Phycology جلبک شناسی

نخستین پایگاه اطلاعاتی جلبک شناسی به زبان فارسی

معرفی جنس Asterococcus

جنس  Asterococcus


General appearance of alga? Non-motile microalgae (single cells); or Soft or firm colony (many cells or filaments). Colour: green. Habitat: freshwater. Aquatic type: lake; or pond. Free-living or attached: free-living. Motile: Not motile. Is mucilage or gelatinous material present: Mucilage present in obvious concentric rings around each cell or group of cells in the colony.; or Mucilage present but not stratified. Filament: Branching type not recorded. Filaments in bundles: not recorded. Filament: Cell arrangement not recorded. Filament: Filament diameter not recorded. Cell: Individual cell shape globose or spherical. Cell: Is there a median constriction (isthmus)? Absent. Cell: Do the cells bear spines or cellular extensions? Absent. Cell: How many flagella per cell? Absent. Cell: Is a red eyespot conspicuous? no. Cell: Heterocytes absent. Cell: Akinetes absent. Cell: Cell length 10–35 µm. Cell: Cell diameter 10–35 µm. Cell: How many pyrenoids per plastid? 1. Cell: How many plastids? 1. Cell: Plastid shape? star-shaped; or lobed. Cell: Position of plastid in cell? Axial; or Parietal. Colony: Are remnants of the mother cell wall present or is the entire mother cell wall persistent? Mother cell wall absent. Colony: cell arrangement Cells in groups of 2; or Cells in groups of 2-4; or Cells in groups greater than 4 cells. Colony: Shape of colony? Globose to spherical. Colony: Are cells or groups of cells connected by mucilaginous threads? No. Colony: Cells in one layer or throughout throughout colony. Capable of forming blooms? Not observed. Classification: Division Chlorophyta (Green Algae). Classification: Class Chlorophyceae. Classification: Family Gloeocystaceae.


نویسنده : رضا رمضان نژاد قادی ; ساعت ۱٢:٥۸ ‎ب.ظ روز دوشنبه ٥ فروردین ۱۳۸٧