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Setoseptoria arundinacea/Lentithecium arundinaceum?
Riet van Oosten,
15-07-2018 17:56
Hello,
Found 14-07-2018 on Phragmites australis (dead stem).
Det.: Ellis & Ellis, p. 511 (Leptosphaeria arundinacea)
Spore sizes: 25.0-25.7-27.2 x 5.0-5.0-5.3 µm
Is this Setoseptoria arundinacea?
Greetings, Riet
Chris Yeates,
16-07-2018 04:00
Re : Setoseptoria arundinacea (Lentithecium arundinaceum)?
Hello Riet
the habit, with pseudothecia arranged in lines looks OK, though I have some doubts. The spores seem a little on the small side for this species perhaps, and I always think of them with rather acute apices.
Still you could be correct - can you see a sheath? - particularly noticeable at the spore apices as here (arrowed):
best wishes
Chris
PS Jacques Fournier may be able to comment better than me . . .
Riet van Oosten,
16-07-2018 12:07
Re : Setoseptoria arundinacea (Lentithecium arundinaceum)?
Hello Chris,
Thank you for your help!
I will see if I can find sheaths.
Best wishes, Riet
Thank you for your help!
I will see if I can find sheaths.
Best wishes, Riet
Alain GARDIENNET,
16-07-2018 14:10
Re : Setoseptoria arundinacea (Lentithecium arundinaceum)?
Hi,
It's probably the fungus called Massarina arundinacea (Sow.: Fr.)Leuchtmann. But what is Massarina today ?
I don't know why this fungus is given synonym of L. arundinaceum (cf Mycobank). Easy to recognize the fungus, but difficult to name it correctly to my mind.
Alain
Chris Yeates,
16-07-2018 14:53
Re : Setoseptoria arundinacea (Lentithecium arundinaceum)?
Yes
another un labyrinthe de noms . . . The key paper (currently) seems to be Tanaka et al. "Revision of the Massarineae (Pleosporales, Dothideomycetes)" in Studies in Mycology 82: 75-136.
It is open access, and downloadable here: https://www.sciencedirect.com/journal/studies-in-mycology/vol/82/suppl/C
Attached are a couple of relevant "screen-grabs".The transfer to the genus Setoseptoria is, the authors themselves admit, tentative.
It is interesting to note the comment at the end that this taxon may contain cryptic species; this may explain the differences between Riet's collection and mine, pictured above.
Amitiés / Vriendschappen
Chris
Riet van Oosten,
16-07-2018 18:10
Re : Setoseptoria arundinacea/Lentithecium arundinaceum?
Thank you both for all the information, good to know!
Greetings, Riet
Riet van Oosten,
18-07-2018 16:50
Re : Setoseptoria arundinacea/Lentithecium arundinaceum?
Follow-up ...
First picture, material 14-07-2018, spores with sheaths?
The other pictures material 12-07-2018
On 12-07-2018 I had collected material from another place in the same area (distance about 1000 m)
14-07-2018 dead culms near a river
12-07-2018 dead culms near a small pond, nearby the river.
Spores in the material 12-07-2018 with rather acute apices.
Also sheaths or is it an optical illusion?
Chris Yeates,
18-07-2018 17:35
Re : Setoseptoria arundinacea/Lentithecium arundinaceum?
Hello Riet.
Surely no question this is arundinacea/arundinaceum. Which genus the species should be placed in is a bit more complicated - even the experts are not sure ;-).
best wishes
Chris
Riet van Oosten,
18-07-2018 19:03
Re : Setoseptoria arundinacea/Lentithecium arundinaceum?
Hello Chris,
Thank you for all your help! :-)
Best wishes, Riet
Thank you for all your help! :-)
Best wishes, Riet