aeciumn.
/ˈiːsɪəm/, U.S. /ˈisiəm/ Mycology.
A fruiting body produced on the mycelium of a rust fungus at a particular stage in its life cycle (esp., in heteroecious species, that occurring on an alternate host), within which aeciospores are produced. Cf. aecidium n. 2.
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capsule1693
perithecium1800
aecidium1821
hymenium1830
pseudoperidium1832
pseudoperithecium1832
disc1842
trichidium1842
spicule1843
sporophore1849
stylospore1851
pycnide1856
cyst1857
pycnidium1857
basidium1858
cystidium1858
basidiospore1859
conidium1861
pollinarium1861
gonosphere1865
hymenophorum1866
spicula1866
teleutospore1866
promycelium1867
gonosphaerium1873
hymenophore1874
paracyst1874
sterigma1874
pollinodium1875
scolecite1875
uredospore1875
metuloid1879
operculum1879
uredo1879
aecidiospore1880
pycnidiospore1880
uredo-fruit1882
chlamydospore1884
teleutosorus1884
fruitcake1885
ascocarp1887
periplasm1887
pycnospore1887
pyrenocarp1887
macrostylospore1894
autobasidium1895
oidium1895
zygophore1904
aeciospore1905
aecium1905
pycniospore1905
teliospore1905
telium1905
uredinium1905
uredosorus1905
fruit-body1912
sporodochium1913
probasidium1916
fruiting body1918
pycnium1926
holobasidium1928
protoperithecium1937
uredium1937
1905 J. C. Arthur in Bot. Gaz. 39 221 For the sorus of the first spore-stage, usually..called aecidium, [etc.]..I propose aecium..derivatives aecial, aeciospore, etc.
1919 A. G. Johnson & J. G. Dickson Stem Rust of Grains 12 The single cluster cup, or so-called aecium, contains enough rust spores to sow rust over a 40-acre grain field.
1950 E. A. Bessey Morphol. & Taxon. Fungi xii. 397 In most of the short-cycled rusts studied..it has been shown that the mycelium is of monocaryon type until the telium or aecium is formed, when dicaryon cells appear.
2000 J. M. McPartland et al. Hemp Dis. & Pests (2006) v. 123/2 Aecia arise in pale leaf spots on undersides of lower leaves.
This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).
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n.1905