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BROOKLYN BOTANIC GARDEN MEMOIRS 



each while others were borne singly on sprouts one to three centi- 

 meters long and were of considerable size. 



The formation of new tubers directly from old ones in this manner 

 is so common as to attract little attention. The unusual features of 

 the present case were: (i) The large size of the new tubers. Many 

 of them had a weight of 25-30 grams, several of 50-60 grams, and 

 one weighed 67 grams. (2) The formation of new tubers within old 



Fig. 2. A new tuber protruding from a slit at the bud end of an old seed tuber. 

 Nat. size. (Compare Fig. 3.) 



ones. Fifteen of the old tubers had large new tubers protruding from 

 slits in their sides (Figs. 1-2). In one instance a new tuber weighing 

 about 28. grams was wholly included within the parent tuber. This, 

 like most of the protruding new tubers, was considerably flattened 

 by the pressure to which it had been subjected during its growth. 



This phenomenon of large new tubers within old ones was a sight 

 calculated to excite wonder in the beholder. To the mycologist it 

 suggested the bursting of the volva in the egg stage of the phalloids. 



