please do not put your backpacks, books, or clothes on the tables where the microscopes are
DESCRIPTION
Please do not put your backpacks, books, or clothes on the tables where the microscopes are. Thanks!. If you need a map for Saturday’s field trip, please pick one up from the front desk. Gymnosperms (non-flowering seed plants) EKU BIO 131. Gymnosperms. Phylum Ginkgophyta - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/1.jpg)
Please do not put your backpacks, books, or clothes
on the tables where the microscopes are.
Thanks!
If you need a map for Saturday’s field trip, pleasepick one up from the front desk.
![Page 2: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/2.jpg)
Gymnosperms(non-flowering seed
plants)
EKU BIO 131
![Page 3: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/3.jpg)
Gymnosperms
• Phylum Ginkgophyta Ginkgo – the only species is Ginkgo biloba
• Phylum Cycadophyta the cycads
• Phylum Coniferophyta (or Pinophyta) the conifers
• Phylum Gnetophyta the gnetophytes
![Page 4: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/4.jpg)
Ginkgoovule and seed development
![Page 5: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/5.jpg)
Ginkgophyta
Leaves and seeds
microsporangiaon male tree
ripe seeds
cleaned seeds (sometimescalled “Ginkgo nuts”)
germinating seeds
![Page 6: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/6.jpg)
Cycadophyta sporophytes
Two explorers with the only wildspecimen of Encephalartos woodii everdiscovered. It was first discoveredin the early 1700s.
![Page 7: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/7.jpg)
Cycad cones
seed cones
pollen cones
Encephalartoswoodii
![Page 8: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/8.jpg)
Cycad sporangia and coralloid roots
note microsporangium,tapetum, microspores
note integuments, megasporangium,Female gametophyte
coralloid roots root with zone of symbiotic cyanobacteria
![Page 9: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/9.jpg)
ConiferophytaPollen cone buds of Japanese Black Pine (at about meiosis time)
photo by Ross Clark
pollen conebuds(the dark spotsare the tips ofthe microsporophylls)
buds containingneedles
![Page 10: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/10.jpg)
Pine pollen developmentbe able to identify all structures
Coniferophyta
![Page 11: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/11.jpg)
Pine ovule developmentbe able to identify all structures
Coniferophyta
![Page 12: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/12.jpg)
Gnetophyta: Gnetum
notice stamens and ovules (plant is monoecious)
seeds
![Page 13: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/13.jpg)
Gnetophyta: Ephedra
male female
(Ephedra is dioecious.)
seeds
Ephedrine is potentiallydangerous.
![Page 14: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/14.jpg)
Gnetophyta: Welwitschia
Welwitschia is definitely one of the world’s most unusual plants!
Here is Welwitschia’s only habitat: the Namibian Desert, one of the driest deserts in the world.
Welwitschia is one ofThe world’s rarest plants. Most of the following photos were taken by Terry Huff, an EKU graduate student.
photo by Terry Huff
![Page 15: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/15.jpg)
Gnetophyta: Welwitschia
photo by Terry Huff
Welwitschia has two leaves. They have basal meristems. The leaves eventually become separated into tattered segments.
Welwitschia is dioecious. This is a female plant. Note the ovulate (seed) cones, and compare them with the pollen cones on the next slide.
Here is a young plant. Young plants are extremely rare.Note the two leaves.
photo by Terry Huff
![Page 16: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/16.jpg)
Gnetophyta: Welwitschia
photo by Terry Huff
Here is a male plant. Note the smaller pollen cones.
photo by Terry Huff
![Page 17: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/17.jpg)
Gnetophyta: Welwitschia
photo by Terry Huff
photo by Terry Huff
Here are some female (seed)cones, together with the small bugs that live on Welwitschiaand may help to pollinate it.
photo by Terry Huff
![Page 18: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/18.jpg)
Gnetophyta: Welwitschia
photo by Terry Huff
photo by Terry Huff
Here are some female cones, together with the small bugsthat live on Welwitschia and may help to pollinate it.
Here are some very young seed cones, at about pollination time.
photo by Terry Huff
![Page 19: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/19.jpg)
Gnetophyta: Welwitschia
photo by Terry Huff
photo by Terry Huff
Here is another nice photo of a plant loaded with seed cones. Very few of the seeds germinate, because of the extreme environmental conditions in the Namibian Desert.
photo by Terry Huff
![Page 20: Please do not put your backpacks, books, or clothes on the tables where the microscopes are](https://reader036.vdocument.in/reader036/viewer/2022062322/568151df550346895dc01800/html5/thumbnails/20.jpg)
Why so many photos of Welwitschia?
-- because these photos by Terry Huff are some of the best photos ever taken of Welwitschia in its native habitat. They are better than any other photos you will find in any textbooks or on the web.
Terry said he was told there were fewer than 20 Welwitschia plantsremaining in their native habitat.