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Li - Dynamic Form in Nature

28 29 lIchenIform lichen lichenlike growth The flat encrustations of lichen, that ancient coloniser of rocks, trees and old walls, are familiar to all. Its formative habits are appropriately simple for such a humble plant, but the general, cumulative effect of successive layers of growth can be delightfully complex below. Emanating from centres, receding from these centres, occasionally forming bounderies with its neighbours, frequently overlapping them, lichen are the beautifiers of bare, inhospitable surfaces. Some aspects of lichen growthpatterns the fractalline advance and deference towards adjacent perimeters is reflected in certain chemical reactions, as in the formation of crusts of gallium oxide opposite. It is interesting here, that a fracturelike network is created.
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