Observations cytologiques sur la Phéophycée d'eau douce:Heribaudiella fluviatilis(Aresch.) Sved.

Abstract

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Brown Algae

“…Stains may be used to emphasize important structures, in particularly cresyl blue (Chadefaud, 1950;Schloesser and Blum, 1980), which may be used to demonstrate physodes (which store phaeophycean tannins). Species that become calcified with CaCO 3 (especially Pleurocladia, Porterinema) may require treatment with dilute acid (1% HCl) to improve observation of cellular detail.…”

“…The macroscopic color varies from brown to pale tan or gray, depending on the quantity of carbonate co-precipitation (Schloesser and Blum, 1980;Kusel-Fetzmann, 1996;Wehr et al, 2013). Many species contain many light-refractive bodies, including physodes, darkly pigmented vesicles that store phaeophycean tannins (fucosan), other polyphenolics, and terpenes (Chadefaud, 1950;Schoenwaelder, 2008). Cells contain one to several golden-brown chloroplasts, which may be discoid, ribbon-like, or irregularly shaped, and usually parietal.…”

“…While experimental data are lacking, reports suggest that the growth of Heribaudiella fluviatilis, Pleurocladia lacustris, and Sphacelaria fluviatilis may be greatest in flowing waters (Jao, 1943;Kann, 1978a;Wehr and Stein, 1985;Kusel-Fetzmann, 1996). Among all phaeophyte species that occur in running waters, nearly all reports describe rocky, clear-water streams and rivers (Budde, 1927;Fritsch, 1929;Allorge and Manguin, 1941;Jao, 1941;Chadefaud, 1950;Whitton, 1975, 1977a;Kann, 1966;1978a,b;Wehr and Stein, 1985;Kusel-Fetzmann, 1996;Wehr and Perrone, 2003;Wehr et al, 2013) and very few turbid or muddy habitats . Among all phaeophyte species that occur in running waters, nearly all reports describe rocky, clear-water streams and rivers (Budde, 1927;Fritsch, 1929;Allorge and Manguin, 1941;Jao, 1941;Chadefaud, 1950;Whitton, 1975, 1977a;Kann, 1966;1978a,b;Wehr and Stein, 1985;Kusel-Fetzmann, 1996;Wehr and Perrone, 2003;Wehr et al, 2013) and very few turbid or muddy habitats .…”