Melampsora laricis-populina Klebahn, 1902
on Larix
gall
see Caeoma laricis.
spermogonia, aecia
Pinaceae, monophagous
Larix decidua, kaempferi, sibirica.
on Populus
Populus x canadensis, Belgium pov. East Flanders, banks of the Dender, 15.viii.2021 © Paul Fontaine; upper side of an infected leaf; the epiphyllous telia are recognisable as tiny brown spots
underside of the leaf with uredinia
all trees as seriously affected
Populus x canadensis, Nieuwendam, 21.viii.2012: heavily infested tree, with healthy poplars in the background
infested shoot
urediniospore
characteristically, the paraphyses of the uredinium have an extremely thick top wall
Populus x canadensis, Harderbos, 5.ix.2017 © Hans Jonkman: upperside op the leaf with yellow uredinia and brown telia
underside of the same leaf, with only uredinia
telia under the stereo microscope
urediniosporen, at the top with thickened, spineless wall
Populus balsamifera, Zwanenwater: uredinia at the underside of the leaf
a singe, freshly erupted, uredinium
telia
Populus carolinensis, from González-Fragoso (1925a): telium (section)
gall
uredinia mainly hypophyllous, 1 mm, yellow, without a peridium, with club-shaped paraphyses that apically are very thick-walled. The corresponding upperside of the leaf has angular yellow spots, delimited by the leaf venation. Urediniospores finely echinulate, apex smooth. Telia epiphyllous, subepidermal, dark brown, spores here positioned like basalt columns, thin-walled, also apically.
uredinia, telia
Salicaceae, monophagous
Populus balsamifera, x berolinensis, x canadensis, carolinensis, deltoides & var. occidentalis, laurifolia, nigra & var. italica, simonii, trichocarpa.
synonyms
Most authors write “larici-populina”, but the Index Fungorum (2013) “laricis-populina”.
references
Blumer (1946a), Brandenburger (1985a: 18, 38), Doppelbaur & Doppelbaur (1973a), Ellis & Ellis (1997a), European and Mediterranean Plant Protection Organization (2009a), Gäumann (1959a), González-Fragoso (1925a), Henderson (2000a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse, Thiel, Choi, ao (2016a), Moraal (1988a), Negrean (1997a), Ostry, Ramsted, Newcombe & Steenackers (2014a), Poelt & Zwetko (1997a), Riegler-Hager (2007a), Spooner & Butterfill (1999a), Termorshuizen & Swertz (2011a), Tykhonenko (2010a), Vanderweyen & Fraiture (2007a), Vialle, Frey, Hambleton, Bernier & Hamelin (2011a), Wilson & Henderson (1966a), Woods, Stringer, Evans & Chater (2015a).