Vadim S

Last year, found among other plants from Southeast Asia,
light green color and has white roots. The photo shows part of the plant (emerse) and about 4in. long stems, growing under water (submerse).



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Yo-han

Maybe Utricularia minor...

Vadim S

thanks,
but doubtfully

miremonster

IMO it's a Selaginella of some kind. Interesting to see how thin submersed stems are grown from the emersed ones.
Species ID might be very difficult, but SE Asia may be a valuable information. There are many Selaginella species worldwide, mainly tropical/subtropical. Surely only emersed plants can be IDed because the submersed ones look untypical.

Vadim S

thanks Heiko,
but I did not know that Selaginella may have white roots.

miremonster

Here's a pic with Selaginella roots: http://mundani-garden.blogspot.de/20...moss-fern.html (the shown species S. denticulata occurs in the Mediterranean area, not in SE Asia)
Roots of e.g. Selaginella kraussiana, often cultivated as ornamental, look alike.

Vadim S

thanks, very similar.

miremonster

Is the growth of the submersed stems erect or rather creeping? I wonder if the submersed stems always grow that thin, or if they get denser and broader, i.e. more similar to the terrestrial stems, with increased light/nutrient/CO2 supply.