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288
HELGE JOHNSSON
Fig. 1. Unequally growing plants. The middle one
luxuriant. Chroniosome numbers from left 2n = 32,
29 and 42.
behaves as a primary diploid in spite of its high basic number, n=14
[cf. Löve. 1944). A noteworthy feature is that no unreduced gamete
appears to have functioned. A prerequisite for the formation of such
must, however, be considered to have been present in the very irregulär
ineiosis of the triploid. Whether any gamete with the exact diploid
number, /i = 28, has functioned is not evident. Plants with 2n = 42—51
may have arisen through the union of a gamete having 28 chromosomes
and one having another number. The plant with 2/i = 51 may have
resulted from the combinations 28 + 23, 27+24 and 26 + 25
chromosomes under the presupposition that the chroniosome distribution during
meiosis is always 14—14 pius a varying number of the odd
chromosomes. The chroniosome number 2n = 51 can also be conceived as
arising through the conjugation of. e.g. a 37-chromosomal and a 14-
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