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24-12-2025 17:08

Propolis sp. on Picea abies
Hulda Caroline Holte

Hello, I have found this propoloid ascomycete on

23-12-2025 11:27

blanc poilu
Louis DENY

bonjour forum,sur débris de bois de feuillu (acer

20-12-2025 10:49

Small resin asco?
Mirek Gryc

Hi. „I doubt it is possible to identify this ti

23-12-2025 08:27

Hymenoscyphus?
Josep Torres Josep Torres

Hello.Small, yellowish ascomata, with very short a

21-12-2025 09:32

Spherical Pyrenomycete
Josep Torres Josep Torres

Hello.A tiny ascomycete found embedded in wood in

21-12-2025 21:32

Anamorf on decaying leaves of Euonymus japonicus 'Microphyllus'
Pol Debaenst

Hello, Garden, Burgweg 19, Veurne, BelgiumOn 10/1

22-12-2025 23:38

Phylloscypha labessiana ?
Patrice TANCHAUD

Bonsoir, récolte sur un mur en pierre, apothéci

21-12-2025 12:34

Nectria ??
Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

22-12-2025 00:47

Phylloscypha boltonii
Patrice TANCHAUD

Bonsoir, récolte à proximité du milieu dunaire

21-12-2025 21:40

recherche de références biblio
Isabelle Charissou

Bonjour, j'aimerais connaitre les références de

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Ceuthospora cf. mahoniae
Riet van Oosten, 09-03-2019 18:40
Riet van Oosten
Hello,

Found by Laurens van der Linde, on Berberis vulgaris


Could this be Ceuthospora mahoniae?

The size of the conidia doesn't quite fit, 13.6-16.4 x 2.3-2.4 µm

This species in Microfungi on Land Plants, page 162, under Mahonia (Oregon Grape) = family Berberidaceae.

Ellis & Ellis: "Conidiomata multiocular, black, with a central pore. Conidia hyaline, 10-14 x 1.5-2. On dead leaves, Mar.-Apr."

Greetings, Riet
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Chris Yeates, 09-03-2019 19:28
Chris Yeates
Re : Ceuthospora mahoniae
Hello Riet

There are many problems with these "Coelomycetes" and it is often not easy to assign every collection to a reliable name.

One problem is that in the past form-species occurring on different host genera or families were often considered to be different species, even if morphology was not very different. How many "good" Ceuthospora spp, there are is therefore uncertain. What is needed is molecular work to sort out the actual different taxa, and then hopefully morphological characters to differentiate them for field workers will emerge.

I'm attaching the relevant page from W.B. Grove's "Stem & Leaf Fungi"; he described Ceuthospora mahoniae and this will have been where Ellis and Ellis got those conidial measurements from. In my experience Grove's measurements are fairly reliable. I would record this as Ceuthospora cf. mahoniae Grove.

Hope that helps a little bit

Chris
Riet van Oosten, 09-03-2019 20:05
Riet van Oosten
Re : Ceuthospora mahoniae
Hello Chris,
Thank you for your help and explanation! 

Chris Yeates, 11-03-2019 19:03
Chris Yeates
Re : Ceuthospora mahoniae
Here is the original description from Journal of Botany vol. 56 (1918):
Riet van Oosten, 11-03-2019 21:44
Riet van Oosten
Re : Ceuthospora mahoniae
Very nice Chris, thank you!