Re : Phaeosphaeria => Pleosporaceae => Pleospora abscondita

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Re : Phaeosphaeria => Pleosporaceae => Pleospora abscondita

Riet van Oosten, 18-05-2018 18:38

Hello,

Found 17-05-2018, The Netherlands.
On: Phragmites australis.

Spore sizes: 31.9-32.2-32.6-32.9-34.6-35.0-35.8-36.3-38.3-38.6 x 8.9-10.0-10.0-10.3-10.3-10.6-10.7-10.9-11.3-11.4 µm.

Q = 3.3 n = 10

Vagicola vagans doesn't fit .....
Ellis & Ellis p. 465: spore sizes 20-32 x 7-10
Shoemaker and Babcock p. 1574: 23-28 x 8-10

Greetings,
Riet

Mlcoch Patrik, 11-06-2018 21:11

Re : Phaeosphaeria, subgenus Vagispora or ........

This isnt Phaeosphaeria, but rather something from the Pleosporaceae - characteristic presence longitudinate septum.

Riet van Oosten, 11-06-2018 21:24

Re : Phaeosphaeria, subgenus Vagispora or ........

Hello Patrik,
Thank you very much for your help!
Greetings, Riet

Chris Yeates, 13-06-2018 04:49

Re : Phaeosphaeria, subgenus Vagispora? => Pleosporaceae

Hello Riet

Despite the slightly larger spore measurements I would still be tempted to call this Phaeosphaeria vagans. In my experience there can be variation in ascospore dimensions with these fungi.

Also, the presence of muriform spores does not exclude Phaeosphaeriaceae - they are known in this family.

Best wishes

Chris

Riet van Oosten, 13-06-2018 08:44

Re : Phaeosphaeria, subgenus Vagispora? => Pleosporaceae

Hello Chris,

Yesterdag I searched in the direction Patrik suggested.

I came across Pleospora abscondita.

- In Van Ryckegem, G. (2005) "Fungi on common reed (Phragmites australis). Fungal diversity, community structure and decompositions processes": "asci 110-130 x 15-20 um, ascospores 28-35 x 10-13 um, 5-septate, with one to several longitudinal septa (end cells without longitudinal septa)

- In the book "Niet zomaar een bos....!!; natuuronderzoek op de cm2 in het Coovels Bos": "asci 150-200 x 15-20, ascospores 33.3-41.0 x 8.1-10.8 µm, 5-7-(8)-septate, with one (partial) longitudal septum".

Listed in "artikelen (2)" and "standaardwerken (1)" on https://www.verspreidingsatlas.nl/0766010#

This could fitt.

Best wishes, Riet

Mlcoch Patrik, 13-06-2018 09:52

Re : Phaeosphaeria, subgenus Vagispora? => Pleosporaceae

I don´t see now P. vagans and i dont´t also excude something from Phaeosphaeriaceae (for example Allophaeosphaeria, Phaeosphaeria (Vagispora) phragmiticola and vagans), but presence longitudinate septus is far more typical for Pleosporaceae. According to Shoemaker P. phragmiticola and vagans they has spore 23-30 um long, and here are spore larger (30-40 um).
However, i just found it information, that according to Müller (1950, as Leptosphaeria vagans) has P. vagans spore 36-42 x 7-9 um, therefor i have to agree with Chris .

Riet van Oosten, 17-06-2018 09:18

Re : Phaeosphaeria, subgenus Vagispora? => Pleosporaceae => Pleospora abscondita

Dear Chris, dear Patrik,

I sent a mail to Henk Lammers (Dutch specialist), one of the authors of the book "Niet zomaar een bos ....!!".

With reservation (he didn't see the real material) he thinks it is Pleospora abscondita Tomorrow I will send him the material for a final decision.

Without your help this species of 17-05-2018 would have been nameless ....

Thank you so much! Greetings, Riet

Riet van Oosten, 20-06-2018 23:27

Re : Re : Phaeosphaeria => Pleosporaceae => Pleospora abscondita

Got a message from Henk Lammers, it is indeed Pleospora abscondita!

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