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Fibers
Fibers can occur in aggregates forming a continuous cylinder around the stem, they may connect end to end
to form multicellular strands acting like strengthening cables exactly like re-bar in concrete, or they sometimes appear as
individual cells or small groups of cells with thick, pitted cell walls and tapered ends. Fibers are sometimes elastics and
can be stretched to a degree, but they will snap back to their original lengths.
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Sclereids
Sclereids sometimes occur as sheets (an example being the hard outer layer of some seed coats), but they usually occur
in small clusters or as solitary cells. Sclereids have many striking shapes, from elaborately branched cells, to star-shaped
cells, to the simple stone cells that give a gritty texture to pear fruits. Sclereids cell walls often are thicker than
the walls of fibers.
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