Caption: Riccia cavernosa (Cavernous Crystalwort / Sponswatervorkje)
Photographer: Bas Kers
Locality: Ouddorp, South Holland, Netherlands (51.825633, 3.940486)
Notes: <ahref='http://www.eol.org/pages/599015' rel='nofollow'>www.eol.org/pages/599015</a>