Diaporthe spiculosa? - Forum ASCOFrance

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Diaporthe spiculosa?

Maren Kamke, 17-02-2026 09:41

Good morning,

I found a Diaporthe species on Sambucus nigra that I currently suspect to be Diaporthe spiculosa. I would greatly appreciate any opinions or confirmation regarding this identification.

The full field documentation and photos are available here:
https://www.inaturalist.org/observations/338900548

Kind regards,
Maren

Mathias Hass, 17-02-2026 10:29

Re : Diaporthe spiculosa?

Looks like Diaporthe. It seems to me what I would call Diaporthe circumscripta (as in Ellis and Ellis). I was not aware of the name D. spiculosa. Curiously Diaporthe circumscripta is listed some places (eg. Bladmineerders) as synonym to Aglaospora profusa (Pleosporales !!!), but not by Index Fungorum, which has Aglaospora profusa by the current name Massaria anomia. I have no idea what the correct name should be or whether D. spiculosa and D. circumscripta are the same thing or different species.

Cheers Mathias

Enrique Rubio, 17-02-2026 14:01

Re : Diaporthe spiculosa?

Hi both.
This is what I identified years ago as Diaporthe spiculosa on Sambucus nigra. The spores appear to be larger than those cited for Diaporthe circumscripta.
Cheers

Mathias Hass, 18-02-2026 12:54

Re : Diaporthe spiculosa?

Maybe helpful

Mathias Hass, 18-02-2026 14:13

Re : Diaporthe spiculosa?

Wehmeyer (p.261) seem to consider D.spiculosa synonymous with D. circumscripta. His sporemeasures are: 12-15 x 2,5-4. See:

http://www.ascofrance.fr/uploads/forum_file/1932-v17-237-0001-0001.pdf

Enrique Rubio, 18-02-2026 20:26

Re : Diaporthe spiculosa?

Hi Mathias.

However, Wehmeyer (The Genus Diaporthe) considers Diaporthe spiculosa to be a priority. Basyonim. Spaheria spiculosa Alb. & Schwein.

Mathias Hass, 18-02-2026 22:14

Re : Diaporthe spiculosa?

Hi Enrique,

I guess you are rigth, but I'm not into the finer details of taxonomy :-) Hypoxylon spiculosum (1857) -> Diaporthe spiculosa (1870) (the name Spaheria spiculosa(1805) is listed as nom. illegit.) seems to beat Diaporthe circumscripta (1870) . Of course this asumes that the are the same species...would require DNA to be certain, I guess, as Diaporthe species differ very little in morphology.

Maren Kamke, 18-02-2026 23:21

Re : Diaporthe spiculosa?

Hi Mathias, hi Enrique,
thanks a lot to both of you for the helpful input.

Based on your comments (and Wehmeyer's treatment), I'm happy to keep this collection under Diaporthe spiculosa (= D. circumscripta sensu Wehmeyer) on Sambucus nigra. I agree that morphology alone has its limits in Diaporthe, so I've kept the specimen in case sequencing can be done later to confirm the determination.

Kind regards,
Maren

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