Die Meiosis von Haplodiplonten

The Evolutionary Significance of Autopolyploidy

“…Besides the typical instances of autosyndesis discussed above, which indicate complete or almost complete autopolyploidy, many other cases are known (cf. BLEIER, 1934) in which autosyndesis may be only partial. There seem to be continuous transitions between the cases of complete autosyndesis and such cases in which this phenomenon ceases to be apparent.…”

DEVELOPMENT OF SPORES AND GAMETOPHYTES IN CERTAIN NEW WORLD SPECIES OF SALVIA

“…The spacing of the chromosomes in this prophase is such that a count is easily possible, the number being 15 (Figs,g,10). Bleier (1933) found similar instances of chromosome spacing in Oenothera franciscana, but he calls it an early telophase, since equational separation has taken place. He thinks the spacing is due to some injury of the cell by which the movement of the chromosomes is hindered.…”

Some New Features in the Reproductive Cytology of Angiosperms, Illustrated by Isomeris Arborea

“…Henee Isomeris arborea doubtless finds a place among the haplodiplonts. Bleier (1933), who thus designates sporophytes which exhibit no diploid condition, has published a list of fifteen haplodiplonts of the "Datura stramonium" type (Sharp, 1934). This species, according to Belling & Blakeslee (1927), shows both an n and a 2w count of 12, the Datura monoploid number.…”

“…In Datura, according to Belhng & Blakeslee (1927), there is a random distribution of the chromosomes without splitting in I, but with equational division in II. In Oenothera franciscana and 0. hookeri, Bleier (1933) reports that part of the chromosomes in I pass to the poles undivided, while others split. In 0. franciscana 22 % of the chromosomes show no equational division in I, but pass at random to the poles.…”