"The spores are very light and are easily wafted about by the gentlest breeze, so that in the fields the winds scatter the spores far and wide, and thus give an opportunity for the mushrooms to grow in fields where food and other favorable conditions are present. These spores germinate by producing a very delicate white thread which branches to form a mat of fiber like substance. Many of these little threads unite into a cord or string which is also white... This fiber like substance is known as the mycelium, though mushroom growers often speak of it as the "fiber." It can readily be seen in all good spawn."