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Diaporthe or related? On dogwood twig.
Edvin Johannesen,
04-06-2020 19:30
I did not draw the black lines here - the fungus did!
The perithecia are quite deeply embedded, sometimes more than one, but few, in a group. Spores very large, but variable in length; 35-65 x 8-10 microns, 1-septate, slightly constricted at the septum, filled with variably sized droplet, bearing ca. 4 microns long hyaline appendages at the poles. Asci irregularly biseriate. Ascus apparatus ring-shaped. Spores measured an photographed in water. Phase contrast used in order to see the spore appendages.
Are we in Diaporthaceae (Diaporthe) or Gnomoniaceae (Pseudodiaporthe) or somewhere else?
Thanks in advance.
Edvin Johannesen,
04-06-2020 19:31
Re : Diaporthe or related? On dogwood twig.
Some microscopic details.
Edvin Johannesen,
04-06-2020 19:33
Re : Diaporthe or related? On dogwood twig.
The dogwood species is Swida sericea (=Cornus stolonifera).
Eduard Osieck,
08-06-2020 22:25
Re : Diaporthe or related? On dogwood twig.
Hi Edvin
Compare with Diaporthe tessella which species has such large, appendaged spores and stromatic line. Nice drawing of spores and stroma in Wehmeyer 1933 (Diaporthe world monograph). A link to this book is given on www.verspreidingsatlas.nl/0740020 (see tab Artikelen).
Eduard
Compare with Diaporthe tessella which species has such large, appendaged spores and stromatic line. Nice drawing of spores and stroma in Wehmeyer 1933 (Diaporthe world monograph). A link to this book is given on www.verspreidingsatlas.nl/0740020 (see tab Artikelen).
Eduard
Edvin Johannesen,
08-06-2020 22:28
Re : Diaporthe or related? On dogwood twig.
Thanks a lot, Eduard - I will check :)