Southbank Equestrian, Henfield (in field). Nothing else quite like it given the combo of the cap and other features in the other photos. This is what they look like when they mature - they start out like yellow eggs, then open out and fade but often maintain a yellow centre as here. This is growing on grassland so it is a bit more spindly than the ones growing on woodchip which is apparently allowed!

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (27/10/2021) Southbank Equestrian, Henfield (in field). Nothing else quite like it given the combo of the cap and other features in the other photos. This is what they look like when they mature - they start out like yellow eggs, then open out and fade but often maintain a yellow centre as here. This is growing on grassland so it is a bit more spindly than the ones growing on woodchip which is apparently allowed!

Southbank Equestrian, Henfield (in field). And here is a younger one but a bit older than some of the more yellow and egg-shaped specimens in other photos here.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (27/10/2021) Southbank Equestrian, Henfield (in field). And here is a younger one but a bit older than some of the more yellow and egg-shaped specimens in other photos here.

Southbank Barn, Henfield (woodchip pen). This one starting to fully open, as it does so it becomes increasingly lined and as it heads towards its flattish-topped maturity. The colour will increasingly fade to pale but with a yellowish centre. As the cap dries out you often get these pocketed-vein like appearance on the top which is often quite sticky.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (02/08/2021) Southbank Barn, Henfield (woodchip pen). This one starting to fully open, as it does so it becomes increasingly lined and as it heads towards its flattish-topped maturity. The colour will increasingly fade to pale but with a yellowish centre. As the cap dries out you often get these pocketed-vein like appearance on the top which is often quite sticky.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (02/08/2021) Southbank Barn, Henfield (woodchip pen). It is tacky to the touch.

Southbank Barn, Henfield (woodchip pen). The edges become increasingly fragile-looking as the cap ages.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (02/08/2021) Southbank Barn, Henfield (woodchip pen). The edges become increasingly fragile-looking as the cap ages.

Southbank Barn, Henfield (woodchip pen). A cluster of them in various stages of maturity.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (27/06/2021) Southbank Barn, Henfield (woodchip pen). A cluster of them in various stages of maturity.

Southbank Barn, Henfield (woodchip pen). A youngter nestled amounst some even younger ones poking through the woodchip. At this age they are very yellow and also very tacky / viscous.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (27/06/2021) Southbank Barn, Henfield (woodchip pen). A youngter nestled amounst some even younger ones poking through the woodchip. At this age they are very yellow and also very tacky / viscous.

Southbank Barn, Henfield (woodchip pen). Very young ones poking out from teh woodchip pen. Interstingly there was evidence that my horse had eaten some and it actually made him sufficiently ill that we had to call the vet out! So I had to manually remove all these.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (27/06/2021) Southbank Barn, Henfield (woodchip pen). Very young ones poking out from teh woodchip pen. Interstingly there was evidence that my horse had eaten some and it actually made him sufficiently ill that we had to call the vet out! So I had to manually remove all these.

Southbank Barn, Henfield (woodchip pen). These are particularly bright-coloured youngsters in the next few images.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (02/08/2021) Southbank Barn, Henfield (woodchip pen). These are particularly bright-coloured youngsters in the next few images.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (02/08/2021) Southbank Barn, Henfield (woodchip pen). Very young specimens.

Southbank Barn, Henfield (woodchip pen). A baby one (right) and a slightly older one (left) but still immature.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (02/08/2021) Southbank Barn, Henfield (woodchip pen). A baby one (right) and a slightly older one (left) but still immature.

Southbank Barn, Henfield (woodchip pen). I don't know why these are so dark - in the lower one you can see yellow underneath the orange. I suspect these have dried out and are no longer sticky. For a while I thought this was a flame shield (Pluteus aurantiorugosus) but that is much more orange in colour.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (02/08/2021) Southbank Barn, Henfield (woodchip pen). I don't know why these are so dark - in the lower one you can see yellow underneath the orange. I suspect these have dried out and are no longer sticky. For a while I thought this was a flame shield (Pluteus aurantiorugosus) but that is much more orange in colour.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (02/08/2021) Southbank Barn, Henfield (woodchip pen).

Southbank Barn, Henfield (woodchip pen). Stem covered in white mealy powder as you can see here.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (02/08/2021) Southbank Barn, Henfield (woodchip pen). Stem covered in white mealy powder as you can see here.

Southbank Equestrian, Henfield (woodchip pen). Gills start out pale yellow and with age darken to a rusty, cinnamon-brown. The gills are narrowly attached to the stem although you can't really see that here.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (27/06/2021) Southbank Equestrian, Henfield (woodchip pen). Gills start out pale yellow and with age darken to a rusty, cinnamon-brown. The gills are narrowly attached to the stem although you can't really see that here.

Southbank Barn, Henfield (woodchip pen). This one is slightly younger than the darker gills on the previous image.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (02/08/2021) Southbank Barn, Henfield (woodchip pen). This one is slightly younger than the darker gills on the previous image.

Southbank Barn, Henfield (woodchip pen). The gills of the youngster as this one is, are a pale yellow only darkening as the cap opens up to its flatter, mature shape.

Yellow Fieldcap (Bolbitius titubans) - Family Fieldcaps (Bolbitiaceae) (27/06/2021) Southbank Barn, Henfield (woodchip pen). The gills of the youngster as this one is, are a pale yellow only darkening as the cap opens up to its flatter, mature shape.