A friend received roses, and on the back are these mysterious things. It's not everywhere, but it's behind the back of many of the leaves. Anyone know what they are?

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It is not a rose, but a fern. Fern usually have sori (https://en.wikipedia.org/wiki/Sorus), which are used to disperse spores.

Ferns have no flowers, so no seeds.

Note the white flowers come from a different plant, which is also not a rose, but I cannot identify it.

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