- ■ 2 - Dr. E. Purkynje Feb. 6 , 18?5 



and to writename, species, place of origine and collector.. My method of' 

 examination, which has been introduced a long time for the cryptoganrs», 

 satisfies me completely* The dif f erences of good species are so sharp,, 

 transitions occur never,and the lärmest habitat' (the German word is 

 "habituell*, E.B. ) differences< disappear completely und er the micros- 

 cope.that even with the smallest framnent of a needle one is always 

 quite sure,what one has in front of oneself. Equallyv,the classif icatioro 

 of the tribes' is seif- evidente and there is never any doubt, if a form? 1 

 should be a true species^ or as a varietyvand of which kind, or only/ a^ 

 local formr* which internally does not diverge from another species,. 

 Thus are the f orms t preated byy Willkomms of Pinus Mughus- . . pumilis- fronr 

 thte alpha uncinata (üliginosa) Un no way different from each otheir,, 

 but the Spani sh 1, uncinata diverge s however constantly^ thoughr in a 

 small way,. Pinus Friesiana Wichura from Lapplandr; pontica C. Koch are 

 in no way internally different from- s il ve s t r i s . regardl e s s how Älfferent 

 they may look* P. Larkio ( ? E.D.) from western Europe differs from the 

 east-europaean and orientall constantly though not importantly; and this 

 difference is not to be explained climaticallyybecause the west-euro- 

 paean form occurs in the orient with the eastern, where it was descri- 

 bed as its own species as Pinus Fenzlli ; In contrast, P. Cembra var.. 

 Pygmaea from Amur is a true species^closely tied too parvlf olla . whichn 

 belongs to the Strobus group -and not to Cembra » . P». Gerandiana and 



identical with i tt ■ Bungeana^ , — Spctct — -despite their 



3 needles In the leaf -sheaths and the other structure of the needles,, 

 show an exact relationship to the pines of di Vision? Cembra and NOTT 

 with longif olia , canariensis , taeda, , australis , etc.. Of the Mexicans 1 

 the^e are certainlyvmany different species^ only, I could not deter - 

 mine those, which I T received'" under the names patula and leiophyllä ». 

 collected byvHeller. The Heller specimens, which I saw t are not authen- 

 tic specimens of patula and leiophylla. I have also seen quite curious 





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