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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Zygnema<br />
Classification: Chlorophyta (Family<br />
Zygnemataceae)<br />
General habit: unbr<strong>an</strong>ched filaments, forming<br />
cottony masses or tufts <strong>of</strong> filaments, yellow-green to<br />
grass-green or slightly darker in color, c<strong>an</strong> develop<br />
into large pl<strong>an</strong>t masses in slower-flowing areas <strong>of</strong><br />
streams <strong>an</strong>d ponds<br />
Species in Hawai‘i: Zygnema sp.<br />
Isl<strong>an</strong>d distribution: Kaua‘i, O‘ahu, Maui, Hawai‘i<br />
Distinguishing features: unbr<strong>an</strong>ched filaments,<br />
filaments uniform in diameter along their length,<br />
each cell contains two axial, stellate chloroplasts,<br />
each with a pyrenoid (Figs D-E), sexual<br />
reproduction through conjugation <strong>of</strong> filaments <strong>an</strong>d<br />
subsequent development <strong>of</strong> zygospores (Fig. C)<br />
Compare with: Mougeotia, Oedogonium,<br />
Rhizoclonium, Spirogyra<br />
36<br />
A. Zygnema viewed under a dissecting microscope.<br />
Scale bar = 3mm. B. Aggregation <strong>of</strong> unbr<strong>an</strong>ched<br />
Zygnema filaments viewed under a<br />
compound microscope. Scale bar = 100µm. C. A<br />
filament (post conjugation) containing zygospores.<br />
Scale bar = 40µm. D, E. Chloroplast morphologies<br />
in <strong>Hawaii</strong><strong>an</strong> Zygnema. Scale bar = 30µm.
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