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09-08-2022 20:06

Stephen Mifsud Stephen Mifsud

I have found an interesting aspergillus on flowers

13-08-2022 17:18

Stephen Mifsud Stephen Mifsud

I assumed these are weak colonies of Neurospora on

18-08-2022 17:50

Thomas Læssøe

https://svampe.databasen.org/observations/10283042

10-08-2022 15:45

Pierre-Yves Julien

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

02-08-2022 17:48

Pierre-Yves Julien

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16-08-2022 20:07

Bernard Declercq Bernard Declercq

Good evening,Who could be so kind to supply me fol

07-01-2014 23:04

Michel Hairaud Michel Hairaud

Bonjour à tous, Hi to all. This tiny bright yell

16-08-2022 15:50

Thomas Læssøe

https://svampe.databasen.org/observations/10283169

23-07-2022 20:47

Stefan Jakobsson

I made an abundant collection of some Preussia/Spo

15-08-2022 20:36

Marcus Yeo

While in NE Scotland recently I made a couple of c

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Anthostomella on Fraxinus
Enrique Rubio, 13-03-2015 18:14
Enrique RubioHello again

I'd like to know your opinion about this (I think) Anthostomella species growing on small branches (20 mm broad) of Fraxinus excelsior lying on the ground, at the sea level (Botanical Garden of Gijón/Asturias/Spain).


The inmersed, gregarious, blackish, roundish or elliptical perithecia, 1.20-1.35 microns in diam., are singly, in pairs or small groups just beneath the bark with only the short necks protruding. Many times an stromatized blackish clypeoid structure is present over the perithecia.


Asci cylindrical, 145-155 x 7.5-8,5, unitunicate, with an apical cylindrical apparatus up to 3 microns long, deeply blueing in IKI, with 8 more or less uniseriate 2-celled ascospores that seem to have very small caps at the poles (that are not well visible in china ink). These ascospores, close to those of A. rubicola, are allways hyaline or only a few of them at most slightly brownish inside the asci.


I don't know any species that fits with my fungus


Have you any idea?


Thanks again

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Jacques Fournier, 13-03-2015 18:51
Jacques Fournier
Re : Anthostomella on Fraxinus
Hola Enrique,
I have seen two collections of your fungus from France, one on Quercus ilex twigs collected by Paul Leroy, the other one on Acer twigs by C. Lechat. Very few ascospores develop a pale brown cell lacking a germ slit, just like in A. rubicola. Likely an undescribed lignicolous counterpart of A. rubi, as you suggested. Frustrating.
Cheers,
Jacques
Enrique Rubio, 13-03-2015 18:59
Enrique Rubio
Re : Anthostomella on Fraxinus

Thanks again, Jacques


There exists some pyreno that you have not seen? I think not...


My material will be keeped in my herbarium. Maybe you will need it...

Enrique Rubio, 13-03-2015 19:22
Enrique Rubio
Re : Anthostomella on Fraxinus

Hi Jacques


How did you describe the small polar caps of the ascospores? Had your spores these elements?


 

Jacques Fournier, 13-03-2015 19:30
Jacques Fournier
Re : Anthostomella on Fraxinus
they apparently vanish at dry state, I did not see them in Indian ink on the material I have.
An important differential character from A. rubi migght be the tendency to cluster in small groups and to have well differentiated papillate ostioles.
Jacques
Enrique Rubio, 13-03-2015 19:37
Enrique Rubio
Re : Anthostomella on Fraxinus
It is possible, Jacques. But I have studied them in fresh condition and in indian ink without success
Jacques Fournier, 13-03-2015 19:41
Jacques Fournier
Re : Anthostomella on Fraxinus
I did not see them in water either, this is why I tried India ink.
Enrique Rubio, 13-03-2015 19:44
Enrique Rubio
Re : Anthostomella on Fraxinus
I think is water the best way
Jacques Fournier, 13-03-2015 19:52
Jacques Fournier
Re : Anthostomella on Fraxinus
OK you won!
Jacques