
02-07-2025 18:45
Elisabeth StöckliBonsoir,Sur feuilles d'Osmunda regalis (Saulaie),

02-07-2025 17:26
Yanick BOULANGERBonjourRécolté sur une brindille au fond d'un fo

02-07-2025 09:32

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

30-06-2025 16:56
Lydia KoelmansPlease can anyone tell me the species name of the

01-07-2025 23:37
Hello.A Pleosporal symbiotic organism located and

30-06-2025 12:09

This tiny, rather "rough" erumpent asco was found

30-06-2025 06:57
Ethan CrensonHi all, Another find by a friend yesterday in Bro

30-06-2025 14:45

This is a quite common species on Nothofagus wood

25-06-2025 16:56
Philippe PELLICIERBonjour, pensez-vous que S. ceijpii soit le nom co
Spore measurements:
(13.5) 14.6 - 17.6 (18.1) × (2.8) 3.2 - 4 (4.2) µm
Q = (3.4) 3.9 - 5.3 (5.8) ; N = 20
Me = 15.9 × 3.6 µm ; Qe = 4.5
The old paper The genus Mitrula in North America (1977) doesn't seem to clearly key out this specimen. Either this is M. paludosa or M. borealis. The spore measurements would fit M. borealis slightly better, but the spores didn't appear to have a sheath (fresh spore deposit), which might favour M. paludosa.
Any opinions?

Mitrula borealis seems to be very common in SW Finland, perhaps more so than M. paludosa. Some of my observations are recorded here, but I have many more:
https://laji.fi/observation/list?target=mitrula%20borealis
A few weeks ago I collected a Mitrula with spores even broader than borealis according to the Redhead paper. I don't know is it a borealis or still a new one.

About macroscopic differences I am not sure but the working hypothesis is that borealis is more yellow and perhaps bigger. Paludosa might have more brownish tints in the hymenium and pehaps not so elongated hymenial head as borealis.
Likewise, about ecology I have only a working hypothesis: borealis might be more common in spring fed small streams or pools while paludosa is found in any pool or ditch. All acid, virtually no calacreous sites where I collect.
The sequenced one is this:


interesting topic! I must admit I have automatically identified all my Czech collections as M. paludosa. In Czech literature, I haven´t found a mention about M. borealis, but I can see that Redhead mentions occurrence in the neighbouring Germany.
I wonder how often is M. borealis collected in this region...
Yesterday I found Mitrula in the Jeseníky Mts., so I made the first microscopy of it in my life, and it fits better M. paludosa, especially if Redhead worked with dead material. In any case, the are thinner than those in the collections from Finland presented here. Living ascospores measure (13)14.1-18.2(19.2) × (2.8)3-3.6 (3.8) µm, Q = (3.8)4.2-5.6(6.2), n = 40. Me = 15.8 × 3.3 µm; Qe = 4.8. Gelatinous sheath not observed.
Best regards, Zuzana


Spores:
(17.3) 18.1 - 21.3 (22.9) × (2.8) 3 - 3.5 (3.8) µm
Q = (4.6) 5.4 - 6.7 (6.8) ; N = 20
Me = 19.6 × 3.3 µm ; Qe = 6
