That's a bit like saying "where do the toadtools come from" - in one way they are no more the "start of the chain" than is a butterfly's egg . . . or caterpillar . . . or adult insect - the latter often living for less time than the other stages . . . see the "Life cycle" section of https://en.wikipedia.org/wiki/Erysiphales - though the whole is worth readingalindsay wrote:...but where do the chasmothecia come from, if they are the start of the chain?