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22-06-2024 13:35
Hello, Could this be Camposporium pellucidum? The
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16-06-2024 14:36
Hello.An anamorph located in nature, on the surfac
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23-06-2024 17:58
Bonjour, j'ai trouvé le Cheilymenia jaune vif sui
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09-01-2023 08:14
Ascomiceto anaranjado sobre suelo desnudo, 29/12/2
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15-07-2014 12:51
Gernot FriebesHi,identifying Lambertella species is difficult en
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21-06-2024 18:18
Sylvie Le GoffBonjourpourais je avoir confirmation pour Lachnum
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20-06-2024 16:07
Nicolas SuberbielleBonjour, J'ai trouvé cette espèce sur les feuil
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19-06-2024 18:32
François BartholomeeusenOn female Alnus catkins I found very small fruit b
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?
![Hans-Otto Baral](/uploads/user_vgn/Baral-0001.jpg)
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.
![Hans-Otto Baral](/uploads/user_vgn/Baral-0001.jpg)
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:
![Hans-Otto Baral](/uploads/user_vgn/Baral-0001.jpg)
![Zuzana Sochorová (Egertová)](/uploads/user_vgn/Egertova-0001.jpg)
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
![Hans-Otto Baral](/uploads/user_vgn/Baral-0001.jpg)
![Zuzana Sochorová (Egertová)](/uploads/user_vgn/Egertova-0001.jpg)
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
![Hans-Otto Baral](/uploads/user_vgn/Baral-0001.jpg)