Tetraspores
Encyclopedia
Tetraspores are red algae
Red algae
The red algae are one of the oldest groups of eukaryotic algae, and also one of the largest, with about 5,000–6,000 species  of mostly multicellular, marine algae, including many notable seaweeds...

 spores produced by Tetrasporophyte. These Spores are the result of a meiosis
Meiosis
Meiosis is a special type of cell division necessary for sexual reproduction. The cells produced by meiosis are gametes or spores. The animals' gametes are called sperm and egg cells....

cycle in the Tetrasporophyte. The name is derived from the 4 spores that form after this meiosis.
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