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Home / Chlorophyceae / Filamentous / Unbranched / Oedogonium / Images |
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Oedogonium
(Chlorophyceae) |
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Oedogonium sp. showing multiple
chloroplasts, starch-forming bodies (pyrenoids), and cell division rings.
Modified from an image at nifty.com |
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Oedogonium sp. trichome
with multiple cell division rings. Modified from an image at nifty.com |
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Oedogoniuim sp. with cell division
rings. Modified from an image at the University of Wisconsin. |
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Oedogonium sp. oogonium. Modified from
an image at the University of Wisconsin. |
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Oedogonium sp. germling. |
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Oedogonium
filament with visible sheath, punctuated at cell cross
walls. Modified image .
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Oedogonium sp. zygote. Modified from an image at the University of Wisconsin. |
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Oedogonium sp. antheridium and division
rings. Modified from an image at the University of
Wisconsin. |
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Oedogonium sp. trichomes heavily
encrusted by periodic attachment of Gomphonema
(stalked diatoms) as epiphytes on Oedogonium
trichomes. |
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Gomphonema (stalked diatoms) as epiphytes
on Oedogonium
trichome. |
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A
mass of Oedogonium
non-branching trichomes. |
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Gomphonema (stalked diatoms) as
epiphytes on Oedogonium
trichomes. |
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Gomphonema (stalked diatoms) as
epiphytes on Oedogonium
trichomes. |
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Oedogonium
'dwarf male' development from attachment (Fig. 1) through production of two
male gametes per nanandrium (Figs. 8-13) and release of gametes (Fig. 14). D’Amico,
S.L., P.I. Leonardi and E.J. Cáceres 2013. Ultrastructure of
multicellular dwarf males with external gametangium in Oedogonium macrandrium (Oedogoniales, Chlorophyta). Biocell 37(3):85-91. |
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Oedogonium sp. dwarf male attached to
female filament near oogonium (inflated cell) Zoospore released
from sporangium of the same or a different macrofilament is chemically
attracted to the oogonium and attaches to it or an adjacent somatic
cell. It produces a dwarf filament by repeated mitotic divisions, then
undergoes meiosis producing two flagellated microgametes
(‘spermatozoids’) that are released and swim to the surface of the oogonium where normally one of the gametes fertilizes the
egg, if it is successful. Polyspermy, presumably because of plasmogamy
(fusion of cell contents without fusion of nuclei, common in fungi), has been
observed in Oedogonium
(Hoffman 1973). Modified from
photograph at 'Soft-bodied stream algae of California' by Rosalina Stancheva,
Robert Sheath and Lilian Busse, University of Colorado at Boulder, posted online.
Hoffman,
L. 1973. Fertilization in Oedogonium. II.
Polyspermy.
Journal of Phycology 9:296-301. online |
Oedogonium sp. with apical rings following at least four cell divisons
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Oedogonium sp. with ~15 apical rings, from Lake Cochichewick, North Andover MA, USA
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Home / Chlorophyceae / Filamentous / Unbranched /Oedogonium / Images |
