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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Audouinella<br />
Classification: Rhodophyta (Family<br />
Acrochaetiaceae)<br />
General habit: br<strong>an</strong>ched filaments, usually present<br />
in tufts or a spreading, mat-like arr<strong>an</strong>gement, c<strong>an</strong><br />
be steel blue, gray, reddish, or purple in color,<br />
usually found in faster-flowing areas <strong>of</strong> streams,<br />
growing directly on rock surfaces or epiphytically on<br />
mosses<br />
Species in Hawai‘i: A. chalybea, A. eugenea, A.<br />
pygmaea<br />
Isl<strong>an</strong>d distribution: Kaua‘i, O‘ahu, Maui, Hawai‘i<br />
Distinguishing features: br<strong>an</strong>ched filaments,<br />
br<strong>an</strong>ches only slightly smaller in diameter th<strong>an</strong> the<br />
main axis, chloroplasts one to several per cell (platelike<br />
or ribbon-like), reproduction through rounded<br />
spores (termed monospores) produced at the tips <strong>of</strong><br />
br<strong>an</strong>ches<br />
Compare with: Cladophora<br />
37<br />
A. Audouinella pl<strong>an</strong>ts (purplish-red color) attached<br />
to mosses in a stream. Scale bar = 2cm. B.<br />
A single pl<strong>an</strong>t viewed under a dissecting microscope.<br />
Scale bar = 3mm. C. Br<strong>an</strong>ched filaments.<br />
Scale bar = 50µm. D. A series <strong>of</strong> monospor<strong>an</strong>gia<br />
produced along a filament <strong>of</strong> Audouinella. Scale<br />
bar = 30µm. E. A high magnification view <strong>of</strong> the<br />
chloroplast morphology <strong>of</strong> Audouinella. Scale bar<br />
= 30µm.
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