-> 2 _- 
then muricata and Enselmanni together as both are erowine there, 
and Braunii. By now you must have received muricata_ in live form. 
I have again examined the plants from Bethlehem, and find, that 1 
may have done wrong to Durant recently, as I assımed, that 2 spe - 
cies had been thrown together. Those are small specimens of Engel - 
manri. L. riparı has not been found anyplace else than between 
Philadelphia and Wilmingston,where the tides create a strange amphibi- 
changing 
an ecosystenm|between hiceh and low watermarks twice a day in sweet 
water. I saccharata does likewise. !! 
I did answer Derby ? and Hunt ? (the question marks are in the 
oririnal, E.D.). You ask for young specimens of Isoetes Engelmanni. 
An (FD 
T enclose the youngest ones. Nb. Metternix sart, CordaR picture 
Isoetes germinating as if both roots and stem were braking throuesh 
the spyore covering; That is certainly not so with Engelmanni; the 
spore is at first sideways of the stem support or first leaf, and 
then the rootleaves are two-lined.! 
I wrote to you about Lake Iamona. By-the-way, did you examine 
the plant of Chakan ? I hope to obtain another specimen and you must 
keep this one; According to my notes it can-aaLF7 be flaccida but 
is probably Engelmanni; but I noted the microspores as spiny, while 
those of Engelmanni are smooth; 
Durien saw Isoetes of Nuttall from Columbia under the Nane 
opaca in the Philadelphia herbarium, and praises, that Nuttall recog- 
nized a new species already 30 years ago,whilst everything depended 
Cernıtt$ (RED) 
% 
on the one I. serasius. This would be all risht, if Nuttall had ex- 
amined it, thoush it is knom that he operated quite arbitrarly 
in old age and saw new species everymwhere, often just on the base of 
a new locality. By-the way, Durien writes to Durant (who told me 
about the letter) that the plant is without spores. Do your plants 
have spores, so that they can be identified ?° I studied the califor- 
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