WT5BZ]The four celled mature pollen of Ginkgo biloba L. just shed from the microsporangia, was round in shape and contained a very large germination area with monosulcate sulcus walled with two semicircular and nearly perpendicular parts of exine, and the pollen was coated with a compact irregular striations and spinules in parts other than the germination area. The pollen became boat shaped and was bilaterally symmetrical when it was in air or under cold storage, but rapidly rounded off in cultural ...
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