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T he structure of orchid flowers is unique among floral plants. The orchid flower is typically has an outer whorl of three sepals, an inner whorl of three petals, and a single large column (the gynostemium, composed of the male stamens attached to the female pistil) in the center.The sepals are the protective cover of the flower bud.his is the primary identification feature of an orchid. At the top of the column is the male anther which contains packets of pollen called pollinia. Below the anther is the stigma, a shallow, usually sticky cavity in which the pollen is placed for fertilization.
Morphology. Diatoms are algae with distinctive, transparent cell walls made of silicon dioxide hydrated with a small amount of water (Si02 + H20).Silica is the main component of glass and hydrated silica is very like the mineral opal, making these algae, often called algae in glass houses more like algae in opal houses.he centric diatoms are not able to move, but some pennate diatoms may move across surfaces or up and down within sediments. Cells are able to move by a structure termed the raphe. The navigation of this site is organized around shape categories (morphological groups), into which we have grouped all of the genera.