It looks like it is possibly a <"leafy liverwort">. If it is, it should have a a smaller "leaf" under the large "leaf".It’s grown quite well and I wondered what it is.
It is back to the <"same issues with naming">. The moss sold for aquariums, as "Amblystegium serpens", probably isn't <"Amblystegium serpens"> etc.Looks like Amblystegium serpens to me
This one is another "leafy liverwort", again we aren't really in a position to say whether the plant sold as <"Solenostoma tetragonum"> is really that species, but S. tetragonum is also found on Borneo, growing with Bucephalandra spp.Solenostoma Tetragonum
Moss spores germinate to form an alga-like filamentous structure called the protonema.