. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. 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 ( and ) the lobes were undivided and not elongated, though they were somewhat triangular- acutish. One of these () had a more tapering apex than the other and its lateral lobes were more divaricate and more acute, but their prog- enies were generally indist
. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. 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 ( and ) the lobes were undivided and not elongated, though they were somewhat triangular- acutish. One of these () 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 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 () 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 () 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 (). 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 () was tested. Fully guarded seeds were sown July 18, 1906
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