"bladder fern" meaning in English

{
  "forms": [
    {
      "form": "bladder ferns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bladder fern (plural bladder ferns)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Welsh translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Ferns",
          "orig": "en:Ferns",
          "parents": [
            "Spore plants",
            "Plants",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Any of the genus Cystopteris of ferns in the family Cystopteridaceae."
      ],
      "id": "en-bladder_fern-en-noun-XNcOQBQ8",
      "links": [
        [
          "genus",
          "genus"
        ],
        [
          "Cystopteris",
          "Cystopteris#Translingual"
        ],
        [
          "fern",
          "fern"
        ],
        [
          "family",
          "family"
        ]
      ]
    }
  ],
  "word": "bladder fern"
}

{
  "forms": [
    {
      "form": "bladder ferns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "bladder fern (plural bladder ferns)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries using missing taxonomic name (family)",
        "Terms with Finnish translations",
        "Terms with Welsh translations",
        "en:Ferns"
      ],
      "glosses": [
        "Any of the genus Cystopteris of ferns in the family Cystopteridaceae."
      ],
      "links": [
        [
          "genus",
          "genus"
        ],
        [
          "Cystopteris",
          "Cystopteris#Translingual"
        ],
        [
          "fern",
          "fern"
        ],
        [
          "family",
          "family"
        ]
      ]
    }
  ],
  "word": "bladder fern"
}