I could not find the spore size. H. caudatus agg. I agree. 0

o.k., I think this fits one of the interpretations of H. caudatus.

Merci !

Hi Bernard
I am not sure that a restudy of the type would not clarify the matter. maybe the oil content and shape & size of the spores would make it easier to select an epitype.

Did White restudy the type?

Zotto

I am sorry to interfere in the discussion but recently I found a Hymenoscyphus whose features only fit into H. caudatus?
For the first time in his case I am dealing with yellow fruitbodies. The substrate is also not typical ???
What do you think about this collection?
Mirek

The group around H. caudatus and H. fructigenus is very complex. The characters are few, and I can only see good species in a few cases, such as maybe on Carpinus fruits or typical H. caudatus with low-refractive VBs as Bernard pointed out. In your fungus I assume the Vbs in the paraphyses were strongly refractive, but now they are distorted. 

Only a molecular study combined with careful vital study will clarify this jungle. I think sequences for typical H. caudatus and H. fructigenus that could serve as a reference are so far lacking, as the avaiable sequences are not conform.

I looked in White 1943 and see that he studied several types of synonyms of H. caudatus but not that of Karsten, but he did not illustrate these types (his Fig. 8 is of little use and I cannot find which collection it belongs). White saw no clear differences even to H. scutula, but kept H. caudatus as distinct for the time being.