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08-05-2019 17:28

Edvin Johannesen Edvin Johannesen

These small, black cushions were collected on a th

07-05-2019 21:54


Has anybody of you ever met this amazing pycnidial

08-05-2019 07:36

Zuzana Egertova Zuzana Egertova

Hello,could someone send me this thesis, please?La

07-05-2019 15:47

Gao Hanxing

Dear all,I am looking for the following document:1

04-05-2019 10:34

Gao Hanxing

Hello all, I found this pyrenomycete, which I ass

03-05-2019 10:16

Zeljko Tomic

Dear colleagues, this is something that I have not

06-05-2019 21:05

Joop van der Lee

I am looking for the following document:Luck-Allen

04-05-2019 22:16

Riet van Oosten Riet van Oosten

Hello, Found by Willy Heimeriks on 27-04-2019, Th

05-05-2019 23:28

Lieve Deceuninck Lieve Deceuninck

BonjourJe vous présente une Scutellinia qui est c

06-05-2019 17:43

Eduard Osieck

This Pyrenochaete collection comes from Urtica.Set

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Black acervuli with strange brown "phragmo"conidia
Edvin Johannesen, 08-05-2019 17:28
Edvin JohannesenThese small, black cushions were collected on a thin twig (presumabley deciduous). Very strange conidia appeared under the microscope (in KOH). The septa appear to be wavy, partly transversal, partly longitudinal, so possibly muriform. Some have a hyaline, apical appendage/pedicel-like structure at one end. In phase contrast a slimy (gelatinous) matrix becomes evident. Are genera like Coryneum or Seiridium possibilities or am I on the wrong track? Suggestions appreciated. Thanks!
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Lothar Krieglsteiner, 08-05-2019 17:43
Lothar Krieglsteiner
Re : Black acervuli with strange brown "phragmo"conidia

Hello Edvin,

whatever fungus this could be - the "conidia" you show appear as strongly collapsed to me - likely due to age.

They could also be ascospores with the asci already faded (?).

Yours, Lothar

Edvin Johannesen, 08-05-2019 17:54
Edvin Johannesen
Re : Black acervuli with strange brown "phragmo"conidia
Thanks, Lothar.  In fact, it was collected a months ago and it was studied without drying, but of course, the fungus may have "wintered".  It looks pretty fresh, though.  I doubt they are ascospores, since several have the appendage (although I guess that doesn't totally rule out ascospores).