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Spore

Spores are the reproductive cell structure of ferns, fungi and mosses. Fern spores develop inside small green capsules on the underside of the fronds, called sporangia. These types of plants do not form flowers nor produce seeds.

Spores are usually haploid and unicellular and are produced by meiosis in the sporangium of a diploid sporophyte. Under favourable conditions the spore can develop into a new organism using mitotic division, producing a multicellular gametophyte, which eventually goes on to produce gametes. Two gametes fuse to form a zygote which develops into a new sporophyte. This cycle is known as alternation of generations.

The spores of seed plants, however, are produced internally and the megaspores, formed within the ovules and the microspores are involved in the formation of more complex structures that form the dispersal units, the seeds and pollen grains.
Posted on May 8th, 2014
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