Gymnosporangium asiaticum Miyabe 1904

japanse pear rust

aecia on woody Rosaceae

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

complexes of aecia on the leaves

aecia ob the twigs

another image

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

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.

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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).