portrait

Description:

Micrasterias rotata (GREV.) RALFS  Length: 200 – 300 µm, width: 200 – 270 µm.   This specie is very tolerant concerning living conditions. Therefore the species is widely spread in all altitudes, in forestal ditches and lowland fens sometimes abundant. The cells are 1.08 to 1.15 times longer than wide, the shape seems almost circular or wide elliptical. The cell is devided into lobes due to deep cuts, the terminations of lobes are denticulated. The central lobe is broadened evenly at the end. The termination is formed concavely and is lightly arched upwards at both sides. The lateral angles of the central lobe are little denticulated. The cut in the middle of the cell (sinus) is very deep and peripherally a little widened. The cellwall is densly punctuated by tiny pores. The Chromatophores have several scattered pyrenoids with varying sizes.