Small white mushroom, with a tomentose covering

I am seeking help for a fungus (only 2 specimens in situ) on decaying wood (Carob branch) in a damp habitat. It was very small, with its pileus about 1 cm across and stipe 3 cm tall. Pileus (and less so the stipe) was covered with a fine felty (tomentose) coat smf the margin was finely appendiculate. The problem is that its microscopy was boring (or unsuccessful )

First of all I could not detect good spores , yet I think they are small, 3-4um rounded to broadly ellipsoid bodies. The cystidia if present are not specialised and maybe I was seeing basidiomes. The only successful microscopic feature was the pileipellis, intricate hyaline elongated parallel-running hyphae that are smooth and quite long, terminal cells unspecialised too. I think I have seen clamps in the pilepellis. (see image 8129). This is just my interpretation of what I am seeing and maybe wrong, but the physical characters might be good enough

I was wondering if at least we can give it a genus name: Cystolepiota sp.

Thanks Wolfgang. I remember it did not sporulate and when I carried out the pileipillis test I was careful to extract the outermost layer. My fault that I did not carried out a good job on the micro (Images crap!)

It us a very strange species and this year I go and search it again (know the place to go) and follow the tape-method which I like and usually I use it on Penicillium spp. and moulds! Would a diluted drop of Phloxin or Congo red help ?

Thank you,

I also have an update (to be confirmed) that I marked on my XL that I saved a ex-siccatum specimen. Maybe it is useless if they collapse but worth a try. I check your post

I have found the dried specimen (8mmin size!) and I have the following new data:

• Gills free from stipe and drying to light-brown colour
• Pilleipellis tomentose, trichoderm of sausage-shaped hyphae, sometimes with a pointed tip, clamp junctions observed
• Basidia slender and small with barely visible sterigmata, approx 20-25 um long
• Spores very small barely visible, possibly liberated in groups of 2, 3 or 4s, pip-shaped and only about 2.5 um long
• Cheilocystidia not observed, but not sure if they have been destroyed during drying/rehydration
• Pleurocystidia null

Dr Jordi Vila had hinted to be Pseudobaeospora albidula (complex) and I see a lot of similarities. Just wanted to give you an update

Paper on this species:

(PDF) Pseudobaeospora albidula (Agaricales) found in the Czech Republic

Problem is that it i so hard to find the spores and they are 2-3 um! Yet, being the type of not to surrender easily, I will giveit a try. My plan was to visit the site next month and try to find more specimens. I keep updating this finding - thanks