Lachnum "subreynoutria"? - Forum ASCOFrance

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Lachnum "subreynoutria"?

Stefan Jakobsson, 21-06-2020 00:03

Once again a problematic Lachnum, this time of subkey 6 without crystals, not strongly refractive VBs and simple septate. The biggest disc is 1,3 mm but mostly less than half of that and the stipe is fairly short, up to 0,4 mm. It was growing on a thin twig of Betula (or ?Alnus) on wet ground, southern Finland.

The hairs are clavate or sometimes tapering, with up to three septa, no droplets and 50-70 x 4-5 µ. The paraphyses have some barely discernible small droplets, the size is 70-90 x 4-6 µ in the living state and they have two or three septa in the lower third, protruding 15-25 µ above the ascus tips. The asci are 8-spored, 40-50 x 4-5 µ. The spores have some vaguely visible droplets and are (6.5) 7.2 - 9.3 (9.6) × (1.5) 1.7 - 2.4 (2.7) µm.

This leads me to Lachnum "subreynoutria". It is once mentioned on ascofrance:
http://ascofrance.com/search_forum/12116

Is the species better known now ten years later or is this someting else?

Hans-Otto Baral, 21-06-2020 07:51

Re : Lachnum "subreynoutria"?

Hairs of L. reynoutriae were 50-90 µm long, I guess yours are shorter?

Also I do not see any living paraphyses on your pics, the droplets are probaby lipidic and do not disappear in KOH.

Anyway, I cannot say if L. reynoutriae is specific to Reynoutria, especially since various lignicolous species have been found on that host.

I think Lachnum can only safely be approached with detailed docus (like yours) and a parallel DNA study, and we are far away from this.

I have no alternative species in mind to which yours might fit, but my key is old and various potentially different species were detected in the meantime.

Zotto

Stefan Jakobsson, 21-06-2020 15:01

Re : Lachnum "subreynoutria"?

Thank you! Actually the path through the key did not stop at L. "reynoutriae" but at L. "subreynoutriae" where the average spore size 8,2 x 2,0 is a better match. The hairs are 50-70 long, perhaps somewhat shorter on the flanks.

I have tried to find newer litterature but there seems not to be very many publications on new European Lachnum species or combinations, at least not anything of relevance for this case. I have mostly found only Asian papers, which I have not cheked out in detail.

Unfortunately I forgot the collection on the table to dry overnight, so now it is light brown. Anyhow, I made an attempt with KOH and CRB, photos attached. I also found a yesterday photo in water with paraphyses looking more alive.

Hans-Otto Baral, 21-06-2020 16:25

Re : Lachnum "subreynoutria"?

No, they are all dead, but because of the reddening the paraphyses should have been prominently multiguttulate.

Marketa Chlebicka/Sukova/Sandova wrote some articles on European Lachnums.

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