David Hershey schreef
The term spicule is applied to the skeletons of sponges:

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According to Harris & Harris it is also used for a small spike in plants, an
outgrowth of the epidermis
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mel turner schreef
Where did the fern come from? What does it look like?

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Obviously these three pictures are from a directory that showcases pictures
made by Nikon equipment. Apparently it of US origin. Beyond that it will be
anybody's guess
PvR