Vessels
In the vascular system of vascular plants (i.e., the flowering plants and higher Cryptogams), Vessels are found plentifully; but they do not occur in any groups of plants lower than the Ferns and their allies, though the laticiferous cells of a few Fungi are a good deal like them in appearance. Vessels may be grouped as follows: 1. True Vessels, being those of the fibro-vascular bundles, which compose the vascular system. These comprise (a)