How Big is a Fungus?

What do we think when we see the word ‘Fungus’ – what does it conjure up ?
When we’re very young, perhaps we were told that Fairies live under them. Later, in stories they are always portrayed as being poisonous – and this one actually is.
Whatever we were told when we were introduced to them, I’m sure that most people think of them as upright stalks with a round top – like the one in the picture.
