Melampsora laricis-populina Klebahn, 1902

on Larix

gall

see Caeoma laricis.

spermogonia, aecia

Poinaceae, monophagous

Larix decidua, kaempferi, sibirica.


on Populus

Melampsora laricis-populina: heavy infestation of  Populus x canadensis

Populus x canadensis, Nieuwendam: heavily infested tree, with healthy poplars in the background

Melampsora laricis-populina on Populus x canadensis

infested shoot

Melampsora laricis-populina: urediniosopre

urediniospore

Melampsora laricis-populina: paraphyse of uredinium

characteristically, the paraphyses of the uredinium have an extremely thick top wall

Melampsora laricis-populina on Populus x canadensis

Populus x canadensis, Harderbos © Hans Jonkman: upperside op the leaf with yellow uredinia and brown telia

Melampsora laricis-populina on Populus x canadensis

underside of the same leaf, with only uredinia

Melampsora laricis-populina: telia

telia under the stereo microscope

Melampsora laricis-populina: urediniospores

urediniosporen, at the top with thickened, spineless wall

Melampsora laricis-populina: uredinia on Populus balsamifera

Populus balsamifera, Zwanenwater: uredinia at the underside of the leaf

Melampsora laricis-populina: uredinium on Populus balsamifera

a singe, freshly erupted, uredinium

Melampsora laricis-populina: telia

telia

Melampsora laricis-populina: telium (section)

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 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)m Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Negrean (1997a), 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).

mod 21.ix.2017