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"Cellular tissue from leaf of Urostigma elasticum. c, a large cell; r, cystolith, an agglomeration of crystals situated at the extremity of an inward prolongation of the cell-wall, t; u, cells filled with chlorophyll granules." — Encyclopedia Britanica, 1893

Urostigma Elasticum

"Cellular tissue from leaf of Urostigma elasticum. c, a large cell; r, cystolith, an agglomeration of…

"Cross section of a portion of leaf of Ficus elastica showing the multiple epidermis from e to a inclusive; c, cystolith; b, palisade parenchyma; d, spongy parenchyma." -Stevens, 1916

F. Elastica Epidermis

"Cross section of a portion of leaf of Ficus elastica showing the multiple epidermis from e to a inclusive;…

"Cystoliths from the leaf of Ficus carica. A, complete cystolith; B, cystolith from which the calcium carbonate has been removed for use in other parts of the plant. B is from a leaf that had fallen off in autumn." -Stevens, 1916

Cystoliths

"Cystoliths from the leaf of Ficus carica. A, complete cystolith; B, cystolith from which the calcium…