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Gametophytes and Young Sporophytes of Ophioglossum crotalophoroides Walt
Michael R. Mesler
American Journal of Botany
Vol. 63, No. 4 (Apr., 1976), pp. 443-448
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2441911
Page Count: 6
You can always find the topics here!Topics: Gametophytes, Sporophytes, Embryos, Plant cells, Apical meristems, Stems, Growing seasons, Species, Biological taxonomies, Life cycle
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The lens-shaped, dorsiventral gametophytes of Ophioglossum crotalophoroides are superficially different from the cylindrical gametophytes of other species of Ophioglossum. However, they have the same features as other Ophioglossum gametophytes (fundamentally axial organization, radially symmetrical apical meristem, radial distribution of gametangia) except that the cylindrical axis is reduced in length. Young sporophyte development is unique in the genus: all primary organs clearly arise from the embryo and develop simultaneously. The length of the life cycle of O. crotalophoroides is considerably shorter than that of some other species in the Ophioglossaceae. A timetable for gametophyte and young sporophyte development is postulated. Spores germinate soon after they are released in the spring, and mature gametophytes develop by the next growing season. Fertilization occurs approximately one year after spore dispersal, and after two years, the photosynthetic first leaf of the young sporophyte emerges.
American Journal of Botany © 1976 Botanical Society of America, Inc.