Uromyces excavatus (de Candolle) Magnus, 1847

on Euphorbia

gall

No host plant alternation. Spermogonia and aecia hypophyllous, uniformly dispersed all over the leaf. Uredinia missing. Telia hypophyllous, almost black, pustulate, sunken into the leaf tissue; spores one-celled; wall very finely verrucose, moreover in the upper half a sculpture of fine rods; apically a small, hyaline papilla. Infected plants are bushy, with short, broad, strongly thickened leaves.

hostplants

Euphorbiaceae, narrowly monophagous

Euphorbia flavicoma subsp. costeana, verrucosa.

synonyms

sometimes considered conspecific with U. tuberculatus.

notes

the fungus has been found sometimes together with the aecia of U. verrucosae-craccae.

references

Brandenburger (1985a: 339), Buhr (1964b), Gäumann (1959a), González-Fragoso (1925a), Klenke & Scholler (2015a), Pellicier (2001a), Termorshuizen & Swertz (2011a).

08/05/2017

mod 16.vii.2017