibbons Hunt in Philadelphia has a farm not far from the 
city of Darby (a little village ?),where Isoetes grows. He writes: 
ee in English,E.D.) 
— "The plants grow in small ditches not in the vicinity of tide 
water and not in a rapid current. Its base is submerged, but the 16h. 
ves extend above water. If these ditches partially Ale uns they do 
in Summer,the leaves fall over,but they are not procumbent.There is 
no recession of the water in the spots in which it grows. I have seen 
the leaves about 18 inches in length (remark in German,E.D. in the 
only one sent which was half rotten they were 1% inches long) and ri- 
sing from the surface of the water. The soil is not of much Iinportance; 
the plant will thrive as vigorously ın sand as in clay." 
I mail you several frasments of the half-rotten plant and dra- 
winges. 
It is apparently entirely the same as the one Sent from Wil - 
mington 4 weeks ago,which I considered a large riparia,and is Engeel- 
gwanni,having again compared it with my oririnal specimens. I also en- 
close a black fragment;- I never before have seen one black and PDOssess 
only this one specimen,which had been collected in 1842 with the white 
ones,.- 
I send here the second Isoetes riparia from Wilmineton,which shows 
distinctly the same metamorphosis of the bulbus,as Hall had determined 
first for melanopoda. Those sent 14 days earlier do not show anything 
of dying-off of the tuber-parts from the previous year - here however 
x P 
it is obvious; they all dpe off in June and have disappeared in July. 
Plants collected in Fall! 
A I 
M OURI 
Ö 1. 2 3 4 5:6 L ö 9 10  OTANicht 
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