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Biology 337: Divisions ( Glossary \| Divisions )
Taken Spring 2005, with Dr. Plant. Information here is based primarily upon notes from class but some from external sources like the web.

age	Permian
division-name	Gingkophyta
evolution	Ancestors are unknonw.
gametophyte	.
habit	.
leaves	megaphyll Most distinctive feature of plant. Consist of: Petiole Fan-shaped lamina divided into 2 lobes. Deciduous and leaves are lost at end of growing season
life-cycle	Homosporous and Heterosporous Dioecious Ginkgo produces flagellated sperm that must swim to the archegonium Fertilization itself often occurs after shedding of ovule. Another primitive trait. Similar to cyads in reproduction and production of sperm. Gingko and Cycads are the only gymnosperms to produce motile sperm.
links	Handy quick reference
members	Only one living member left, Gingko Biloba (which is possibly the oldest living seed plant)
rhizome	.
roots	.
sporangia	.
stems	Typical of gymnosperms, pith and cortex are small Gingko produces 2 types of shoots: Long shoots - widely separated leaves and nodes Spur shoots - slow gorwing shoots with crowded nodes (not much growing means that it looks like there's an explosion of leaves) Secondary growth is similar to the conifers. 2ndary growth and wood structure Has spur shoots
stomata	.
traits	.
vascular-system	eustele Vascular cambium produces a large amount of secondary xylem dominated by tracheids. Conifer-like wood. Pith and cortex are small

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