Phycology جلبک شناسی

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Actinotaenium

Actinotaenium

 

General appearance of alga? Non-motile microalgae (single cells).

 

Colour? green.

 

Habitat freshwater; or terrestrial.

 

Aquatic type? lake; or pond; or bogs; or puddles and ditches.

 

Free-living or attached? free-living.

 

Motile? not recorded.

 

Is mucilage or gelatinous material present? Absent.

 

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; or ellipsoid; or ovoid.

 

Cell: Is there a median constriction (isthmus)? Shallow furrow.

 

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 20–260 µm.

 

Cell: Cell diameter 7–110 µm.

 

Cell: How many pyrenoids per plastid? 2–10.

 

Cell: How many plastids? 1.

 

Cell: Plastid shape? star-shaped.

 

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 not recorded.

 

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 not recorded.

 

Capable of forming blooms? Not observed.

 

Classification: Division Chlorophyta (Green Algae).

 

Classification: Class Zygnematophyceae.

 

Classification: Family Desmidaceae.

 

 

 

 

 

 

  
نویسنده : رضا رمضان نژاد قادی ; ساعت ۱٢:۳٥ ‎ق.ظ روز دوشنبه ٢ بهمن ۱۳۸٥