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Un Lachnum qui devient rouge
Debbie Klein,
06-02-2022 06:41
Le 4 Juillet du 2020 j'ai trouvé, dans le Forêt National Tahoe dans les montagnes de la Californie, un Lachnum qui rougit. Voici l'observation sur Mushroom Observer: https://mushroomobserver.org/415409. Je l'ai trouvé encore le 29 mai, 2021. Voici mon observation sur Mushroom Observer: https://mushroomobserver.org/453975, et l'observation de mon amie Alison Pollack sur iNaturalist: https://www.inaturalist.org/observations/106218267 Elle fais de tres bons agrandissements avec la photographie macro. Notre ami Alan Rockefeller a fait de la microscopie dans les observations sur Mushroom Observer. Il a aussi fait un sequence DNA, pour l'observation 453975 et celle de Alison 106218267. Des arbres dans les environs sont Abies magnifica et Pinus contorta. Nous apprécierions des ideés sur quelle Lachnum ça peut être. Merci!
Michel Hairaud,
06-02-2022 08:51
Re : Un Lachnum qui devient rouge
Bonjour Debbie,
As you probably know, reddening is not rare in Lachnum and is due to oxidation of vacuolary bodies (VBs) in paraphyses.
Microscopic data are needed (ascus base and length, hair length, presence of crystals , spore oil content and measurments...) to try a determination.
I am sending to your mail box a Lachnum key by HO Baral which can help . Not sure that your find matches a European species.
Amitiés
Michel
As you probably know, reddening is not rare in Lachnum and is due to oxidation of vacuolary bodies (VBs) in paraphyses.
Microscopic data are needed (ascus base and length, hair length, presence of crystals , spore oil content and measurments...) to try a determination.
I am sending to your mail box a Lachnum key by HO Baral which can help . Not sure that your find matches a European species.
Amitiés
Michel
Hans-Otto Baral,
06-02-2022 10:29
Re : Un Lachnum qui devient rouge
Under the second link I do not find the fungus. Under the first I see only hyphal elements, no hairs, no hymenial elements. Did I overlook something?
The VBs which Michel mentioned are only visible in the living state.
What is the result of the sequences, what does it match in GenBank?
P.S. now I detected the middle of the three links :-)
o.k., the hairs have an acute tip, quite unusual, but not always prominently. The paraphyses are rather narrow. This pics are too small to see the ascus base.
What was the mounting medium? It doesn't look like water.
A further remark: The apothecia look partly immature. I remember that Lachnum hairs of immature asci are often with acute apex, so possibly when more mature they change to obtuse or even capitate.
Debbie Klein,
07-02-2022 01:36
Re : Un Lachnum qui devient rouge
Thanks very much Hans-Otto for your comments. The mounting medium was 5% KOH. Next time I find the species I’ll hope to get more information.
Debbie Klein,
07-02-2022 01:38
Re : Un Lachnum qui devient rouge
Thanks very much Michel for the key and your comments. It’s a learning process. Hopefully I’ll have more information next time I find it.
Amitiés,
Debbie
Amitiés,
Debbie
Hans-Otto Baral,
07-02-2022 08:31
Re : Un Lachnum qui devient rouge
I hope you will use water as mounting medium when you find this Lachnum again. This is essential in the genus and in any other fungi when studying fresh finds.
Debbie Klein,
08-02-2022 06:05
Re : Un Lachnum qui devient rouge
I’ll use water as a medium next time I find them and with other fungi. That was also strongly advocated by our guides Nevin Matocec and Ivana Kusan last year on a mushroom trip in Croatia. Thanks for the advice.