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05-07-2025 12:38

Åge Oterhals

I found this pyrenomycetous fungi in pine forest o

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Charles Aron Charles Aron

Hi All, I found this Octospora growing with liver

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Josep Torres Josep Torres

Hello.A fungus growing on the surface of a trunk o

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Josep Torres Josep Torres

Hello.Small, blackish, mucronated surface grains s

28-06-2025 16:00

Josep Torres Josep Torres

Hello.A tiny fungus shaped like globose black grai

04-07-2025 12:43

Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

03-07-2025 18:40

Castillo Joseba Castillo Joseba

me mandas el material seco de Galicia (España) re

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Francois Guay Francois Guay

I found this interesting yellowish asco growing on

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Josep Torres Josep Torres

Hello.A Pleosporal symbiotic organism located and

02-07-2025 17:26

Yanick BOULANGER

BonjourRécolté sur une brindille au fond d'un fo

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Dermea padi or prunastri ?
Peter Püwert, 14-02-2017 02:46
Peter PüwertHi all,
this Dermea if I have in accordance with GROVES (1946), DENNIS  (1981), ELLIS (1985) ... as Dermea padi definitely. Conidiospores 19,2 - 22,1 x 2,4 - 2,7 µm.
Now here I find these statements:

http://www.ascofrance.fr/recolte/3558/leotiomycetes-helotiales-dermateaceae-dermea-padi
http://www.ascofrance.fr/recolte/2880/leotiomycetes-helotiales-dermateaceae-dermea-prunastri
https://www.cubbyusercontent.com/pl/CC%2bAscomycota/_1354d48ffaad4b59bd3ffdbb35915d1f#CC 

Where does the error lie here?
Greetings Peter.
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Hans-Otto Baral, 14-02-2017 08:27
Hans-Otto Baral
Re : Dermea padi or prunastri ?
I fear this cannot be answered easily. Groves did not study a type of D. prunastri when he reported such wide conidia for that species. His description recalls for me D. padi, whereas his description of D. padi recalls D. prunastri as I interpret these species. I observed a high host specificity and suspect that your collection was on Prunus spinosa, right?

Groves gives several Prunus species for D. padi and merely "Prunus spp." for prunastri.  For D. padi he says that the spores are sickle-shaped to almost straight, 2.5-4 µm wide, and for prunastri +/- straight, mainly 5-7 µm wide.

One of the species  studied by Groves (Roumeguere) was named Cenangium prunastri but Groves identified it as D. padi. 

These old taxa described by Albertini & Schweinitz and Persoon and Fries are probably not documented by exsiccata and surely lack microscopic data in their description. So I think a revision is needed which defines neotypes. These should be collected in Europe, maybe in America different species exist.

The choice of the names prunastri and padi by us might have followed simply the host specificity which leads to padi for the species on Prunus padus.

I see that besides P. spinosa I have seen also a sample on Prunus domestica with narrow falcate conidia.

Zotto
Peter Püwert, 14-02-2017 20:33
Peter Püwert
Re : Dermea padi or prunastri ?
Hi,
yes, the illustrated finding was on overgrown/ wild Pr. domesticum.

I already understand the connections, but actually I should have formulated my question in a different way: Are with GROVES, DENNIS ....... to certain finding now wrongly ?
Greetings Peter.
Hans-Otto Baral, 14-02-2017 20:46
Hans-Otto Baral
Re : Dermea padi or prunastri ?
What is right and what is wrong needs to be brought out by a detailed study. First we must look whether a host species is indicated in the protologue, I did not look up so far, and I just se it is difficult.
 Sometimes the identity of a name depends on the epitype that is proposed.