tetraspore

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tetraspore

the product of MEIOSIS in many red and brown algae, being produced in fours in testrasporangia and forming the first cells of the GAMETOPHYTE generation.
References in periodicals archive ?
Basidia 25-29 x 6.5-8 [mu]m, cylindro-clavate to clavate, bi- and tetrasporic, hyaline (Fig.
Basidia 24.5-35 x 5.5-6.5 [mu]m, cylindro-clavate to clavate, tetrasporic, hyaline (Fig.
Specimens observed: San Andres Island: Wild Life: Tetrasporic and vegetative specimens, 2/XI/2012, depth 13 m.
Specimens observed: San Andres Island: Wild Life: Vegetative specimen; 4/IV/2013, depth 13 m; Vegetative specimen, 7/VI/2013, depth 14 m; Tetrasporic and vegetative specimen, 9/VIII/2013, depth 14 m.
Compared with female gametophytes (cystocarpic thalli) (29.4 [+ or -] 2.9%, n = 14), the tetrasporophytes (tetrasporic thalli) are usually less abundant (24.5 [+ or -] 3.4%, n = 14); the predominance of gametophytes in C.
In contrast, the absence of callose in the cell walls of MMCs is a consistent phenomenon in tetrasporic (sexual) species (Rodkiewicz, 1970) and in all diplosporous species studied to date, which includes E.
Callose deposits are absent in (i) MMC walls of angiosperms that undergo a megasporogenesis of the tetrasporic (meiotic karyokineses but not cytokineses) form (Rodkiewicz, 1970), which, if consistent across all tetrasporic species, would involve about 95 genera (Johri et al., 1992), and (ii) pollen mother cells (PMCs) of monosporic Pergularia L.