Its chief constituent is mannite or manna sugar, a hexatomic alcohol, C6H8(OH)6, which likewise occurs, in much smaller quantity, in certain species of the brown seaweed, Fucus, and in plants of several widely separated natural orders.
In the Algae, such as Fucus, Volvox, Oedogonium, Bulbochaete, and in the Fungus Monoblepharis, the spermatozoid is a small oval or elongate cell containing nucleus, cytoplasm and sometimes plastids.
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