Phycology جلبک شناسی

نخستین پایگاه اطلاعاتی جلبک شناسی به زبان فارسی

Actinastrum

Actinastrum

 

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? Absent.

 

Filament: Branching type not recorded.

 

Filaments in bundles? not recorded.

 

Filament: Cell arrangement cells abutting.

 

Filament: Filament diameter not recorded.

 

Cell: Individual cell shape spindle-shaped.

 

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 15–24 µm.

 

Cell: Cell diameter 2–3 µm.

 

Cell: How many pyrenoids per plastid? 1.

 

Cell: How many plastids? 1.

 

Cell: Plastid shape? discoid or plate-like.

 

Cell: Position of plastid in cell? 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 2-4.

 

Colony: Shape of colony? not recorded.

 

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 Scenedesmaceae.

 

 

 

 

 

  
نویسنده : رضا رمضان نژاد قادی ; ساعت ٦:۳٥ ‎ب.ظ روز چهارشنبه ٢٧ دی ۱۳۸٥