How to float Riccia?

plastic mesh?

 

Hair nets are an old favorite for meshing things down; why not containment?

Congrats on the promotion BTW.

 

I don't mean to respond to a really old topic, but I was doing some Riccia research on the site and thought my comment may be of use to someone like myself:

I use Bird Block. You can find it at Home Depot or Lowes for like $8 a roll. It has wider openings in the mesh/netting so it can still hold the Riccia together, while allowing it to spread over and through the gaps. I just use fishing line to tie everything off underneath.

 

A piece of foam works too. It floats and sections off where the riccia floats. The riccia then mats on its own (assuming you want a floating mat like the long ago OP). Alternatively, you could get a piece of styrofoam and cut a hole the size and shape of your desired mat. Drop it in, fill it with riccia, and let it go.