27-11-2025 15:41
Thomas LæssøeSpores brownish, typically 4-celled; 26.8 x 2.4;
27-11-2025 12:01
Thomas Læssøehttps://svampe.databasen.org/observations/10496727
27-11-2025 11:46
Thomas Læssøehttps://svampe.databasen.org/observations/10493918
27-11-2025 11:31
Thomas LæssøeCollectors notes: Immersed ascomata, erumpent thro
23-09-2025 13:31
Thomas Læssøehttps://svampe.databasen.org/observations/10534623
25-11-2025 14:24
Thomas Læssøehttps://svampe.databasen.org/observations/10490522
26-11-2025 18:13
Jason Karakehian
The entire run of Mycotaxon is now available throu
25-11-2025 11:03
Mick PeerdemanHi all,One of my earliest microscopy attempts, so
Hi,May be somebody more experienced can help me. Is it possible that these pictures show Kretzschmaria deusta in a not yet mature (black) state? I know only bright whitish-gray anamorph form and completely black stoma. I've never seen something in between. Some pictures of stromatal surface like in
http://mycology.sinica.edu.tw/Xylariaceae/frames.asp?qrySectionName=Kretzschmaria&qryIDString=k004&qryPart=t
may give some hope? Unfortunately I have no pictures of section of stroma or microscopy.
Found on large Fagus sylvatica trunk (cut surface, not on bark)
Thanks for your response.
Amadej
I pressume these are stromata of Annulohypoxylon cohaerens
in my opinion isn't Kretschmaria, but a Hypoxylon (serpens ?).
Greetings Peter.
I would say it is neither Kretzschmaria (definitely) nor Nemania serpens (also definitely). It could well be Annulohypoxylon cohaerens as Enrique says but I would not exclude Hypoxylon spec., e.g. H. fragiforme. In this (quite unripe) stage it is quite difficult to say much without using KOH - the colour of the soluble pigments would help!
Regards from Lothar
Best!
cheers
Hello together,
yes, the papillate ostioli are a clear sign.
But - A. cohaerens and H. fragiforme often grow together and - especially on the front face of lying logs - H. fragiforme and A. cohaerens can look very similar in first appearance at first glance. They commonly grow together there and if they are still unripe and young (without ostioli) it is often quite impossible to say without KOH which one is developing. They also grow together on the bark where A. cohaerens is very common, too, like H. fragiforme on bare wood.
Best regards, Lothar
Warmest regards
Amadej
It is A. cohaerens - the perithecia are papillate (I overlooked this first).
But H. fragiforme (and possibly other Hypoxylon species) can look very similar by first glance.
Best regards from Lothar