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One of the haploid asexual spores of the red algae formed in groups of four.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an asexual spore characteristic of red algae and some brown algae (Dictyotales). Tetraspores are formed in groups of four in a tetrasporangium as a result of the meiosis of the nucleus. They arrange themselves in the shape of a tetrahedron or sometimes in the shape of a square or in a single line. Tetraspores lack organs of locomotion. After the spores settle, the thin sheath that encases them thickens and the spores germinate.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Spore survival and attachment success will influence the number of tetraspores germinating and ranges from 0% to 85% (Buschmann et al.
Carpospores (either sexual or apomictic) mature in September and release thereafter through November, and tetraspores release from December through March (Burns and Mathieson 1972, S.
stellatus have found that germination rates of tetraspores, in particular, are low (Maggs 1988), and field studies on the west coast have noted the complete absence of recruitment of M.
Parasite male and female gametophytes arise from 2N tetrasporangia (formed by the tetrasporophyte), which undergo meiosis to produce four tetraspores (meiospores), two that will form male and two that will form female gametophytes.
Specimens were further confirmed by the presence of zonate tetraspores embedded in surface patches within the thalli.