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05-03-2026 10:07

White apothecia on pine cone
Hulda Caroline Holte

Hello, I found and collected this species growing

14-03-2026 13:51

Phylloscypha sp
Thierry Blondelle Thierry Blondelle

Hi everybody Under Quercus ilex, i hesitate to na

12-03-2026 19:44

Ostropoloid fungus on Hibiscus
Enrique Rubio Enrique Rubio

Hi to everybody.Can you give me any suggestions ab

11-03-2026 17:36

Help for Genus and Species ID
Michel Hairaud Michel Hairaud

Bonjour, Je cherche des indices  pour cette réc

12-03-2026 15:45

Dematioscypha cf. olivacea
Åge Oterhals

Dear forum,I found this small discomycete on a ver

08-03-2026 14:05

Helvella lacunosa
Thierry Blondelle Thierry Blondelle

Bonjour à tous,Sur 3 récoltes supposées de H. l

12-03-2026 16:17

Mollisia atlantica
Sylvie Le Goff

Bonjour à tousRécolté dans le 22 en France (ré

12-03-2026 14:37

Octospora
David Wasilewski

These small ascomycota (1-3 mm) ere observed growi

11-03-2026 16:48

Saccobolus minimoides ?
Bruno Coué Bruno Coué

Bonjour, je serais heureux d'avoir votre avis sur

09-02-2026 22:01

Sp
ruiz Jose

Hola, me paso esta colección en madera de pino, t

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Karstenia rhopaloides?
Ethan Crenson, 01-12-2024 19:58
Hi all,

Found yesterday by a friend in a wooded park in the Bronx, NYC, on a fallen branch of hardwood (Quercus, Liquidambar, Liriodendron and Prunus are common in those woods).  

Clearly erumpent through the bark with a grayish hymenium.  Spores are clavate and 4-9 septate. They seem fragile, prone to breaking. 19.5-38.1 x 4.8-6.3µm.

Asci and paraphyses surrounded by a glutinous epithecium which stains blue-green in IKI. Because of the staining of the epithecium it is difficult to tell if the ascus tip blues as well. Still working on that.

Paraphyses slightly constricted at the septa, ends clavate or swollen.

My sense is that this is Karstenia rhopaloides. The spores seem too narrow for K. lonicerae.  But maybe rhopaloides is a European species that would not occur in the Bronx?

Ethan
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Hans-Otto Baral, 01-12-2024 21:17
Hans-Otto Baral
Re : Karstenia rhopaloides?
A section of the marginal lobes should show periphysoids that also extend on the sides of the hymenium (unlike Cryptodiscus), but I would exclude that genus also without seeing this feature.

I assume you meant K. lonicerae has narrower spores.

I mainly know that an apical ring reacts blue and the outer ascus wall hemiamyloid (blue then red during iodine diffusion), not the exudate/epithecium.
Ethan Crenson, 02-12-2024 04:21
Re : Karstenia rhopaloides?
Thank you... yes I did mean K. lonicerae has narrower spores. I will call this K. rhopaloides.  It seems fairly safe to do that.