Gymnosporangium asiaticum Miyabe 1904

japanse pear rust

aecia on woody Rosaceae

Gymnosporangium cf. asiaticum on Crataegus

Crataegus spec., North Macedonia, National Park Galičica (Resen), oak forest, 1100 m a.s.l., 30.vii.2019 © Cor Zonneveld

Gymnosporangium cf. asiaticum on Crataegus

complexes of aecia on the leaves

Gymnosporangium cf. asiaticum on Crataegus

aecia ob the twigs

Gymnosporangium cf. asiaticum on Crataegus

another image

Gymnosporangium cf. asiaticum on Crataegus

Crataegus spec., North Macedonia, National Park Galičica, 1410 m a.s.l., 1.viii.2019 © Cor Zonneveld

Gymnosporangium cf. asiaticum on Crataegus

in this material the peridia are shorter and less curved

spermogonia, aecia

Aecia in groups on swollen parts of the leaves or shoots; peridium long and slender, strongly curved, not fraying at the tip.

host plants

Rosaceae, oligophagous

Cydonia oblonga; Pyrus ? communis, pyrifolia; Chaenomeles; ? Crataegus.


telia on Juniperus

telia

When moist light orange yellow, up to 2 cm elongated gelatinous lumps, attached to the needles.

host plants

Cupressaceae, monophagous

Juniperus chinensis, procumbens.

notes

The identification of the pictures above is far from definite. From Europe only a few observations G. asiaticum are known, in gardens and based on telia. Moreover, in the literature hawthorn is listed only with hesitation as a host plant. Julia Kruse (in mail to Cor Zonneveld) rather thinks of G. clavariiforme.

references

Brandenburger (1985a: 29), Cheraghian (2019a), Henderson (2000a, 2004a), Klenke & Scholler (2015a), Lehmann (0000a), Poelt & Zwetko (1997a), Redfern & Shirley (2011a), Yun, Hong, Rossman ao (2009a), Zhao, Liu, Li & Cai (2016a).

mod 30.viii.2019