
17-09-2025 19:43
Philippe PELLICIERSur branche morte de Mélèze. Les ascospores sphÃ

17-09-2025 10:50
Heather MerryleesHi there!I am hoping for any advice on the identif

11-09-2025 16:57
Our revision of Marthamycetales (Leotiomycetes) is

16-09-2025 12:53
Philippe PELLICIERPézizes de 1-4 mm, brun grisâtres, sur les capsu

03-09-2025 12:44
Hi to somebody.I would like to know your opinion o

15-09-2025 14:40

Hello.I'm searching for a digital copy of the seco

14-09-2025 22:16
Philippe PELLICIERApothécies petites jusquà 3 mm, oranges, avec de

13-09-2025 14:01
Thomas Flammerdark brown apothecia, splitIKI-Spores biguttulate

The crater-like openings in the epidermis of the leaves are stunning under the microscope :-)
[EDIT]:
It was suggested that this corresponds better to Uromyces sp. due to the presence of aecia with pseudoperidium (Caeoma-aecia)Â that Melampsora euphorbiae usally lacks. See replies below.




no - Melampsora euphorbiae forms aecia (Caeoma type), the autoecical rust forms all 4(5) develompment stages on one host - compare for instance:
https://www.phytoparasiten.de/melampsora-euphorbiae-4/
Regards, Lothar



I will correct the title. I got a suggestion by Fabian Ernst of Uromyces tuberculosus which is cited to grow on E. peplus and E. exigua. I will seek further knowledge, but it is nice to learn new stuff here :-)
THANKS/Â

e.g.Â
https://bladmineerders.nl/parasites/fungi/dikarya/basidiomycota/pucciniomycotina/pucciniomycetes/pucciniales/pucciniales-incertae-sedis/aecidium/aecidium-euphorbiae/
I have an uprooted plant and two more, I will follow up. One of the plants is in its advanced state of infection so I will investigate further later on.Â

From what I read and learnt today, this would make my fungus Uromyces tuberculatus on the principle that Aecidium lacks completely the teliospore formation in its life cycle whereas U. tuberculatus grows specifically on E. exigua and forms verrucose teliospores.
However reading the host reaction (galling) of Aecidium euphorbiae on Euphorbia exigua, the symptms match perfectly to what I saw, thickened stems and leaves, erect growth, hypertrophy. Then, the same source (weblink above) says that U. tuberculatus rarely (does not) effects the host.
This makes things confusing, so unless we have double infection by two rust fungi (I think we can eliminate this possibility) the options are:
1. Uromyces tuberculatus but making an abnormal hypertropic reaction of the host OR
2. Aecidum euphorbiae but exceptionally is making teliospores on my sample.
I dont know what to choose between the two evils but 1 would be more realistic.


Yes we can conclude that this is Uromyces tuberculatus and that IT EFFECTS the host as explained above.Â
Great!Â