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Morphology and Growth Habit of Terpsinoe musica Ehr. (Bacillariophyceae)

Mark R. Luttenton, Lois A. Pfiester and Peter Timpano
Castanea
Vol. 51, No. 3 (Sep., 1986), pp. 175-182
Published by: Allen Press on behalf of the Southern Appalachian Botanical Society
Stable URL: http://www.jstor.org/stable/4033384
Page Count: 8
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Morphology and Growth Habit of Terpsinoe musica Ehr. (Bacillariophyceae)
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Abstract

Terpsinoe musica is a euryhaline diatom species of infrequent occurrence. Inland reports of this taxon are generally limited to isolated springs and river sections; however, taken together with marine populations its ecological range broadens considerably. Terpsinoe musica was observed forming brown flocculant masses on submerged branches and roots and was infrequently found on other substrates in the outflow stream of a constantly flowing spring in southcentral Oklahoma. Mucilage secretion from apical pore fields maintained attachment to substrates and a filamentous growth habit. Populations exhibited a large degree of variation in cell length, whereas width varied only slightly. Reduced length corresponds to increased polymorphism in valve outline. Features of the valve include a single labiate process near the central region, and irregularly arranged pores on the valve face. Terpsinoe musica may provide a model for examining genetic variation within species with populations that are morphologically similar, but have restricted distributions.

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