Calothrix

Cross Index	Calothrix
SuperSet	Prokaryote, Eubacteria Oxygenic Phototrophic Bacteria
Compare	Cyanobacteria Chroococcales: Chamaesiphon, Cyanothece, Gloeobacter, Gleocapsa, Gloethece, Microcystis, Myxobaktron, Synechococcus, Synechocystis Pleurocapsales Chroococcidiopsis, Dermocarpa, Dermocarpella, Myxosarcina, Pleurocapsa, Xenococcus Oscillatoriales Arthrospira, Crinalium, Lyngbya, Microcoleus, Oscillatoria, Pseudoanabaena, Spirulina, Starria, Trichodesmium Nostocales Anabaena, Aphanizamenon, Cylindrospermum, Nodularia, Nostoc, Scytonema, Calothrix Stigonematales Chlorogloepsis, Fischerella, Geitleria, Stigonema Prochlorales Procloron didemni, Prochlorothrix hollandica
Contrast	Anoxygenic Phototrophic Bacteria Archaea
Subset

Staining
Morphology
Motility
Specialized structures	Mature trichome with a tapered morphology, a basal, one-pored heterocyst, and a sheath which is open at the api cal end and is usually laminated Tapered trichomes range in diameter in their basal region from about 2.5 to 18 um, with the filaments (i.e. trichome plus sheath) sometimes reaching 30 um.

Tropism
Oxygen
pH
Temperature
Requirements
Products
Enzymes
Unique features	The principal features used to delimit the various species which have been recognized (80+) are: Trichome width Whether the basal region of trichome is swollen Whether a mature trichome ends in a colourless, multicellular hair Whether intercalary heterocysts occur in addition to the basal one Whether the mature sheath is brown or colourless Whether the trichomes are aggregated into tufts Whether akinetes are formed (C. stagnalis Gomont only).

First citation	Agardh, C.A.1824. Sysstems Algarum, Litteris Berligianus. Lund, Sweden, 312 pp
The Prokaryotes	p
Bergey's Systematatic	p 1791 B. A. Whitton
Bergey's Determinative	p 408