Phycology جلبک شناسی

نخستین پایگاه اطلاعاتی جلبک شناسی به زبان فارسی

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.

Distribution Northern Territory; or South Australia; or Queensland; or New South Wales; or Victoria.

Classification: Division Chlorophyta (Green Algae).

Classification: Class Chlorophyceae.

Classification: Family Scenedesmaceae.

Reference Smith (1950: 275), Entwisle et al. (1997:32), Whitford et al. (1973:55), Dillard (1999:108), Prescott (1951:281), Ling et al. (2000:106), Day et al. (1995:170), Entwisle et al. (1999c).

  
نویسنده : رضا رمضان نژاد قادی ; ساعت ۱٠:۳۱ ‎ق.ظ روز یکشنبه ۱٢ آبان ۱۳۸٧