- Asmallbladderlikecellorcavity.largesiphonophorehavingabladderlikefloatandstingingtentacles.Asmallbladderlikeone-seededindehiscentfruit,asintheamaranth.Anyfernofthegenuscystopterischaracterizedbyahoodedindusiumorbladderlikemembranecoveringthesori....
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