It was in late September that we first noticed them. A forest of over 120 mushrooms (or were they toadstools?) literally erupted from the ground between our place and neighbour John's. They were beautiful, maturing from bright yellow bulbs to flat topped saucers held aloft by a sturdy stalk. Some measured as much as 18 cm (7.25) inches across. We had encountered these before but never in these numbers. Another forty of them sprouted beneath the conifers lining our driveway. On walks through the bush we encountered them. What was this invasion?