26 



BURSA BURSA-PASTORIS AND BURSA HEEGERI : 



Two orig-inal cultures of B. bp. simplex were grown from seeds col- 

 lected at Edgewood, New Carlisle, Ohio, by J. Marion Shull, June 2 to 17, 



1905. In the parents of both these cultures (040.5 and 040.6) the lobes 

 were undivided and not elongated, though they were somewhat triangular- 

 acutish. One of these (040.6) had a more tapering apex than the other 

 and its lateral lobes were more divaricate and more acute, but their prog- 

 enies were generally indistinguishable from each other. Only one speci- 

 men among the offspring of 040.6 had the long, tapering apex of the parent, 

 this fact apparently showing the difference between the two parents in this 

 regard to be a simple fluctuation. 



These two lots of seed were sown June 26, 1905. The first (040.5) 

 prodticed 170 plants which, except for some slight fluctuations, were evi- 

 dently of a single type. A second generation of 44 plants raised from the 

 seeds of an average specimen (055.24) kept strictly to the same type. 

 The other original culture (056) consisted of 425 specimens, all but 5 of 



which were typical B. bp. simplex. The 5 

 aberrant specimens belonged to B. bp. rhom- 

 boidea (fig. 20), whose presence in this family 

 was assumed to be due to chance crosses in 

 nature. This assumption was tested by rear- 

 ing a family from seeds of one of these 

 (056.130). Its hybrid character was fully 

 demonstrated, and the results are given in 



^'\ 17;T/""^/«''^f-^^^^''"'^ detail in the section devoted to hybrids (p. 42) . 

 rhomboidea. Climax-leaves of 



a plant growing in a dooryard Some fluctuation was observed among the 

 near Cold Spring Harbor, Long Specimens of B. bp. simplex. A very few 

 Island. somewhat stunted specimens had the leaves 



smaller than normal, somewhat shining, and with the lobes more crowded. 



One of these (055.103) was tested. Fully guarded seeds were sown July 18, 



1906, and produced 48 specimens, all but one of which were typical B. bp. sim- 

 plex, the one slightly aberrant specimen having a more coriaceous texture 

 and slightly more distant lobes than the others. It is probable that this 

 also represents a mere fluctuation. Other variations among the members 

 of the original families have not been fully tested as yet. Thus in one the 

 leaves were broader than in the usual form, in another the sinuses were 

 deep and the lobes rather long, strongly divaricate, and acutish. There 

 can be little doubt that these are fluctuations which would be but slightly 

 if at all apparent in their offspring. 



0S0.S2 



