Compsopogon caeruleus (Balbis ex C.Agardh) Montagne 1846

    Thalli bluish green in colour grows up to 10 cm in height and 150 µm - 320 µm in width. Thalli attached by basal prostrate disc, 64 µm - 300 µm in diameter. One or two erect filaments arise from the basal disc. Thalli grow by means of apical cells, 5 µm - 18 µm in length and 6 µm - 29 µm in width.

    Thalli branch alternately or irregularly and branches arise from their bases. Width of the uniseriate filaments measure up to 50 µm, cells discoid to barrel shaped, 4 µm - 32 µm in length and 12 µm - 46 µm in width, cells contain numerous díscoid plastids. Older filaments bear 2 layered cortex; outer cortical cells 15 µm - 58 µm in diameter and inner cortical cells 30 µm - 68 µm in diameter. Axial cells measure 83 µm – 188 µm in diameter.