. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. BIOTYPES AND HYBRIDS. A VARIABLE SERIES OF DOUBTFUL SIGNIFICANCE. 27 Besides the four forms named and described above, which have been shown to breed true to type with only slight fluctuations, most of my at- tention has been given to a series of cultures whose behavior has been up to the present time quite baffling. Some time I hope to understand this group better, and I shall then have more to say about it, but its behavior is in such striking contrast to that of the biotypes already described
. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. BIOTYPES AND HYBRIDS. A VARIABLE SERIES OF DOUBTFUL SIGNIFICANCE. 27 Besides the four forms named and described above, which have been shown to breed true to type with only slight fluctuations, most of my at- tention has been given to a series of cultures whose behavior has been up to the present time quite baffling. Some time I hope to understand this group better, and I shall then have more to say about it, but its behavior is in such striking contrast to that of the biotypes already described that it seems only fair to give a short epitome of my results as they now Fig. 18.—Bursa bursa-pastorisrhomboidea grown from guarded seed of the plant shown in fig. 17. Two specimens ( and ) were taken into the sky-lighted room from different habitats near Cold Spring Harbor, Long Island, in the very beginning of these cultures, April 15 to 20,1905, and allowed to ripen seed. The aspect of these two specimens was very diverse. One () was robust and had rather firm, thickish leaves with 4 or 5 pairs of oblong, ob- tuse, wavy lobes, while the other () had a small rosette with thin, flat leaves and few triangular lobes. Notwithstanding these differences, the offspring of the two plants, as followed in numerous cultures through several successive generations, were indistinguishable from each Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Shull, George Harrison, 1874-1954. Washington, Carnegie Institution
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