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15-09-2021 12:41

Mirek Gryc

Hello allDear forum members, are my suspicions cor

16-09-2021 22:08

jean claude chasle

Bonsoir, Récolté en milieu humide sur brindille

15-09-2021 19:48

Andgelo Mombert Andgelo Mombert

Bonsoir, Sur branche morte d'Alnus alnobetula, en

16-09-2021 12:07

Castillo Joseba Castillo Joseba

De ayer en corteza de fagusA ver si hay alguna sug

15-09-2021 17:52

Ueli Graf Ueli Graf

The ostropalean fungi (Mycotaxon) 1977 von Martha

12-09-2021 12:18

Andgelo Mombert Andgelo Mombert

Bonjour, Sur tige morte d'Equisetum sp., vers 200

14-09-2021 19:26

Andgelo Mombert Andgelo Mombert

Bonsoir, Sur tiges mortes d'Epilobium angustifoli

14-09-2021 19:01

Juuso Äikäs

I found some small Lachnum-like fungi a couple day

09-09-2021 15:18

Maria Plekkenpol

Hello,On pieces of acorn cap buried in the ground

14-09-2021 19:41

Enrique Rubio Enrique Rubio

Could someone give me a copy of this item?Coniocha

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Diaporthe trinucleata - rare or overlooked?
Chris Yeates, 21-07-2021 20:01
Chris Yeates
Bonsoir tous

I recently collected some dead stems of Eupatorium cannabinum with the purpose of producing a composite image of Plenodomus agnitus (= Leptosphaeria agnita) which is common on that host in this area.

I noticed that among the numerous pseudothecia of that fungus there were much scarcer smaller fruitbodies mostly immersed in the host plant's cortex, and with pointed necks very different from the shallowly domed Plenodomus. From the apical ascal structure it was clear that this a member of the Diaporthales, and probably a member of the Diaporthaceae.

Having recently written up the Diaporthales for an ongoing Yorkshire Mycota I fully appreciate the nomenclatural and taxonomic issues with that order and might well have moved on. However there were a couple of interesting features: one was the complete lack of a septum, which pointed to what would at one time have suggested a member of Diaporthopsis (now sunk into Diaporthe), and the other was the high proportion (>90%) of spores containing three large guttules. Searching through Munk (1957) and Wehmeyer (1933) indicated that there was such a species and that it was a Eupatorium specialist - Diaporthe trinucleata Niessl. So I am quite happy to use that name for this collection, although I appreciate that sequencing might in future shed more light on this. Of interest is that on a few of the spores a hyaline conical appendage at each end of the spore could just be made out - easier to see than to photograph! Munk mentions no such feature and Wehmeyer specifically states he didn't see it, but Niessl in his protologue mentions "...utrinque obtusiusculis breve mucronatis hyalinis...".

I shall certainly keep an eye out for this taxon on further encounters with Eupatorium, and wondered whether anyone else had found it?

Cordialement, Chris
  • message #69568
Thomas Læssøe, 21-07-2021 20:58
Re : Diaporthe trinucleata - rare or overlooked?
I have made two Danish records on this species on that host (no notes available on the database, maybe with the material)


cheers

Thomas
Chris Yeates, 23-07-2021 14:18
Chris Yeates
Re : Diaporthe trinucleata - rare or overlooked?
Thanks for that Thomas. So the host relationship seems consistent - do you find Plenodomus agnitus to be rather common on Eupatorium in Denmark as well?

kind regards, Chris