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Diaporthe? on Berberis communis

Jakob Schneller, 24-09-2015 16:59

The spores are extrordinary large 36-39 um x 18.20 um. The asci 140-160 um. Pyrenocarpous,growing immersed and the opening splitting the the bark, black. on branches of Berberis

Stoykov Dimitar, 25-09-2015 14:11

Re : Diaporthe? on Berberis communis

Hi, Dear Jacob,

Maybe useful to try another genus. Beak of the perithecium is not seen (in genera of the Diaporthaceae and Melanconidaceae they always present).

Regards, Dimitar

Stoykov Dimitar, 26-09-2015 09:10

Re : Diaporthe? on Berberis communis

I have checked, as far as possible, in Wehmeyer's monographs (about Diaporthe - 1933), and about Melanconis and allied genera (1941). The stroma of your find looks like those of Melanconidaceae , but I don't know if the spores have appendages. If present - this fungus could be attached to Prosthecium (maybe an undescribred one), but I am not familiar with Prosthecium.
In Wehmeyer's monograph (1933) there are 2 species amongst the large spored ones - Cryptodiaporthe magnispora (Acer) and C. pyrrhocystis (Alnus, Coprylus) - but the spores are not constricted at septa and are much thinner (6) 7-9 micrometers.

Alain GARDIENNET, 27-09-2015 16:02

Re : Diaporthe? on Berberis communis

Bonjour,

Before searching in Diaporthales, the first question should be : are the asci bitunicate or unitunicate ?

Alain

Stoykov Dimitar, 28-09-2015 14:21

Re : Diaporthe? on Berberis communis

Yes, the right question to answer. Thank you, Alain!
Regards,

Dimitar

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