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Pterocystis discoidea, Rote Wasser, Germany – Photomicrograph Eckhard Voelcker

Pterocystis discoidea  (Dürrschmidt, 1985)
  
Diagnosis: Periplast 10-15 µm, protoplast unknown; spine-scales circular or broad oval, 3.41-4.1 µm in diameter, dish-shaped with a broad structureless border and a central part with radiating ribs; emitted from a strongly rudimentary shaft; plate-scales relatively small, elliptical and thin 0.75 X 0.6 -1.1 µm; central rib slightly shifted to one pole.

Ecology: only known from Sphagnum and a small pond. Chile (Dürrschmidt, 1985), Germany (Eckhard Voelcker, 2014, pers. comm.)
  
Pterocystis discoidea - Ferry Siemensma

Pterocystis discoidea, a spine-scale, b plate-scale – after Siemensma, 1991

Pterocystis discoidea, Rotes Wasser, Germany – Photomicrograph Eckhard Voelcker
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