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22-05-2024 23:39

Marc Detollenaere Marc Detollenaere

Dear Forum,On debarked Fagus I found some small wh

21-05-2024 17:48

Karl Soler Kinnerbäck

Hi all,Could this be Venturioscypha or Venturiocis

21-05-2024 11:33

Nihad Omerovic

Hello,found on dead, dry, attached (and fallen) tw

07-11-2018 08:34

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello, could someone send this publication to me

21-05-2024 09:15

Pierre Repellin

Bonjour à tous,L'ouvrage de Björn Wergen: Handbo

21-05-2024 16:12

Thomas Flammer

Substrate: not quite sure, on pluvious stem of a h

21-05-2024 11:13

Ursula Kozik

Hallo und guten Tag, habe eine Frage zur Farbe ei

17-05-2024 16:25

Pavel Jiracek

Erioscyphella lunata, found on a fallen needle of

20-05-2024 21:28

Nihad Omerovic

Hello,Found this Orbilia on a dry, attached twig o

18-05-2024 10:47

Anna Klos

Goodmorning,We found this tiny ascomycete (max. 1m

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Microstoma from South Korea
Zuzana Sochorová (Egertová), 22-04-2024 11:52
Zuzana Sochorová (Egertová)Hello,
I made a loan of a collection of Microstoma from South Korea.
For the beginning, I have used the key to the genus by Tie-Zhi et al. 2018 - it´s in Chinese, so I translated it to English using Google Translator - of course this can have some limits, nevertheless, I led me to M. floccosum.

However, in 2021, another species which could be a good candidate was described from Japan - M. longipilum.


According to Tochigara et al. 2021, the main differences should be the colour of apothecia (scarlet or dull red in M. floccosum, salmon pink to pale orange in M. longipilum) and lenght of hairs (but this is a bit unclear to me: "over 1000 micrometers" in M. floccosum, while "up to 3000 micrometers, usually over 1500 micro" in M. longipilum). Some sources give only "up to 1000 micrometers" for hairs in M. floccosum.


I am attaching photos of dry apothecia - in them, I would say the colour fits better for M. longipilum. Also the aggregared growth would be OK for M. longipilum. Note the brown hyphae at the base of apothecia. A photo of fresh apothecia, taken by the collector, can be found in this presentation, in time 28:40: https://www.youtube.com/watch?v=WmtAD5YM4LA


Hairs are often over 1500 micrometers, the longest hair I measured was 1875 micrometers long.


Ascospores in the South Korean collection were (20.2)21.7-26.5(28) × (10.8)11.6-12.5(13.1) µm, Q = 1.8-2.4, n = 55. Me = 23.9 × 12 µm; Qe = 2 (but this cannot help too much, because size of ascospores is overlapping in the two species). The have no apiculi.


What´s your opinion? There are many photos of M. floccosum in the internet, some also having pinkish colour, but I think it cannot be excluded some are wrongly identified.
Zuzana

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Zuzana Sochorová (Egertová), 22-04-2024 12:00
Zuzana Sochorová (Egertová)
Re : Microstoma from South Korea
Hairs - they dissolve in 3% KOH rather quickly. They are pointed.
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Zuzana Sochorová (Egertová), 22-04-2024 12:02
Zuzana Sochorová (Egertová)
Re : Microstoma from South Korea
Hairs 2
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Zuzana Sochorová (Egertová), 22-04-2024 12:06
Zuzana Sochorová (Egertová)
Re : Microstoma from South Korea
Asci, ascospores
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Nicolas VAN VOOREN, 22-04-2024 14:26
Nicolas VAN VOOREN
Re : Microstoma from South Korea
As you noted Zuzana, many collections of M. floccosum shown on Internet may be misidentified.
About the colour, of course, the density of carotenoid pigments can vary and change the global aspect, including with exsicata.
Maybe the biogeography could also help. M. floccosum was first discovered in North America, so Asian collections should be revised. The phylogeny published in the paper introducing M. longipilum shows clearly that Japanese and Chinese collections named M. floccosum belong to a sister clade of North American collections.

Zuzana Sochorová (Egertová), 22-04-2024 18:32
Zuzana Sochorová (Egertová)
Re : Microstoma from South Korea
It's true.
It seems it will not be possible to make a clear conclusion without sequencing.
I should have made this loan three years ago, and wouldn't have problems with identification like now ????
Zuzana Sochorová (Egertová), 23-04-2024 19:00
Zuzana Sochorová (Egertová)
Re : Microstoma from South Korea
The collector, dr. Vladimir Antonin, gave me a permission to show his photo of fresh apothecia in this forum, so I am adding it, although it will probably not change the situation.
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