Gynospore Formation in Sequoia sempervirens

Nature

Gynospore Formation in Sequoia sempervirens"


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IN spite of the intrinsic interest of the redwoods and mammoth trees of California their gametophytes and embryogeny were poorly known until recently. Lawson's1 account of Sequoia


sempervirens was unsatisfactory and incomplete and only a cursory reference by Arnoldi2 was available for S. gigantea. Looby and I3, however, described recently fertilization and proembryo


formation in S. gigantea for the first time and also extended and amended Lawson's1 account of these features in the redwood; while Buchholz4 afterwards dealt with the embryogeny in both


types. It is clear from the results recorded that development in these two trees is so different that they can no longer be retained in the one genus.


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