Quelques remarques sur la Classification des Algues bleues

Abstract

La pr@aration du troisi~me tome de notre ouvrage sur ]es A]gues d'eau douce nous a obligd 5~ dtudier les divers types de classification des algues bleues afin de choisir le syst~me qui nous semble devoir ~tre pr6f6rd et serrer de plus pros la r~alit6. Les crit~res qui permettent de reconnaltre et de elasser ces organismes sont beaucoup moins nombreux que pour les autres grands groupes d'algues. Forme des eellules et dimensions, organisation des thalles, mode de reproduction sont les seuls earaetgres qui, par leur constance, soient utilisables. C'est peu si l'on compare ce maigre butin 5~ eelui des autres phylums off interviennent les diversitds de ehlorophylle et de pigments, les rdserves, la structure des plastes, celles des flagelles, le cycle vital et l'6tude des modes de reproduction vdgdtative ou sexude. Parmi les tr~s nombreux travaux consacrds aux algues bleues on peut reconnaltre trois tendances: 1 ~ une tendance 5, la ((pulvdrisatiom)

A study onPhacus smulkowskianus (Euglenophyceae)— a rarely reported taxon found in waters of the Botanic Garden Berlin-Dahlem

“…1, fig. 3), which is therefore considered a synonym. In comparison with the drawings of Christen (1962), the occurrence of more (Bourrelly 1963) or less twisted cells (Wawrik 1979(Wawrik , 1981 was observed. Fig.…”

“…Since then, euglenoids very similar to Christen's findings were found occasionally in different water bodies throughout the world: in ponds of 'Waldviertel' and in lake 'Neusiedler See' in Austria (Wawrik 1979, 1982, Kusel-Fetzmann & Schagerl 1992, in Lake Trummen in Sweden (Cronberg 1982), as well as in bogs and a lake in Argentina (Tracanna 1985, Tell & Conforti 1986, Conforti & Tell 1988. Morphological deviations from Christen's taxon were noticed in material from ponds in Austria (Wawrik 1979(Wawrik , 1981 and France (Bourrelly 1963), and were formally recognized at infraspecific rank for specimens from a French swamp (Bourrelly & Couté 1978). Christen (1962) compares Phacus similis with Ph.…”

Hassallia littoralis sp. nov. (Cyanobacteria, Microchaetaceae) from Mexico’s marine supralittoral based on morphological and molecular evidence

“…Even Hassallia and Coleodesmium have not been accepted in some identification manuals (Komárek et al 2012), for instance Starmach (1966) included several species of Hassallia within Tolypothrix, and similar criteria were used by Bourrelly (1969Bourrelly ( , 1970. Similar morphotypes of Hassallia have been sometimes identified as members of genus Tolypothrix, such as T. bouteillei (Brébisson & Desmazières ex Bornet & Flahault) Lemmermann (1910: 219), which was recently included within genus Hassallia (Komárek et al 2012) and has been recorded as the marine Hassallia bouteillei Brébisson & Desmazières ex Bornet & Flahault (1886-1888 by Bárbara et al (2005).…”