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27-10-2025 00:34

Francois Guay Francois Guay

I found this strange species in Québec,Canada, gr

27-10-2025 15:29

Michel Hairaud Michel Hairaud

Bonjour à tous, Avec Elisabeth Stöckli nous avo

26-09-2025 15:51

Jean-Luc Ranger

Bonjour, voici un ascome poussant sur crotte de la

27-10-2025 19:51

Peter Welt Peter Welt

Who has this article? Doveri, F. 2007. Sporormiel

26-10-2025 13:39

Joaquin Martin

Hi,I found this fungus in a mixed forest of spruce

27-10-2025 10:05

Tripodi Mario

Hello everyone,on October 25th, 2025 I found this

26-10-2025 21:23

Juuso Äikäs

Hello, a couple weeks ago I found some pale, whit

26-10-2025 12:01

Louis DENY

Hello forum,Trouvé à Belfort (400m) sur tige her

23-10-2025 20:59

Patrice TANCHAUD

Bonsoir, est-ce que quelqu'un posséderait un com

24-10-2025 14:50

Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde, Oct. 2025

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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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