Christmas fern indusium. Scientific name: Polystichum acrosticoides. Abstract micrograph at 200x with polarization. The idusium is a flap of leaf tissue that covers the cluster of sporangia on a fern leaf known as a sorus. Under this umbrella, the sporangia make and release spores, which propagate the plant. Spores grow into gametophytes, which produce sporophytes by sexual reproduction. The indus
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