Question

What are the black spots on the ferns of the leaf called

Answer 1

Individual spores are encased in structures called sporangia, which are the dots that appear on the underside of fern fronds. The sporangia have caps called indusia that contain the spores until they reach maturity. When the indusia burst open, they propel the spores forcefully from fern plants.

Answer 2

Answer:

Boston Fern Fronds Turning Black Isn't Always Bad

You may see small black spots on the undersides of your fern's leaves

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