Jacoby 2 Dec. 1,1857 



Another Statement in my las 4 -- letter refers to the Observation: 

 ma^e by rae or rather by Labouret, that not all fruits of Hanmila*- 

 riae are entirely H laevls H .Lab, sent ne during past Spring a fruit 

 of a plant closely related to M.Cpt. ? on which small' hairyness 

 shows. Observed under the microscope, the individual hair appear 

 broad not round. The fruit has 4 of them, of which 2 are more speci- 

 f ically deve^pled as hair tufts than the two others. Two of them 



stand more toward the Tower part of the seeds, while the two others? 



tend more toward the "nucro" , but allare arrann-ed spirally around^ 



the fruit.. In consequenoe of this remark, I turned my attention this 



Summer toward this ciroumstanoe, and thus foimd, that the fruits of 



exorescenses 



se^eral Mammilariae carry stränge sx^xs-ftraMS , which can not be named : 

 scales nor hair. I observed them with M. sernoervivi , raacrothel e , Web- 

 biana, Webbiana longispina, Salmiana, magniraamma , az i e t i na , c ent r i c i rra , , 

 Faerateri, and mercacantha. The se are long, roimd , pointed exorescen- 

 ses as long as they are fresh f often extended horn-like, mostly ad - 

 pressed in the dry State but, also not transparent white like the hair 

 tufts of the fruit of Labouret but li^rht-colored , opaque. In fresh 

 State they have the colors of the fruits themselves. I mailed you, 

 with my present shipment of seed,.as rauch as ever possible, entire 

 fruits, so that you may also bring into the circle of your obser- 

 vations their form and coloration. Of these fruits you will find one 

 like M. . arietina , on which the described excrescenses are distribu- 

 ted raost visiblyjln the fashion described with it.. In the diagnosis of 

 the di vi sion v< Mammilaria it raust say ' M, nudea plerunque laevis" with 

 not undue Sketches giving explanations of these hair and protube- 

 rances. 



May-be you remember, that this Spring, as we met in Berlin' , 

 I told you, that I had received a E.Thomensi s^ rom Labouret , which 

 is sup posed to exist at 43 latitude. You doubted this then defini- 

 tively, as in the northern half of the globe cacti do not exceed the 



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Missouri 

 Botanical 

 Garden 



