distance often shows deceiving similaritsr in exterior habitat witHr 

 £. lophothele» ; and , which I assumed then to be all relatives of one 

 species, . . Here in Berlin, , these mamnilariae were not being considered 

 as varieties of one species f ,and I decided to describe the t^ree most 

 diverting forras under the names M. pachythele ; M. erinacea and M. nela » 

 rocentra . (The narae M# pachythele was very poorly selected; because». 

 though ..this variety did indeed have very thick mammae (the Ge^.an 

 word is verbat im "warts". E.D. ) , there existed already another M. 

 pachythele , described by Salm« ) . . I also described a very striking va- 

 riety of ^ophotheke , , smaller in body and almost entirely without 

 spines under the name E. Rinconersis . This too has become by now ex- 

 tremely rare and I myself do not possess any nore». 



M; chlorosti^ma Here too I cannot say with absolute certainty if 

 it is not identical with M. Pottsii , as I do not have anything any 

 more o^ this and most o^ the other plant s, which I collected then,. 

 Your description fits however alnost connletely with the plant" as I 

 have it in ny memoryv only the length of 10 cm seems to ne too high; 

 I would guess a maximum of 7 cm». You yourself say, that with a diame- 

 ter of 2| to 3 cm the flowers have a length of 2 cn. This one I 

 called relatively large. 



M . c o r n i f e r a Wi t h everything you say about this pne I agree. My 

 E* (S) Salinensis is nost likely nothing further, than a variety of 

 co^nlfera , though most striking. . It is nost like IU Echinus ;Eng.... 

 Böss^ws^^to shaped and strikingly elonrated and narrowed teats.. 



M.robusti spina The plant s you send, may surely be my Ech (M) 

 Sattillensi s ; however I consider the 1-1, . robusti sr>ina as diverting,. 

 prlmarly because it srrows in Sonora and. the distributiorr spread r could 

 hardly reach to Saltillo» . E. . Posel.gerianus is in its entire habitat 

 very diverting but does not exist live a^y nore.. H. ScheeriT is ce^tain- 

 ly quite close,but is very rare,an^ unknown here in Berlin.. 



