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Fine Structure of the Zoospores and Thallus of Blidingia minima

Joel A. Swanson and Gary L. Floyd
Transactions of the American Microscopical Society
Vol. 97, No. 4 (Oct., 1978), pp. 549-558
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3226170
Stable URL: http://www.jstor.org/stable/3226170
Page Count: 10
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Fine Structure of the Zoospores and Thallus of Blidingia minima
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Abstract

The thallus and zoospores of Blidingia minima (Nägeli ex Kützing) Kylin var. minima were examined by scanning and transmission electron microscopy. Thalli are monostromatic with thick, fibrous cell walls. The basal disc of the thallus is composed of elongate cells, surrounded by a thinner wall and a loose, fibrous matrix. The quadriflagellated zoospores are ovoid, naked, and lack an eyespot. A single chloroplast occupies a posterior position and contains one pyrenoid, which is ovate, surrounded by starch and divided medially by a single thylakoid. The nucleus is often surrounded by multilayered rough endoplasmic reticulum. Mitochondria contain notably long and wide cristae. The four flagella and basal bodies are cruciately arranged. Cytoplasmic microtubules line the zoospore perimeter, radiating from a region of four cruciately arranged narrow bands or rootlets. Prior to settling, zoospores retract their flagella by fusion of the plasmalemma with the flagellar membrane. A comparison of the ultrastructural features of B. minima is made with other members of the Ulvales.

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