Lycopods
After viewing an image click "back" to return to this page.
Lycopodium cone x12. This genus is HOMOSPOROUS, which means its cones produce only one kind of spore.
Lycopodium cone x30. Note the leaves (sporophylls), each with a sporangium attached to its upper surface.
Lycopodium rhizome xs x20. Plates of xylem surround by
phloem are in the center. Note the scale-like leaf with the
characteristic single vein on the lower left.
Selaginella cone ls x30. Sporangia are on the upper surface
of the fertile leaves. Some sporangia bear 4 megaspores and some bear
many microspores. Thus, this genus is HETEROSPOROUS because it produces
two kinds of spores.
Selaginella cone, whole x12. You can see megasporangia and dark microsporangia.
Selaginella rhizome xs x20. The small structures are roots.
Return
to the Plant Biology index page.
Return to the O.S.U. Lima home page.
