20 



BURSA BURSA-PASTORIS AND BURSA HEEGERI 



Fig. 11. 



Fig. 10. 



FIG. 9. Bursa bursa-pastoris tennis from my first pure culture of this biotype. 



FIG. 10. Bursa bursa-pastoris tennis from ;i hybrid progeny. 



FlG. 11. Bursa bursa-pastoris tenuis. A stunted sib of plant shown in fig. 9. 



