Hegelmaier Mky 15tl865 7 



all the way to the beautifuHright-angled latticeworkk of the C"»Mullerl. 



The latter is the most exquisite Call i tri che known to me.. - What con- 



cerns the star-hairs, I have exarained that point anew,made aware of 

 Star- 



it by your note; hatfs are found on C» marginata ,, ^ejf lexa,,peploides 

 (how Cuba) ; the other species I have not yet examined for this point.. 

 Transitions between my 2 motives I do not know.. I remember, having heard 

 A. Braun make the statement f that perhaps of his 3 groups of Isoetes,, 

 more correctly, 2 could come closer together.. As he thinks now about 

 this point, I do not know.. 



All in all one may say, that species dif f erentiatiorr in Calli- 

 triche is in part difficult* but that is no reasorr, to not fix the 

 the striking types as species. Because even good species could (( and 

 should) pass into others,.not stand next to each other without con - 

 nection. For that reason, he whoc separated and he who connects f raay inr 

 certain cases ? in reality both be right.. 



M-yyreal study for now and the near time are the Leranaceae.. Here 

 the species difference is simple and easy. The difficulties ife on other 

 Problems^ which are not minor. I know from Nörthamerica L. m\W r, *tf » S«U<X , 



^dyty\X,(K i^Z — Y***? ~ % L.gibba seems to be raissing there.Equ - 



ally I do not know of any Wolf f ia there.. L. umbracta A.Br. is L. poly- 

 rrhlza. I have already looked at much and valuable raateriall, and, in 

 part f own it.. But the study of the history of development, will' probab- 

 ly take much time.. 



I have not yet published anything about Callitriche, and T 

 also did not receive the di ssertatiorr about anerican species, kindly 

 promised by you, nor seen. When I will be able to to assemble my collec- 

 ted material, I do not know at this moment. . ThÄugh I ! repeat the above 

 promises concerning calli trichological aquisitions.I commend myself 

 to you for any possible f utureoccasions for shipments to Europe of 

 american- Callitriche, of which I possess nothing except what came to 



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