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09-08-2022 20:06

Stephen Mifsud Stephen Mifsud

I have found an interesting aspergillus on flowers

06-08-2022 22:20

Marcus Yeo

I found this ascomycete today on dead leaves of Er

16-07-2022 17:01

Zetti Mario

Hi, I am doing some work with microfungi and durin

02-08-2022 17:48

Pierre-Yves Julien

Récolte le 31/07/2022 – Ozoir-la-Ferrière (77)

06-08-2022 20:43

Louis DENY

Au bord d'un étang près de Belfort (alt 400m) su

05-08-2022 13:22

Lothar Krieglsteiner Lothar Krieglsteiner

near Snasa, on mixed lawn with Nowellia curvifolia

05-08-2022 08:43

Josep Torres Josep Torres

Hola.Un líquen sobre la corteza de un tronco de p

07-08-2022 01:57

Stefan Jakobsson

A light-coloured Hymenoscyphus growing on a cone o

13-07-2022 23:27

Josep Torres Josep Torres

Hola.Un liquen cortícola fotografiado este pasado

05-08-2022 13:58

Lothar Krieglsteiner Lothar Krieglsteiner

on decorticated branch of surely Betula (as there

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Enrique Rubio, 03-05-2019 21:38
Enrique RubioThese apothecia grew in a decorticated branch of hardwood of 10 mm thick, fallen to the ground, product of a pruning.The hymenium is dextrinoid and the ascospores are multiseptate. I think in Karstenia as a good genus for it.
What do you think?
This collection is from central Spain at 1000 m of altitude, april 6(2019).
Many thanks again
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Hans-Otto Baral, 03-05-2019 21:56
Hans-Otto Baral
Re : Karstenia?
Hi Enrique
With Karstenia I agree. It could be valuable to make a KOH-pretreatment and test in IKI or MLZ (both the same), you will get a blue hymenium (hemiamyloid, not dextrinoid!) and perhaps a small blue  apical ring becomes visible under oil immersion, depending on the species. Dextrinoid would mean red in MLZ whereas your pic clearly shows no reaction in MLZ.

Jason Karakehian, 03-05-2019 22:11
Jason Karakehian
Re : Karstenia?
Hi Enrique, do you observe longitudinal wrinkles on the ascospores at all?
Enrique Rubio, 04-05-2019 01:18
Enrique Rubio
Re : Karstenia?
No, Jason. I haven't observed any ornamentation on the spores.
Enrique Rubio, 04-05-2019 01:46
Enrique Rubio
Re : Karstenia?
From dried, not fresh material:
*Mlz. + KOH-pret. = negative
*IKI + KOH-pret. = reddish, not blue
I haven't observed any bluish apical pore.
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Hans-Otto Baral, 04-05-2019 08:37
Hans-Otto Baral
Re : Karstenia?
Sorry, but your KOH pretreatment must have been very weak. I cannot imagine that an ostropalen fungus does not turn to an I-blue reaction even if exposed to 1-2% KOH for a few seconds only.