Scotiellopsis

Coelastrella is a genus of green algae in the family Scenedesmaceae. It is currently classified in the subfamily Coelastroideae. Coelastrella consists of solitary cells or clusters of a few cells. Cells are spherical to ellipsoidal or lemon-shaped, and are surrounded by a hyaline or brownish cell wall with 4 to 40 longitudinal striations. Cells contain numerous conspicuous vacuoles. Each cell contains one nucleus and a single parietal chloroplast, each with one pyrenoid. When mature, cultures may form a deep red color due to the presence of pigments in the cells. A distinctive identifying feature of Coelastrella are the longitudinal striations on the cell walls. These are often only visible under scanning electron microscopy (SEM). Due to the scarcity of morphological characteristics visible under light microscopy, species of this genus have generally been overlooked. Coelastrella reproduces asexually by the formation of autospores, which are released by a tear in the mother cell wall.......read more on Wikipedia.