Tetrasporangium

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Tetrasporangium

 

the sporangium of red algae and certain brown algae (Dictyotales), in which tetraspores develop.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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Saenger & Wollaston (1982), however, found slightly elongate terminal cells in the type specimen of the taxon and stated that "in the limited material available, no more than one tetrasporangium has been observed on each fertile whorl-branchlet" (page 81) suggesting that they had limited access to tetrasporic material of the species, and they could not dismiss a priori the presence of several tetrasporangia per whorl.
Tetrasporangia and cystocarps in our specimens were larger than those in Littler & Littler (2000): 40-50 [micro]m and up to 150 [micro]m, respectively.
Tetrasporangia oval, tetrahedrally divided, 90-105 [micro]m long and 60-63 [micro]m in diam.