-
- Calothrix filaments attach to the substrate to
form
- thin mats or bristle-like
clumps, as shown above.
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- Calothrix filaments
are wider at the base, with elongated, tapered, and hair-like
apical regions.
- The vegetative cells are usually barrel-shaped,
cylindrical, or slender and elongated, but are sometimes enlarged.
-
- Firm mucous sheaths are always present, and
are clear, yellow, or brown in color. Occasionally, false branching
forms if the trichomes separate and then both continue to grow
inside the original sheath.
-
- Calothrix usually
has ellipsoidal or spherical heterocysts located at the base
of the filaments or near points of false branching. Ellipsoidal
or cylindrical akinetes sometimes develop above the heterocysts
from a vegetative part of the filament.
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