摘要: While algal taxonomy as a whole has been subject to much change in later years, the system of Pascher (1914) is still rather closely followed by most authors far classes go. The way subdividing them, well that grouping them together, may vary. But very concept an class unchanged, demanding considerable uniformity with regard chemical and cyto-logical features type monadoid cells, while allowing for unlimited variation thallus construction, disregarding whether prevailing vegetative condition motile or nonmotile cells.