Leipzig, Braustrasse 6b 

 May 7, 1882 



Ssteemed Professor] 



As I read today in local magazines the notice of your newest treatise 

 "The genus Isoetes in North America 1 ' I am finally carrying out the resolve 

 to ask for your assistance in my studies about vascular cryptogams. I do 

 posess a not unimportant collect ion of Pteridophytes , some Croups particularly 

 interesting to me are still not well represented and North America in creneral 

 is quite poorly represented, while I posess much from South America. Especially 

 this also does not give anything eise of Isoetes , of which I have from North 

 America only sparse specimens of L Malavopoda and I. flaccida for studying, 

 nothing eise. If you can help me to obtain more and complete material, I 

 will ask you sincerely for it, and from "Surope I will be glad to send you what- 

 ever I ean procure, if you will make your wishes known to me. Also other 

 Pteridophytes will be very welcome, namely Ophioglossaceae , Hymenophyllaceae , 

 Selaginella , and Lycopodiaceae . Then, even though I in first line have the 

 fern-flora of New Holland, Polynesia, and the Indian Monsoon area in mind, I am 

 not indifferent to the rest of the world. 



At the same time I am sendinr as printed matter several works. I would be 

 glad to send you everything, but I no longer have most of the essays, however 

 from now on I will have you in mind, if it interests you, to receive tbe pre- 

 cursors of a comprehensive work about the above designated field. 



In repeating my renuest, I am sincerely, Your devoted 



Chr, Luerssen 



Prozessor of Botany, *nd cur*tor of the University Herbarium. 



7 8 9 

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10 Missouri 



