The hard haematite is occasionally cut and polished as an ornamental stone, and certain kinds have been made into beads simulating black pearls.
In Iridaea the thallus is an entire lamina; in Callophyllis a lobed lamina; in Delesseria it is provided with midrib and veins, simulating the appearance of a leaf of the higher plants; in Constantinea the axis remains cylindrical, and the lateral branches assume the form of leaves.
In Coleochaetaceae the branches are often welded into nexion with each whorl there arise, singly or in pairs, branches which a plate, simulating a parenchyma.
Hispidus), oryzonzys, Rhithrodontomys (with grooved incisors), Ichthyomys and Anotomys (fish-eating, aquatic forms, from the mountains of South America), Acodon, and the North American wood-rats, or Neotonza, in which the molars have a structure simulating that of the under-mentioned Microtinae.
Thus the artificial lakes and hills, the stones forming rockeries or simulating solitary crags, the trees and even the bushes are all selected or manipulated so as to fall congruously into the general scheme.