Stream macroalgae of Hawai`i: an identification guide - Hawaii.gov
Stream macroalgae of Hawai`i: an identification guide - Hawaii.gov
Stream macroalgae of Hawai`i: an identification guide - Hawaii.gov
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Calothrix<br />
Classification: Cy<strong>an</strong>obacteria (Family<br />
Rivulariaceae)<br />
General habit: pl<strong>an</strong>ts either growing individually or<br />
clustered in tufts or mats (sometimes in a starshaped<br />
formation), c<strong>an</strong> grow on rock surfaces or<br />
epiphytically on other algae or pl<strong>an</strong>ts<br />
Species in Hawai‘i: C. braunii, C. fusca<br />
Isl<strong>an</strong>d distribution: Necker, O‘ahu, Maui<br />
Distinguishing features: Filaments taper from the<br />
base (which usually ends in a heterocyst; Figs C, D)<br />
to a fine point at the distal end, cells shorter th<strong>an</strong><br />
wide in the lower regions <strong>of</strong> the filament <strong>an</strong>d<br />
gradually becoming longer th<strong>an</strong> wide toward the tips<br />
Compare with: Scytonema, Tolypothrix<br />
10<br />
A. An epilithic tuft <strong>of</strong> Calothrix. Scale bar = 1mm.<br />
B. View <strong>of</strong> several filaments under a compound<br />
microscope. Scale bar = 25µm. C, D. Individual<br />
filaments <strong>of</strong> Calothrix illustrating tapering <strong>of</strong> the<br />
filaments <strong>an</strong>d heterocysts at the ends. Scale bar =<br />
25µm.
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