Abstract
In Chapter 12 we dwelt on a biochemical clock in an ascomycete, the yeast cell. The familiar bread molds and their relatives are also ascomycetes. They are called colonial ascomycetes because of their habits of growth. Like plants, they grow where the seed falls and feed through roots. An ascomycete colony starts when a spore falls on a food surface. It germinates and extends a fine web of hair-like filaments, called hyphae, across the food as an expandinh disk. This two-dimensional disk of hyphae is called a mycelium. It is not really a cellular organism since the septa dividing hyphae onto tiny compartments typically have holes in them, so that cytoplasm flows freely between the compartments.
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