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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Hydrosera<br />
Classification: Bacillariophyta (Family<br />
Biddulphiaceae)<br />
General habit: filamentous chains <strong>of</strong> cells, c<strong>an</strong> be<br />
either attached to a substrate or free-floating,<br />
appear as light brown masses <strong>of</strong> filaments that c<strong>an</strong><br />
easily be broken apart when removed from the<br />
stream, growths c<strong>an</strong> be up to m<strong>an</strong>y cm in length<br />
Species in Hawai‘i: H. whampoensis<br />
Isl<strong>an</strong>d distribution: Kaua‘i, O‘ahu, Maui, Hawai‘i<br />
Distinguishing features: cells exhibit a<br />
characteristic shape <strong>of</strong> overlapping tri<strong>an</strong>gles when<br />
in valve view (Fig. D); material should be examined<br />
in this view for positive <strong>identification</strong><br />
Compare with: Melosira, Pleurosira, Terpsinöe<br />
43<br />
A. Epiphytic filaments <strong>of</strong> Hydrosera in a stream.<br />
Scale bar = 5cm. B. Chains <strong>of</strong> cells viewed under<br />
a dissecting microscope. Scale bar = 110µm. C.<br />
View under a compound microscope <strong>of</strong> a<br />
Hydrosera chain. Scale bar = 50µm. D. Valve view<br />
<strong>of</strong> a Hydrosera cell. Scale bar = 25µm.
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