01:119:115 Lecture Notes - Lecture 8: Lycopodiopsida, Pollen Tube, Microphyll
8 Jul 2015
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Lecture 8: ferns (seedless vascular plants) (fig 29. 12, leaves are primary organ for photosynthesis. Sporangium on sporophyll > single type of spore > typically a bisexual gametophyte > egg or sperm. Heterosporous spore production (some seedless vascular plants: all seed plants) Megasporangium on megasporophyll > megaspore > female gametophyte > eggs. Microsporangium on microsporophyll > microspore > male gametophyte > sperm. The life cycle of a fern fig 29. 11. Lecture 8: animal dispersed, it is not fertilization, some gymnosperms have retained flagellated sperm (but most have non- flagellated sperm, all angiosperms have non-flagellated sperm. 2) advantage of non-flagellated sperm is that can colonize dry habitats (not water dependent like non-vascular and seedless vascular plants) Life cycle of a pine (fig 30. 4: tree is mature sporophyte (2n, sporangia on scales packed tightly on cones, in most spp. each tree has 2 types of cones, pollen cones. Pollen grain contains male gametophyte: ovule cones.
