
23-09-2025 13:31
Thomas Læssøehttps://svampe.databasen.org/observations/10534623

15-10-2025 16:39

These tiny (0.2-0.6 mm), white, pulvinate apotheci

03-10-2025 13:44

Hello, Found by Laurens van der Linde on Populus

13-10-2025 19:05
Louis DENYBonjour forumSur tronc décortiqué de feuillu x,

11-10-2025 20:27

Found on a barked branch, 14 mm in diameter, of Ro

09-10-2025 22:14
S. RebeccaWe just had the Bavarian Mycology Conference in Au

10-10-2025 00:49
Ethan CrensonHello all, This was found last weekend on a hardw
Lophiostoma myriocarpum
Chris Yeates,
06-10-2014 20:36

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