THE RESEMBLANCE BETWEEN TWINS, A STATISTICAL EXAMINATION OF LAUTERBACH'S MEASUREMENTS

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Abstract
Among the F1 offspring from matings between typical clones of Sphaerocarpos donnellii, as well as from matings of tufted [female] X typical [male], typical [female] X polycladous [male] and tufted [female] X polycladous [male], clones occasionally appear which differ from those classed as "typical" only by occasionally displaying an unusually large proportion of variant involucres. Matings of such doubtful clones with typical clones of opposite sex produce the same classes of F1 offspring as matings between typical clones, i.e., pre-ponderance of typical, and a few "possibly atypical," clones. It is concluded that the differences between "typical" and "possibly atypical" clones are purely pheno-typic. It thus appears that the great majority of the plants of S. donnellii, as represented about Sanford and Miami, Florida, are genetically similar so far as present criteria can determine. The only genetically distinct form occurring with any frequency is the "tufted" one.