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15 Cards in this Set
- Front
- Back
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Name the rest of the gymnospems (not cycads or ginkos) |
Conifers and gnetales |
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Describe cordaitales |
Carboniferous origin, extinct by the end of the Permian Closest relative/ancestor to Conifers |
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Describe Pine Shoots |
The main stem axis is a long shoot Short shoot are fascicles (stems with needle like leaves 1-8) |
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Describe a pine leaf cross section |
Vascular tissue in the middle Endodermis RESIN CANALS Stomata |
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Describe a pine stem cross section |
PYCNOXYLIC WOOD (more tracheids= hardwood) Primary and secondary xylem Secondary phloem RESIN CANALS |
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Describe pine roots and mycorrhizae |
Hyphae (mycorrhizal fungus) film on outside Mycorrhizae found in between (intra) outer cortex cells Cyanobacteria |
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Describe Pine male cone |
Microsporophylls with microsporangia (multiple) inside underneath the sporophyll Many Pollen grains inside microsporangia MALE CONE ON SHORT SHOOT |
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Describe pine pollen |
Top to bottom center: tube cell Generative cell (sperm) Prothalial cells Wings or air sacs |
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Describe pine pollen siphonogamy |
Pollen tubes deliver non-motile mobile sperm directly to the egg in archegonium |
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Describe female pine cone |
Young ovules Ovuliferous scale: short shoot Primary axis: long shoot Ovule Bracts: modified leaf under |
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Describe mature female megagametophyte |
Micropyle In the microsporangian wall (nucellus) |
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Describe pine embryos |
Large Cotyledons in middle Shoot (bottom) and root (top) Suspensor at top |
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Describe Gnetum |
~30 species Tropical central america, asia, and mosses Africa Typically a woody vine |
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Describe Ephedra |
~40 species Arid environments (West US, South America, Europe, asia, N. Africa) Shrubs ephedrine medication |
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Describe the Welwitschia mirabilis |
1 exant species Is Ephedra Nambia Desert (SW Africa) Only produces 2 leaves |
