cystoderma? and myxo's

[diggleken]

help with these three much appreciated please.
Slime mould on rotting old stump - Arcyria incarnata or denudata?

mould on stem of meadowsweet

and this in mixed woodland, spore print white, scaly sort of stem below clear ring mark, adnate ish white/cream gills, no unusual smell, cap about 4'' across - Cystoderma spp?

Cheers
Ken

[NickCantle]

Hi Ken,

The last one (providing the top of the cap is orange/tan) looks more like Amanita fulva. Cystoderma amianthinum is a very small species, usually no larger than 2-3 inches tall.

Nick

[diggleken]

Originally Posted by NickCantle

Hi Ken,

The last one (providing the top of the cap is orange/tan) looks more like Amanita fulva. Cystoderma amianthinum is a very small species, usually no larger than 2-3 inches tall.

Nick

Hi Nick, how the devil are you? - long time no see!
Amanita was my first guess, but , as ever, I talked myself out of it - yes, it was a tan cap and it all fits beautifully into A. fulva.
Dope I am.
Thanks a lot, thats grand.
Ken
Now for the myxo's...................

[Chris Yeates]

I strongly suspect denudata: the trick is to blow across the fruitbodies (doesn't need to be excessive) if the capillitium (network) blows away easily it's incarnata; otherwise denudata

mould on stem of meadowsweet

Podosphaera spiraeae : used to be called Sphaerotheca spiraeae - this heavy infection, often stunting the upper parts of the plants, is very typical - you can see the dark cleistothecia (which will contain the asci and their spores) developing - this could have gone on the plant parasites sticky

cheers

Chris

[SheffieldLass]

Originally Posted by Chris Yeates

mould on stem of meadowsweet

Podosphaera spiraeae : used to be called Sphaerotheca spiraeae - this heavy infection, often stunting the upper parts of the plants, is very typical - you can see the dark cleistothecia (which will contain the asci and their spores) developing - this could have gone on the plant parasites sticky

cheers

Chris

Was this what we were supposed to be looking for on the meadowsweet in Dalby Forest?

Melanie

[Chris Yeates]

Originally Posted by SheffieldLass

Was this what we were supposed to be looking for on the meadowsweet in Dalby Forest?

Melanie

No - this is a very common fungus: the one I was keen to re-find was a smut, which galls the petioles - at the points of infection black spore masses erupt (if you look carefully you can see that there is also infection by the fairly common rust fungus Triphragmium ulmariae (orange spots) (*)

this is what it looks like:


and this is the national distribution:
NBN Gateway: Urocystis filipendulae grid map

you have to mentally add dots for Wiltshire, Forfar and Dalby (I'm not sure why the latter doesn't feature, but we're in the process of tightening up the Yorkshire records on FRDBI, so it'll get sorted), but that is the sum of current records - which was why I was keen to find it again - I'd like to get some images of the spores

(*) Fungal Plant Parasites

cheers

Chris

[diggleken]

Originally Posted by Chris Yeates

I strongly suspect denudata: the trick is to blow across the fruitbodies (doesn't need to be excessive) if the capillitium (network) blows away easily it's incarnata; otherwise denudata

mould on stem of meadowsweet

Podosphaera spiraeae : used to be called Sphaerotheca spiraeae - this heavy infection, often stunting the upper parts of the plants, is very typical - you can see the dark cleistothecia (which will contain the asci and their spores) developing - this could have gone on the plant parasites sticky

cheers

Chris

Thanks Chris,
so denudata blows away less easily than incarnata, I'll have to remember that - its opposite of what you would expect, with the name denudata and all that................!!!
I still have a fragment of the wood, so I'll see if they are still showing to try the test.
Podosphaera spiraeae is another new one for me, common or not, so quite pleased with that too on my voyage of discovery.
cheers
Ken