Hi Marja!
the only Cistella on leaves with such spores is C. grumosa, but there the asci react red and they have no ctoziers.
Zotto

Dear Zotto,

after sending the note  it came to my mind to check your CD data. There was C. deflexa on Acer leaves with bigger spores than in Raitviirs opus, not up to 10 but close. and I saw only one spore so big others were up to 8. I even saw some, that were more swollen in the middle.  So I'm now pretty sure, that this is Cistella deflexa. Once again the species seems to be new for Finland.

Marja

But you should find some hooked hairs. I know deflexa from Populus and Salix, also Acer and Juglans.

Dear Zotto,

now I'm even more confused.

I studied something similar from the same area on Salix leaves last night and the first gave similar, but longer hairs. The second today had these spiny ones, too, but also glassy hairs up to 60! There was even a lumen at the base of the hairs-

My first impression, when I studied this Betula one was, that it is glassy haired one, but then saw the spines and turned to find the answer from Cistellas.

The hairs were now glassy after KOH 5%. I have not yet tried a redetermination on glassy ones in Raitviis revised syonopsis, but do that after this.

Maybe the hairs of the ones on Betula leaf were not mature yet.

Marja

Yes, these are glassy. But take care, these species may grow mixed!

Dear Zotto,

I have found spiny haired Hyalopeziza pygmaea in 2014 on Salix leaves and have determined it with the Revised synopsis of the Hyaloscyphaceae. If I have done that, I can not determine this to be the same. The spores are too big and asci huge compared to those mentioned in that opus. So, this may be some other spiny Hyalopeziza and I have no means to determine this. These will be placed to my herbarium as Hyalopeziza sp.

What do you mean by growing mixed? Maybe mixed species. I have found  even small Betula leaves carrying 3-5 different species (Flagelloscyphas, Typhulas, Hymenoscyphuses, Calycellinas, Venturiocistella diversipila etc)  and wars of space for living going on grasses...

The weathers here have been very moist this year, so the variety of species is partly peculiar. Some common species have been scanty or absent and some normally scanty or absent species are common, but often mouldy.

Marja

Yes, and I meant mixed cistelloid species. H. pygmaea is a goiod idea, but you say the spores are too large. You did not giev the size, but from the scale I would say 5 µm?

Dear Zotto,

you should multiply the result on the scale by 2. The magnification is mentioned on the photo text, 500x.

The asci should be only 16-20x4-5 and these have them twice as long. The sizes of the description may be from dried specimen. Still can the dimensions be so much smaller? But now, that I start to think about it, the answer must be: yes. Some substrates give much more nutrition. I have noticed big varieties in (micro and macro) sizes of for instance Hymenoscyphus kermesinus on different leaves and different moisture conditions, so it may be possible. We really have had rains here and the conditions have been great to develop big, wet spores.

Once again: Thank you Zotto!

Marja

So now I'm disaponted of not finding anything new for me ;)

o.k., 500x when knowing that at 1000x it is 1:1.

I have for pygmaea *25-33 x 6.5-7.5, but spores are indees small: *5-6 x 2-2.4 (HB 2964).

I am not so sure that size differences can be explained so easily with nutritional sources. But they occur, I recall Psilachnum chrysostigma varying between *5-6 and *6-9.

For H. pygmaea the lit gives 5-7 (probably dead state).

Zotto