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Biol Bull 99: 272-284. (October 1950)
© 1950 Marine Biological Laboratory
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REPRODUCTION OF DUDRESNAYA CRASSA HOWE

WM. RANDOLPH TAYLOR 1

1 University of Michigan

1. In Dudresnaya crassa the simple carpogenic branches reach a length of 6-10 cells. The auxiliary branches are much longer and taper at each end, but about 6-10 cells in the middle portion are enlarged, the functional auxiliary cell being a smaller one near the middle, and sterile branchlets are often formed laterally below.

2. Fusion of a spermatium with the trichogyne causes the development of a connection between the carpogonium and a lower cell in the branch. From this, and generally from the next subjacent cell. oöblasts are produced. There is generally no demonstrable connection which could deliver a diploid nucleus to the cell which produces this second oöblast.

3. The original oöblasts, and additional ones from each active cell, seem equally able to grow out, reach auxiliary cells, and initiate cystocarp formation.






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