
18-07-2025 23:03
Hello.Fruitings between 51 and 130 microns in tota

16-07-2025 17:34

Hello,I have trouble distinguishing above mention

14-07-2025 11:20

Bonjour, Voici une espèce de (?) Hyaloscyphace

16-01-2023 21:31

Hello, Nearby the find of Calycina claroflava on

14-07-2025 17:55
Yanick BOULANGERBonjourAutre dossier laissé en suspendJe viens de

14-07-2025 11:17
Yanick BOULANGERBonjourJ'ai un dossier Jackrogersella qui est rest

14-07-2025 15:52
Gernot FriebesHi,I wanted to share this collection on Rubus idae

14-07-2025 13:37
Gernot FriebesHi,do you think this collection could be R. ulmari
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