As indicated already
by its name, Closterium setaceum is marked by extended, setalike cell
ends. In this feature it resembles related species like Cl. kuetzingii and Cl. rostratum. However as compared to those species, the colourless
extensions in Cl. setaceum are relatively longer, i.e. longer than the
green, inflated midregion of the cell. Zygospores of Cl. setaceum are
very characteristic, i.e., about cruciform with deeply concave sides and truncate
angles. In the Netherlands, Cl. setaceum is a rare species of acidic,
oligotrophic bogs and moorland pools. Zygospores have been encountered only
incidentally.
<< Image on the left:
Cell of Closterium
setaceum characterized by very long, colourless, beak-like cell ends and
a green, fusiform midregion.
Cell dimensions
(L x B): 370 x 10 µm |
Image © Henk Schulp
Zygospore of Closterium
setaceum (entangled in detritus). The empty gametangial cells are still
firmly attached to the truncate angles of the cruciate spore. |
