Riccia will grow out of the mat/net and it does not have roots.
So what's going to happen is that as the plant mass above the mat/net grow bigger and denser, the whole plant mass will eventually be dislodged (what's that theory: Upthrust = weight of water displaced?). This effect is quite a common 'pain' considering the fact that riccia pearls vigorously under good condition and the bubbles add to the boyancy.
It is this reason that some people classified riccia as a high-maintenance plant.








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