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17-07-2024 22:37

Peter Welt Peter Welt

Who can help? Arx, J.A. von. 1973. Ostiolate and

16-07-2024 18:32

Andgelo Mombert Andgelo Mombert

Bonsoir, Un discomycète sur Liochlaena lanceolat

17-07-2024 16:29

Andgelo Mombert Andgelo Mombert

Hello,A colleague found an unknown fungus on the s

17-07-2024 10:53

Hans-Otto Baral Hans-Otto Baral

I have a question about the scaling of illustratio

17-07-2024 08:35

Peter Welt Peter Welt

Who can help? Malloch, D.; Hubart, J.-M. 1987. An

17-07-2024 11:33

Angel Pintos Angel Pintos

Hello, anybody body has:Pande A. and Rao, V.G. (1

11-01-2022 16:36

Jason Karakehian Jason Karakehian

Hi does anyone have a digital copy of Raitviir A (

24-08-2020 13:00

Yulia Lytvynenko Yulia Lytvynenko

Dear friends.Looking for a copy of the following w

11-07-2024 14:29

Viktorie Halasu Viktorie Halasu

Hello, a thin-fleshed Mollisia on a monocot stem

15-07-2024 10:38

Joaquin Martin

Hi, I found this Ascobolus in company of Cheilyme

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Rhytidhysteron dissimile ?
Ethan Crenson, 08-02-2018 06:17
In New York City on unknown decorticated hardwood.  Can this be Rhytidhysteron dissimile?  The fruiting bodies are hysterioid, black about 1mm long.  They open slightly when hydrated.  Asci 115-133 by 22-28µm.  Brown ascospores 5-8 septate (?) with 2 or more longitudinal septae, 30-38 by 10-12.5µm.  The fertile surface appears to contain purple pigmented material around the asci.  When crushed in KOH the extractable pigments are a blue-green-gray color.  I don't have a good description of R. dissimile available to me so if anyone has one and can send it to me I'd really appreciate it.   Thanks in advance!
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Alain GARDIENNET, 08-02-2018 07:13
Alain GARDIENNET
Re : Rhytidhysteron dissimile ?
See attached pieces
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Ethan Crenson, 08-02-2018 07:18
Re : Rhytidhysteron dissimile ?
Thank you, but I'm afraid the text is small and my German even smaller.  From the illustrations of asci and spores, it doesn't appear to be a very good match, does it?
Alain GARDIENNET, 08-02-2018 10:40
Alain GARDIENNET
Re : Rhytidhysteron dissimile ?
Yes, I agree. Did you compare with hysteriaceae, like brown-spored Hysterobrevium, Hysterographium or Hysterium species ?
Alain
Ethan Crenson, 08-02-2018 14:03
Re : Rhytidhysteron dissimile ?
Alain,
I had not considered them because it seems to me that these hysterothecia open when hydrated.  The first and second photos that I posted show the difference, with the second showing the hysterothecia after they have been wet for about 1/2 hour.  Eric Boehm's key describes R. dissimile:  Ascospores with five or more septa ... but does not provide an illustration or a description.  Is it possible for species in Hysterobrevium, Hysterographium or Hysterium to open to the degree that these do?
Thanks,
Ethan
Alain GARDIENNET, 09-02-2018 09:21
Alain GARDIENNET
Re : Rhytidhysteron dissimile ?

 You ask : Is it possible for species in Hysterobrevium, Hysterographium or Hysterium to open to the degree that these do?


Probably not impossible.


 In Ellis & Everhart (1892), we ca read about H. vulvatum (syn. in 2018 :  H. flexuosum): "Hysterothecia erumpent-superficial, scattered or gregarious, 1-3mm long, straight or flexuous; lips at first closed, then open so as to leave a wide furrow between them, mostly with 1-2 deep striae on each side, often apparently double i.e., with one set within another."


Personnaly, I observe that with H. mori : http://www.ascofrance.fr/search_recolte/2861


Make a difference between Rhytidhysteron and other Hysteriaceae without molecular data is not always so easy.


Good luck !


Alain


 


 


 

Ethan Crenson, 05-06-2024 22:06
Re : Rhytidhysteron dissimile ?
I am resurrecting this six-year-old discussion because I have an update, including a possible ID for this Hysterioid (definitely not Rhitidhysteron).

Since 2018 I have occasionally come across this Hysterioid with purple pigments in the centrum, mostly in the Northeastern US, but also in Appalachian North Carolina. I found it in Staten Island NYC a few weeks ago.


It appears this is similar to Hysterographium minus. Boehm in the 2009b paper wasn't able to get sequence data for 4 species purported to be Hysterographium including Hg. minus, and left them as species of Hysterographium... "until such time that sequence data are available".


There is a single ITS sequence in GenBank for something labeled Hg. minus, but my collection's sequence does not match it very closely.


I missed the significance of the green extractable pigments back in 2018 (last photo in my original post). When mounted in 3% KOH the purple pigments become green. In the description for Hg. minus Amano says:


"Asci bitunicate...in 2% KOH staining pale green or greenish white, staining more intensely above" but doesn't explicitly mention purple pigments in the centrum.


Jayasiri and Hyde et. al. transferred Hg. minus to the genus Purpurepithecium, and say:
"Hysterographium minus is morphologically similar to Purpurepithecium murisporum in having pigmented dictyospores with a brick-red epithecium." Brick-red? So perhaps I don't have a match... or perhaps it is a problem in the interpretation of colors... or perhaps the color temperature of the light from my microscope makes my collection look purple?


For my most recent collection from Staten Island:
Asci: 73-75 x 19-21µm, the collection may have been over mature and there were not many asci available.


Spores:
5-9 septate with multiple vertical septa.
30.8-39.5 x 11.3-16.4µm
Me 35 x 13.9µm
Q 2.3-2.9
Qe 2.5
N=10


Lastly, I wonder if this Hg. minus is ever found by anyone else here on AscoFrance? Alain? is this one you have seen?


Ethan

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