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Francois Guay
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Josep Torres
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Edvin Johannesen
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Edvin Johannesen
These tiny (0.4-0.5 mm diam.), whitish, short-stip
Biscogniauxia spec.
Gernot Friebes,
08-02-2010 18:34
here I have a Biscogniauxia which I cannot determine:
Substrate: On Alnus, ca 150 cm over the ground.
Stromata: applanate, margin inconspicuous, 5-17 mm ø, surface dark-grey to black, very old turning light brown, with a black line in the substrate.
Ostioles: inconspicuous, hardly visible, often covered with black spore masses.
Perithecia: uniseriate, roundish, ovoid, broadly elliptic, elliptic or cylindric.
Spores: grey brown, filled with some oil drops, broadly elliptic or elliptic, 11-14 x 5-7 µm, sometimes uneven-rough, germ slit straight, over the whole length.
I think there are some similarities to B. granmoi which is quite common here on Prunus. Maybe you have an idea?
Best wishes,
Gernot
Gernot Friebes,
08-02-2010 18:36
Re:Biscogniauxia spec.
above perithecia, below ostioles
Gernot Friebes,
08-02-2010 18:37
Re:Biscogniauxia spec.
scale=10 µm
Gernot Friebes,
08-02-2010 18:37
Re:Biscogniauxia spec.
spores
Jacques Fournier,
09-02-2010 16:05
Re:Biscogniauxia spec.
Hi Gernot,
I agree it does not differ markedly from B. granmoi. This species is so far only known from Prunus padus but its ecology is still poorly known and occasional "jump" to another host is often possible.
I have a very limited knowledge of this species because I never found it in Pyrénées, although Prunus padus occurs in places. Nice finding!
Best wishes,
jacques
I agree it does not differ markedly from B. granmoi. This species is so far only known from Prunus padus but its ecology is still poorly known and occasional "jump" to another host is often possible.
I have a very limited knowledge of this species because I never found it in Pyrénées, although Prunus padus occurs in places. Nice finding!
Best wishes,
jacques
Gernot Friebes,
09-02-2010 19:38
Re:Biscogniauxia spec.
Hi Jacques,
thank you very much for answering! So it seems as if we'd have the first record of B. granmoi on a different substrate than Prunus because apart from the substrate there really aren't any noticeable differences (maybe the sometimes slightly rough spores?).
Best wishes,
Gernot
thank you very much for answering! So it seems as if we'd have the first record of B. granmoi on a different substrate than Prunus because apart from the substrate there really aren't any noticeable differences (maybe the sometimes slightly rough spores?).
Best wishes,
Gernot
Hermine Lotz-Winter,
10-02-2010 22:29
Re:Biscogniauxia spec.
Hi Gernot,
really very nice find! There are not so many reports from Germany and they are all from Prunus padus, as far as I know. One question: do you really think, that the spores are rough? From your photos I had the impression, that there were some remnants of a gelatinous covering on the surface. It might have looked different in the microscope, though. Regards, Hermine
really very nice find! There are not so many reports from Germany and they are all from Prunus padus, as far as I know. One question: do you really think, that the spores are rough? From your photos I had the impression, that there were some remnants of a gelatinous covering on the surface. It might have looked different in the microscope, though. Regards, Hermine
Gernot Friebes,
11-02-2010 06:54
Re:Biscogniauxia spec.
Hi Hermine,
well, I am not sure about whether the spores are rough or only have an uneven covering but my impression was that some spores (they clearly where an exception) really are slightly rough, e.g. the spores on my last picture. Anyway, I have material left and I could check on it again when I have more time.
Best wishes,
Gernot
well, I am not sure about whether the spores are rough or only have an uneven covering but my impression was that some spores (they clearly where an exception) really are slightly rough, e.g. the spores on my last picture. Anyway, I have material left and I could check on it again when I have more time.
Best wishes,
Gernot