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Restored. a, Fruit, natural size. b, Stem, natural size. c, Scalariform tissue of the axis, highly magnified.

Scalariform, with cross-bands, resembling the steps of a ladder, 134.

Scalariform ducts of a Fern; part of a bundle, prismatic by pressure.

The scalariform vessels of these two genera are not conclusive in proving them to have a real affinity with ferns, as Mr. Brown has discovered the same structure of vessels in Myzodendron, a genus allied to the mistletoe; and Corda has lately shown that in two species of Stigmaria, hardly distinguishable by external characters, the vessels of the one are scalariform, and of the other dotted.

A slice across the stem of a tree shows many different tissues with more or less technical names, bark and cambium, medullary rays, pith, and more or less specialised tissue; air-vessels, punctate vessels, woody fibres, liber fibres, scalariform vessels, and other more or less specialised tissues.