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02-07-2025 18:45

Elisabeth Stöckli

Bonsoir,Sur feuilles d'Osmunda regalis (Saulaie),

02-07-2025 17:26

Yanick BOULANGER

BonjourRécolté sur une brindille au fond d'un fo

02-07-2025 09:32

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello, bonjour.Here is the paper I'm searching for

30-06-2025 16:56

Lydia Koelmans

Please can anyone tell me the species name of the

01-07-2025 23:37

Josep Torres Josep Torres

Hello.A Pleosporal symbiotic organism located and

30-06-2025 12:09

Edvin Johannesen Edvin Johannesen

This tiny, rather "rough" erumpent asco was found

30-06-2025 06:57

Ethan Crenson

Hi all, Another find by a friend yesterday in Bro

30-06-2025 19:05

ALAIN BOUVIER

Bonjour à toutes et à tousJe cherche à lire l'a

30-06-2025 14:45

Götz Palfner Götz Palfner

This is a quite common species on Nothofagus wood

25-06-2025 16:56

Philippe PELLICIER

Bonjour, pensez-vous que S. ceijpii soit le nom co

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Lophiostoma myriocarpum
Chris Yeates, 06-10-2014 20:36
Chris YeatesBonsoir tous
I recently collected a partially-decorticated twig in woodland near a stream. I originally suspected that it might be a Chaetosphaeria, but under the microscope it was clearly not - fissitunicate asci proved that. Many, but by no means all, of the perithecia were somewhat laterally compressed and I considered Lophiostoma. Holm & Holm 1988 (Symb. Bot. Upsal. XXVIII) led me to Lophiostoma myriocarpum; the description fitted well, although the accompanying drawing (from the type collection) was not very convincing.
ASCOFrance came to the rescue in the form of Alain and Zotto:
http://www.ascofrance.com/search_forum/7390

I am pretty certain that my fungus is indeed Lophiostoma myriocarpum (or at the very least the same as Alain's fungus, although his spores are longer), this based on the narrowly fusoid multiguttulate spores 27.6-30.8 x 4.8-5.5µm. These were mostly 5-septate, though some were seen with up to 7 septa (the latter could be seen germinating from the polar cells - see the last photo).

As far as I can tell this taxon has not been recorded for Great Britain & Ireland, although there are two records for Lophiostoma vigheffulense (Pass.) Chesters & A.E. Bell. Holm & Holm suggest the two are conspecific - though the spore dimensions given in Chesters and Bell (Mycol. Pap. 120) are smaller and their drawing shows consistently 3-septate spores, with the comment that these are not constricted at the septa.

As ever comments and suggestions are more than welcome.

Cordialement
Chris
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