[Laboratory IX -- <EM>Ginkgo,</EM> <EM>Cordaites,</EM> and the Conifers]


VIRTUAL GALLERY (I)


Ginkgo

1:1
Extant Ginkgo biloba branch showing leaves born on short shoots off the long shoots.
1:2
Extant Ginkgo biloba paired ovules born on the short shoots.
1:3
Extant Ginkgo biloba maturing ovule: earliest stage.
1:4
Extant Ginkgo biloba maturing ovule: second stage. Note pollen chamber
1:5
Extant Ginkgo biloba maturing ovule: third stage. Note differentiation of integument and formation of the megagametophyte (why can't you see it?) inside the megasporangium (nucellus).
1:6
Extant Ginkgo biloba maturing ovule: mature stage. Note micropyle. Where do you expect to find the archegonia?
1:7
Extant Ginkgo biloba microsporangiate strobilus. To each lateral appendage are attached two to four pendant microsporangia.
1:8
Ginkgo leaf from the Miocene of Oregon.
1:9
Sphenobaeira highly dissected leaves. From the Triassic of South Africa.


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