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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Batrachospermum<br />
Classification: Rhodophyta (Family<br />
Batrachospermaceae)<br />
General habit: usually found in faster-flowing areas<br />
<strong>of</strong> streams, greenish-gray in color, pl<strong>an</strong>t body<br />
enclosed in a s<strong>of</strong>t mucilage<br />
Species in Hawai‘i: B. spermatiophorum,<br />
Batrachospermum spp.<br />
Isl<strong>an</strong>d distribution: O‘ahu, Maui, Hawai‘i<br />
Distinguishing features: typically found in swifter<br />
flowing areas <strong>of</strong> streams, also in shadier stream<br />
regions, br<strong>an</strong>ched (whorled) filaments, attached,<br />
whorls present along the main axis <strong>of</strong> the pl<strong>an</strong>t,<br />
sexual reproduction through fertilization <strong>of</strong><br />
carpogonia by spermatia (Fig. D)<br />
Compare with: Chara, Cloniophora<br />
38<br />
A. Batrachospermum pl<strong>an</strong>t viewed under a dissecting<br />
microscope. Scale bar = 1mm. B. Compound<br />
microscope view <strong>of</strong> the axis <strong>of</strong> a pl<strong>an</strong>t, with<br />
lateral whorls <strong>of</strong> filaments. Scale bar = 400µm. C.<br />
Closer view <strong>of</strong> a main axis showing the br<strong>an</strong>ched<br />
filaments <strong>of</strong> the whorls. Scale bar = 100µm. D. A<br />
fertilized carpogonium (female reproductive structure)<br />
extending from the lower side <strong>of</strong> the center<br />
whorl. Scale bar = 50µm.
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