To whom letter is written is not indicated in the original. 



Upsala, Sweden March 22, 1 833 

 Very Honorable Sir, 



Please excuse me for not having answered your friendly letter a long time ago. I have 

 been very busy in the recent past, and I could not find any time to answer your letter. 



I examined the Algae that you sent. It is definitely very close to my M. leptodernum. It 

 is quite close but I do not dare say that it is identical. It is different because it has a 

 thicker cell wall and has a different form. I think your plant is closely related to a M. 

 leptodernum. I would say, as you can see from my description, that the similarities are 

 only fragmentary. According to this it is similar in its historical development to the M. 

 fuseum, whereas your plant is mostly similar to the M. greviller and others. I will be 

 glad to send you a collection of arctic and northern Algae at the end of the year, 

 together with my " Flora of the Arctic Ocean". 



With highest esteem and devotion, 



T.R. Tylmann 



Translation German Manfred Thurmann 



