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27-03-2026 10:47

Stictis cf. friabilis and literature request
Ã…ge Oterhals

I have tentatively identified this Stictis to S. f

28-03-2026 07:55

White Orbilia with allantoid spores
Marc Detollenaere Marc Detollenaere

Hello everybody,Yesterday I found a number of whit

26-03-2026 15:31

Hymenoscyphus ombrophiliformis?
Ã…ke Widgren Ã…ke Widgren

Hello,I found this one in October last year, on r

27-03-2026 15:23

Trichopezizella barbata?
Gernot Friebes

Hi,this Trichopezizella deviates from typical T. b

25-03-2026 10:35

Encoelia impudicella?
Hulda Caroline Holte

Hello,I collected this species growing on a dead b

27-03-2026 15:08

Coelomycete on Cirsium
Gernot Friebes

Hi,I'm looking for help with this coelomycete on C

24-03-2026 21:37

Helminthosphaeria
Elisabeth Stöckli

Bonsoir,Sur bois (tronc) très pourri de conifère

26-03-2026 12:50

Pseudombrophila
David Chapados David Chapados

Hi,I'm having a hard time figuring which Pseudombr

26-03-2026 11:17

asco in Ulmus
Vasileios Kaounas Vasileios Kaounas

Found 11-03-26, in leaf of Ulmus sp. Diameter 2-4

25-03-2026 22:23

Orbilia with resin deposits
Marc Detollenaere Marc Detollenaere

Dear Forum,On a debarked stem of Tilia, we found s

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Hysterium hyalinum
Ethan Crenson, 28-09-2017 05:06
Collected recently in Vermont in the Green Mountains.  I believe this is Hysterium hyalinum.  It is on a decorticated hardwood branch (along with Berkleasmium conglobatum and a Patellarioid asco which I posted earlier.)  Long naviculate hysterothecia with an apical slit.  They are mostly flattened at the apex.  The longest of them are 2-2.5mm long and slightly less than .5mm wide.

Spores are hyaline at first and eventually brown. Mostly 3 septate, constricted at the sepatations.  20-25 x 7.5-9µm. 

Asci are 92-110 x 15-17µm. 

This seemed to key out to H. hyalinum using Boehm's key and matched fairly well with information from Marion Lohman, "A Cultural and Taxonomic Study of Hysterium hyalinum". 
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Hans-Otto Baral, 28-09-2017 07:57
Hans-Otto Baral
Re : Hysterium hyalinum
The name hyalinum could refer to the spores beeing obviously shot when still hyaline, judging from the living, seemingly mature asci on your photos. In your Haematomyxa this is unclear as you did not see living asci, while in my collection the spores were faintly coloured when still inside the living asci.