Other view... One day later.

LAst view...

spores in H2O

Hi Yannick

no, its of the calyculus group. In a broad sense it is calyculus. I found this frequently when in the alps. I think it is H. subferrugineus, a name referring to the colour change from whitish to red-brown due ti the VBs. The spores are shorter than in calyculus.

On the DVD HB 3118 could be conspecific although more yellow and at 400 m alt. The type is HB 5984, by Nylander.

Here I attach an example from Luzern, on Corylus.

Zotto

Thank's a lot Zotto.

So table 1 in Declercq's key. But for H. calyculus, spores must be scutuloid ? It's not clear for me. In my picture, I don't see scutuloid spores. I saw all of them rounded at each side.
What is your opinion about that ?

Here are new pictures, one week later in the fridge...

Yannick

Other pict

Last one !

you are right, it is hardly visible that they are scutuloid. But look at my photo, the upper spore end is somewhat asymmetrical, and that is not seen from any view. make a test and try to find out the upper and lower end of the spores. If this is possible in many spores they are scutuloid.

In H. conscriptus it is similar, and this taxon is only tentatively different from subferrugineus.

Zotto

So yes, they are scutuloid as you said.
H. conscriptus could be a good candidate, but here, are spores not too wide ?

Considering that the guttules of my spores does not exceed 1 um of diameter, I shall tilt rather for H. conscriptus.
Except for the diameter of guttules, is there really a difference between H. conscriptus and H. calyculus ?

Yannick

Don't ask me so difficult questions :-( Originally I was convinced that calyculus (mainly on Alnus) and consriptus (?only on Salix) are easy to distinguish by spore size and oil drop size. But I was unaware of these montane forms which i now identified as subferrugineus and which are somewhat intermediate. There is also some variation in typical calyculus and conscritpus. Long ago I wrote a paper about that, i.e. a part of the paper on H. menthae and macroguttatus, which is still unpublished. I fear that the present version does not yet contain all of my latest results, and I must first work through this all to be able to give any comments. So I finally cannot fully reject Dennis' statement who wrote that he tried in vain to separate between calyculus from conscriptus over many years.

The only thing that helps is to make as many documentations of collections as possible. So if yu have the chance please make more microphotos of your spores.

Zotto

I'll do it !
Thank's a lot again.
Yannick