Abstract
SUMMARYThe authors cultivated in vitro pollen grains of Ceratozamia mexicana and Cycas revoluta. In Ceratozamia the microgametophytes developed up to complete spermatogenesis, and tissue proliferation of the parenchyma type was observed on a medium modified with 2.4-D. In Cycas microgametophytes developed only up to the immature sperm mother cell stage.
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