Encore un indéterminé de l'an dernier, d'une réserve dont je m'occupe (réserve naturelle de Wilbrote, région de Durbuy, Calestienne, prov. LX, B.). Sur tige morte de Hypericum perforatum, le 30.04.12. Non conservé, c'est pour avoir une idée.

Alors là, c'est un bituniqué je pense, mais hormis cela, je donne ma langue au chat!

Fentes -> 0.5 mm, s'ouvrant par déchirure, en groupes. Péridium olive, se déchirant, formant presque une apothécie. Hyménium incolore.
Asques 8-sporés, sp. unisériées ou irrégulièrement bisériées en quinconce. Pas d'appareil apical. Epaisseur x 9-10.5 µ. IKI négatif. Apparemment pas de hamatécium.
Spores hyalines, 1 à 3-septées, (15)17-20 x (4.8)5.5-7 µ. On observe souvent quelque chose que j'ai interprété comme des spores germées, à moins que cela ne soit des conidies (voir photo).

Une idée?
Amitiés - Luc BAILLY.?

Hans-Otto Baral, 28-01-2013 17:56

Re : Bituniqué s/ Hypericum perforatum.

Hi Luc

I suppose you have what I tried to identify as "Tarbertia" (tentatively but probably wrongly placed in Durelloideae). But there is something quite similar which we identified as Exarmidium inclusum (Hyponectriaceae), which has more perithecioid ascomata.

Click here:
https://www.cubby.com/p/_778a6f3587954e008790666f822f8e4e/7a+Helotiales#7a%20Helotiales/Durella%20group/Tarbertia
https://www.cubby.com/p/_94bc7715309f400391e776656de1b46e/8g+Xylariomycetidae#8g%20Xylariomycetidae/Hyponectriaceae/Exarmidium

I remember we had already a thread on Exarmidium here.

Zotto

Martin Bemmann, 28-01-2013 21:26

Re : Bituniqué s/ Hypericum perforatum.

Yes Zotto, it was here:
http://www.ascofrance.fr/search_forum/12420?

my collection "matched" E. cf. diaphanum.

Regards

Martin

• Exarmidium-diaphanum-18VII2010-en-0001.pdf

Luc Bailly, 28-01-2013 22:57

Re : Bituniqué s/ Hypericum perforatum.

Hi Zotto, hi Martin,

The shape of the spores matches with Tarbertia sp. from Zotto's collections, but yours are too small to fit, so I reject this hypothesis (at least that species).

Martin, what you posted is very similar to what I found. I'll have to check the paper on Exarmidium tomorrow, because Cyberliber seems down atm. Then, I'll tell you if I find something. I wouldn't be that surprised to see a species growing on woody substrates on Hypericum, because Hyericum is quite lignified.

Thanks to both, and cheers - Luc BAILLY.

Hans-Otto Baral, 28-01-2013 23:08

Re : Bituniqué s/ Hypericum perforatum.

But consider that your specimen seems somewhat overmature, with germinating spores. The spores inflated and get more constricted thereby. I noted up to 6.3 µm wide spores when overmature.

Zotto

Luc Bailly, 28-01-2013 23:31

Re : Bituniqué s/ Hypericum perforatum.

Hi Zotto,
That's a possibility the spores I have are too big due to being overmature: they're germinating.

By the way, I took my notes and I noticed when studying my samples there were sometimes 2 ascomas below the clypeus, witch is mentioned in the paper about Exarmidium (Martin just sent it to me). My sample fits quite well the description of Exarmidium diaphanum. Also, the general shape of the ascoma's fits way better with an Exarmidium.

So, for me, either it's Exarmidium diaphanum, or something very close.

Cheers - LUC.