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21-07-2025 19:22

Orbilia nemaspora ...or aurantiorubra?
Ethan Crenson

Hello all,  Here is an Orbilia found by a friend

13-06-2025 09:41

Aquatic ascomycete.
Josep Torres Josep Torres

Hello.A cerebriform ascomycete sprouting scattered

14-07-2025 11:20

Une hélotiale sur Sphagnum palustre
Michel Hairaud Michel Hairaud

Bonjour, Voici une espèce de  (?) Hyaloscyphace

18-07-2025 23:03

Help with some conidia.
Josep Torres Josep Torres

Hello.Fruitings between 51 and 130 microns in tota

17-07-2025 11:55

Una para ID 833
Castillo Joseba Castillo Joseba

De ayer en bosque de hayas y abetos, en tieraEjemp

16-07-2025 17:34

Sphaerulina cornicola versus Septoria cornina
Bernard Declercq Bernard Declercq

Hello,I have trouble distinguishing above mention

15-07-2025 13:27

literature request
Angel Pintos Angel Pintos

Hello, does anyone have access to the following ar

16-01-2023 21:31

Troposporella fumosum => Troposporella monilipes
Riet van Oosten Riet van Oosten

Hello, Nearby the find of Calycina claroflava on

14-07-2025 17:55

Hypoxylon cf ticinense
Yanick BOULANGER

BonjourAutre dossier laissé en suspendJe viens de

14-07-2025 11:17

Jackrogersella minutella VS Hypoxylon cohaerens var. microsporum
Yanick BOULANGER

BonjourJ'ai un dossier Jackrogersella qui est rest

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Puccinia on Euphorbia cf maculata in the wild
Stephen Martin, 11-10-2020 07:26
Stephen MartinHi. I found a patch of Euphorbia cf maculata infested with a phytopathogenic fungus, most probably a Puccinia, but which one is specific to the chamaesyce group (Euphorbia). I saw a similar pic og P. media on a Euphorbia sp. - is it the same? Also P. levata in hawaii (eupharbia too) is close

http://www.hear.org/pph/images/16_097.htm
Thanks and best regards
S.
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Björn Sothmann, 11-10-2020 09:03
Björn Sothmann
Re : Puccinia on Euphorbia cf maculata in the wild
Hi Stephen,

in (Central) Europe, there is just one rust on Euphorbias of Sect. Chamaesyce: Uromyces proëminens. That also fits the teliospores with one cell in your sample (Puccinia has two-celled teliospores, furthermore there are no Puccinia on Euphorbia in (central) Europe.).

Best,

Björn
Stephen Martin, 11-10-2020 18:43
Stephen Martin
Re : Puccinia on Euphorbia cf maculata in the wild
Many thanks Bjorne. Very interesting information and likely it is first record for Malta. I will mention you if something gets published of course. Strange that it was found in the wild (close to cultivated area).  Mycobank suggests to use the taxon Uredo proëminens DC :
 https://www.mycobank.org/page/Name%20details%20page/528007

I dont know if you have a preference re taxonomy.

Attractive pathogen! I will later share few better photos from the card of the other camera in this post.

Thanks again
Stephen
Björn Sothmann, 13-10-2020 10:37
Björn Sothmann
Re : Puccinia on Euphorbia cf maculata in the wild
Hi Stephen,

Uredo is usually used as a form genus for rusts that are only known in the uredial stage and which cannot be assigned to any of the proper rust genera like Puccinia, Uromyces etc.

All current literature that I have available like Klenke & Scholler, Gäumann, Termorshuizen & Swertz use Uromyces as the proper genus for rusts on Euphorbia.

Best,

Björn
Stephen Martin, 14-10-2020 07:47
Stephen Martin
Re : Puccinia on Euphorbia cf maculata in the wild
Thank you for your reply. You are right! 

Best regards
S.