Results 201 to 210 of about 2,327 (226)
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WHAT IS ZAMIA PRASINA (ZAMIACEAE: CYCADALES)?
2009(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Calonje, Michael, Meerman, Jan
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COMPARATIVE POLLEN MORPHOLOGY AND TAXONOMIC AFFINITIES IN CYCADALES
American Journal of Botany, 1988Scanning and transmission electron microscopy of pollen grains of 29 species, representing the ten extant genera of Cycadales, has provided valuable insight into their relationships. Pollen grains of these taxa are boat‐shaped, monosulcate, and bilaterally symmetrical.
Bijan Dehgan, Nancy B. Dehgan
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Possible Early Pennsylvanian Ancestor of the Cycadales
Science, 1990A specimen of Lesleya , previously known only as isolated sterile foliage, has been found with two rows of ovule-bearing receptacles on opposite sides of the petiole. This specimen is from the Lower Pennsylvanian (Namurian B or C) of western Illinois.
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Seed Coat Anatomy of Ceratozamia mexicana (Cycadales)
The Botanical Review, 2004I. Abstract The seed coat furnishes protection with a thick cuticle, tannin cells, mucilage, and a hard sclerotesta. The external layer of the seed coat is a sarcotesta; a thick cuticle covers the external walls of its epidermal cells. This epidermis bears stomates and, in the early stages, trichomes. The subepidermal cells have druses.
María Ydelia Sánchez–Tinoco +1 more
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Annales de Paléontologie, 1999
Abstract The lagoonal Cenomanian formation (Lower Cretaceous) of clays of the region of Baugeois (north of Angers) has supplied an exceptionally well-preserved fossil flora: leaves, woody structures or/and reproductive organs of pteridophyta, gymnosperms and angiosperms.
Martine Berthelin, Denise Pons
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Abstract The lagoonal Cenomanian formation (Lower Cretaceous) of clays of the region of Baugeois (north of Angers) has supplied an exceptionally well-preserved fossil flora: leaves, woody structures or/and reproductive organs of pteridophyta, gymnosperms and angiosperms.
Martine Berthelin, Denise Pons
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Biflavonoids from the seed testa of cycadales
Phytochemistry, 1982Abstract Biflavonoid patterns from ethanolic extracts of the brightly coloured testa of eight species of Cycadales have been determined. Species from the genus Macrozamia are characterized by the occurrence of cupressuflavone- and amentoflavone-based patterns, while the Cycas species contain only amentoflavone-based patterns.
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