Home / Chrysophyceae / Colonial / Non-flagellated / Thallochrysis
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Name derivation:
Classification:
Thallochrysis W.Conrad 1914; 2 of 2 species descriptions are currently accepted taxonomically (Guiry and Guiry 2014). Type species: T. pascheri. Order Thallochrysidales; Family Thallochrysidaceae Bob Andersen thinks that Thallochrysis littoralis Anand is a stage in the life cycle of Chrysotila stipitata (haptophyceae or coccolithophyceae. order Isochrysidales) after a recent investigation from the type locality in England (personal communication and a manuscript in review (March 2014). However, he also notes that no haptophyte is uniflagellate. Is the base of a second non-emergent flagellum present?
Morphology:
Small brown flakes macroscopically. Examined microscopically the organization of the thallus includes irregularly hollow aggregates, sometimes branched along the three dimensions of space. Cells rectangular or polygonal, sometimes more or less rounded, 10 – 18 µm long and 7 - 15 µm wide, with a thick membrane, likely not cellulose. Reproduction by cell division and formation of multiseriate ‘fronds’, as well as by production of uniflagellate zoospores with apical insertion of flagellum. Palmelloid stages can be produced by zoospores (Conrad 1914) as reviewed by Pascher (1925).
Similar genera:
Phaeodermatium found by Lund in a stream near his home in England (Andersen, personal communication).
Habitat:
References:
Andersen. R.A. (personal communication). Friday Harbor Laboratories, University of Washington, Laurium, MI USA Guiry, M.D. and G.M. Guiry 2014. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 06 March 2014. Pascher, A. 1925. Die braune Algenreihe der Cbrysophyceen. Arch. Protistenk. 53, 489-564.
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