Arachnopeziza - Forum ASCOFrance

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Arachnopeziza

Elisabeth Stöckli, 18-04-2020 21:45

Bonsoir,

Trouvé sur face cachée d'un morceau de conifère (au bord d'un ruisseau à 745 m), apothécies 0.4 - 0.8 mm de diamètre (incl. poils), blanc, sessiles, surface externe couvertes de poils, grégaires, asques 52 - 70 x 7 - 8 µm, octosporés, J+, avec crochet, spores 9 - 14 x 2.75 - 3.1 µm, pharaphyses filiformes, ramifiées, poils hyalins et multiseptés, à exsudats jaunâtres, jusqu'à 180 µm.

Merci d'avance pour votre aide.

Elisabeth

Kosonen Timo, 18-04-2020 22:11

Re : Arachnopeziza

Simply impressive.

The hairs are exceptionally long, slender and multimulti-septate. The hair length is a fairly regular character in the genus as far as I know. I have some collections of Arachnopeziza from softwood, but nothing like this. I dont have good suggestions. Maybe one of the less collected species in Korf's monograph? Also, usually there is atleast one septa in mature spores, maybe there are some tomorrow?

What kind of population was it? This is something special, a culture is obligatory, should I send you some plates? :-)

Timo

Elisabeth Stöckli, 22-04-2020 13:08

Re : Arachnopeziza

Merci Timo,

after three days only some ascospores one septa.

Elisabeth

Kosonen Timo, 22-04-2020 13:46

Re : Arachnopeziza

ok. thanks

Really no idea. The possible name I had in my mind was A. fitzpatrickii, but it doesn't fully fit the description. Maybe Luis has seen it in the USA? :-). Any comments? ...but just a shot. The combination of spores and hairs in this specimen does not fit anything I know. What was the conifer in question, Pinus, Abies?

Timo

Elisabeth Stöckli, 23-04-2020 08:20

Re : Arachnopeziza

Difficult, the wood is destroyed (brown rot), I guess Picea.

Elisabeth

Quijada Luis, 23-04-2020 16:24

Re : Arachnopeziza

Hi Timo, Hi Elisabeth
This is not A. fitzpatrickii. The macro is very different, but also the hairs. We are writing an small manuscript about this collection and we have sequences. I will reach you Timo when the manuscript is done. A researcher that visit us that had no projects in mind decide to work on that, but it was just before the COVID and now the manuscript is stopped. The hairs of A. fitzpatrickii are like teeth, all of them cemented and you can count them (see attached)
Best wishes
Luis

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