Dr. E. Purkinje 



Weisswasser, April 25, 1880 



Dear Sir: 



I thank you very much for the revision of the Pinus , which I received today, after 

 the card reached me yesterday. Above all please send me once more the needles of P. 

 muricata Monterey dried - Hill Bolander I865, then of Banksiana Spokane Valley Lyall 

 1861, P. Inops Maryland G. Engelmann I85O and P. contorta (Murrayana) Jeffnery No. 7kö 

 Calif. lat. 43, 7300» 1852. 



The first 3 became somewhat macerated when soaking and gave no adhering sections, 

 the c ont or ta ( Murrayana ) had a split needle and gives good but only half sections, 

 which however can do in emergency. The special examination of the individual habitats 

 shows much that is new; so contorta from Colorado deviates somewhat, contorta from the 

 Cascade Mountains Lyall because of lack of resin ducts, is close to Bolanderi, Inops 

 Delaware Camby I863 appears to be mitis , which in the meantime I will have to examine 

 more closely. Mitis and glabra are very sharply separated, however I must compare them 

 more closely with Taeda rigida ;, serotina , which I have examined less up to now. The 

 assertion that pungens has vascular bundles, resin ducts rests on examination of a 

 falsely designated specimen from Boissier Herbarium, not upon mistaking the one sent 

 by you with Elliottis. Moreover punges is very characteristic because of epidermis and 

 openings. Merkusii has 2 parenchyma resin ducts, however, with densiflora and Massoniana 

 are found also two in the corners next to the subcutanes of the upper surface. 



Work is progressing slowly because at present I have much garden work. I had hoped 

 so to revise all of the material from you during Easter, so that I could immediately 

 write down everything of which I again wished to have needles, because the first ones 

 did not give good preparations, but I see that thereby I would delay the letter 



still more, because I will not get finished so quickly, because moreover now I am Publish- 

 ing also the Autumn l879ialso the current months of 1880 and for still some time will 

 have this double work. The Cubensis is very characteristic and closely related to the 

 Australis, but the Qccidentalis of Domingo has more different forms as you already have 

 differentiated the Wrightiana . I am surprised that you cite Teste Pariatore the Brutia 

 as Pyrenaica because it definitely does not grow in Spain and southern France, at the 

 least in the Pyrenees, where no form at all of the halepensis occurs and of those mentioned 

 by Pariatore classicis there is nothing to find except uncinata and silvestris , even the 

 Leinicio var. pyrenaica I could not obtain from these Sites. The form of silvestris , 

 which grows there and in all of northern Spain, moreover deviates off more than any 

 other from Asia and Europe; it has the bast cells between the vascular bundles not 

 thickened. 



Recently I received as parviflora from Japan a new pine with only one resin duct. 



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