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23-04-2015 20:19

Eduard Osieck

Hello all,Minute hyaline perithecia (0.05-0.06 mm)

30-04-2015 22:44

Bernard CLESSE Bernard CLESSE

Sur tige pourrie d'Urtica dioica.a) spores ± cyli

30-04-2015 16:42

Garcia Susana

Hi all:Can someone send me a pdf of the article:Sh

30-04-2015 09:30

Alex Akulov Alex Akulov

Dear friendsAmong the old samples, which are store

30-04-2015 12:00

Katarina Pastircakova

Hi there, Does anyone have these papers? Bagyana

29-04-2015 15:42

Leandro Sánchez Leandro Sánchez

Sur Abies, diamètre max 1mmSpores  16,20-18,60 /

28-04-2015 21:58

Jenny Seawright Jenny Seawright

Hello all, Found on Phragmites australis (?) at th

29-04-2015 11:36

Jean-Louis JALLA Jean-Louis JALLA

Bonjour à tous.Je sollicite votre aide pour ce pe

28-04-2015 20:35

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello,please, are the structures I observed in med

28-04-2015 00:14

Andrew N. Miller Andrew N. Miller

Not a Chaetosphaeria.  Not a Hilberina.  Any ide

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Acanthostigmella
Eduard Osieck, 23-04-2015 20:19
Hello all,

Minute hyaline perithecia (0.05-0.06 mm) with hyaline setae (20-23 um).
Bitunicate asci (30-40 x 10 mu) with 3-septate hyaline spores with big guttules: 13-16 x 4-5 um. One median cell larger than the other.
Substrate: Lophiotrema cf. neohysterioides (= curreyi) and on bark of Hedera.

I assume this belongs to the genus Acanthostigmella.
With the key included in the paper of Barr 1977 it easily keys out as A. pallida but this species has much smaller spores (7-10 X 2.5-3.5 um) and smaller ascii (20-25 x 10-11 um).
Six years later (Barr & Rogerson 1983) described A. brevispina (also known as Tubeufia brevispina) as a new species with spores which are more in agreement with my find: 14-18 x 4-5 um. However this species has larger ascii (50-60 mu) and also much larger perithecia (diameter 0.13-0.18 mm).

Belongs this find to Acanthostigmella? And what about the species?

I hope somebody has some knowledge about this species although the Ascofrance database does not contain any finds.

Eduard
  • message #35379
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Björn Wergen, 01-05-2015 00:01
Björn Wergen
Re : Acanthostigmella
Hi Eduard,

do you still have a piece of this collection for studying?

regards,
björn
Eduard Osieck, 01-05-2015 15:23
Re: Acanthostigmella
Hi Björn,

Yes the material is still in good condition, the perithecia have even multiplied over a larger area of the (not dead) Hedera twig. Apparently the ascomata become pale brownish after some time. Some ascomata are larger than indicated, up to 0,10 mm, but still smaller than in Barr's description of A. brevispina. However, I have found also much longer ascii, up to 64-75 um. They seem to stretch outside the perithecia. So it might very well be this species or a yet undescribed European counterpart. Particularly striking is the enlarged median cell ("2e loge sporale nettement renflee", quoted from Holm 1957).

I will send you the material today, than we get at least splendid photos :)

EDuard