Lots of Turf Mottlegills around

There are not many grassland fungi around at this time of yeat but we do have Turf Mottlegills (Panaeolus fimicola) fruiting. They are a dung-based fungi but I have no idea whether it is the rabbit dung or the deer dung that gets them going. They appear similar to the Brown Mottlegill (Panaeolina foenisecii) but the Turf Mottlegills have a black spore print rather than a very dark brown one and there are differences in the spores.