Nostoc:
Taxonomic Position and Habitat
• Class: Cyanophyceae (Blue Green
Algae)
• Order: Nostocales; Family:
Nostocaceae
• Terrestrial Aquatic habitat
• Fresh water ponds, pools, puddles
• Damp soil N.commune
• Symbiotic association with some
Plants Coralloid root Cycas, Anthoceros thallus
• Gelatinous grouping called “star
jelly” witches butter”
Thallus
structure
• Colonial, filamentous algae as
mucilaginous balls
• Filaments: uniseriate, unbranched,
beaded appearance
• 3 types of cells: Vegetative cells,
akinete and heterocyst
Cell structure
• Spherical, oval, barrel shaped cells
• Prokaryotic, two layers of mucopolysachride
• Protoplasm divided into centroplasm
and chromoplasm
• Centroplasm contains DNA
• Chromoplasm contains pigments and
thylakoids
• Reserve food: Cyanophycean strach
and cyanophycean protein granules
More on Nostoc: Heterocyst of Nostoc: Structure and Function
Reproduction in Nostoc 5 Different types
More on Nostoc: Heterocyst of Nostoc: Structure and Function
Reproduction in Nostoc 5 Different types
Tags:
Algae
Nostoc blue green algae
nostoc cell structure
nostoc habitat
nostoc microscopic view
Nostoc taxonomy