Hegelmai er 



Nov. 12, 186? 



not find «in my examinations so far, which, of course were limi- 

 ted in quantity.. When pigmeJitation is quite dilute.it most likely 

 disappears entirely through drying ( or bei ng in spirits) \ whereas 

 with stronger intensityvmore often it is^not being altered throughr 

 these influences. This I suppose accordincr to the analogue condition 

 of the pigmentationr on your Lemnaceae ( gi bba , pol yrrhi za } Di d you exa- 

 mine the brasiliensis freshP,and is the pigment of the fresh plant 

 also already brown ?? but not perhaps purple T% It would be of highest 

 value to ge"t inforraation about this point.. Weddeln, according to his 

 report,, examined only dried and many soaked specimens,and found the 

 mass of them brown. Still another point^s Our arrhlza ,has an Upper 

 surface, which is not leveli,but strongly dornet in cross-directioir* 

 (a to b),but only in this one.so that a crosscut along this line is 

 edged almost by a circular line. With the best 

 soaked specimens of W. brasiliensis it seems to me, that 

 the upper surface is really flat,however in this I 1 

 could fool myself easily by the nature of the sub- 

 ject; may-be, you could give Information about this, in case you 

 have examined live plant s.. 



The plant s in spirits (or, should this be Spiritus ? E.D. ),, of 

 which- you wrote, have not yet arrived. I do not believe, that they 

 have been lost, but that they are being transported slowly.. 



Lately, I examined muchP exotic material, in part for the se- 

 cond time, and became much inclined, to describe the Lemna perpusilla 

 pauciCostata i as a specific sr>ecies. . I expect already now, thowdt I 

 have not yet examined several lar^er herbaria, to come to the opinion,. 

 to be able, to prove a much wider geographica! distribution for the 

 plant ( ' also in Asia and Africa) ) within which" is varies only in in- 

 significant points in some dimensional conditions, with out having^ 

 seen up to now true connecting links with perpusilla (multirostata) » 



