2 Sentences With "strobiloid"

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Pollen is contained in sacs of two to four at the tips of sporophylls on the strobiloid. Ovules of Ginkgo trees come from stalks from leaf axils on the short shoots, each containing two ovules. The ovule is fertilized by the flagellated male gametes, which can move about freely. This fertilization process begins on the tree itself in the spring.
The Strobiloideae are an obsolete taxonomic name, a subclass of both Monocotyledons and Dicotyledons proposed by Charles Bessey in 1915 in his taxonomic classification of plants. In this sense by not being unique it breaks the rules of botanical nomenclature as currently used, however Bessey actually used a qualifying hyphenation (Alternifoliae-Strobiloideae and Oppositifoliae-Strobiloideae), a distinction not always recognised in reference to this scheme. Bessey believed in the strobiloid theory of plant evolution that postulated that the Angiospermae (flowering plants) originated from Cycadophyta, and that flowers originated from a primitive vegetative shoot that developed into a structure with perianth, stamens and carpels. From this arose two lines, the Strobiloideae (or Ranalian line) with connation of like parts and the Cotyloideae (or Rosalian line) with connation of unlike parts, which he assigned as the two subclasses of monocots (called Alternifoliae by Bessey), but also of dicots (called Oppositifoliae by Bessey).