07/Jun/26, 2:48 PM
Vahiküla joastik, Vahi, Harju, Eesti
River bank, on Salix sp. tree, on female catkins and leaves
59°22'41.2"N 24°28'03.6"E
🌡️ 20°C ☀️ Sunny 💨 Wind 220° SW->NE, 19 km/h
Original Instagram postMelampsora ari-salicina
willow rust fungus
- Scientific identification
- Melampsora ari-salicina A. Raabe
- Family
- Melampsoraceae
- Class
- Pucciniomycetes
- Genus
- Melampsora
Names across languages
- English: willow rust fungus
- German: Weiden-Rost
- Russian: Мелампсора ивовая
The scientific profile
From the latest record: 2026-06-07.
Hymenium
Not formed as a cap-and-gill structure; spores produced in rust sori on infected willow leaves
Body
Microscopic rust fungus forming yellow-orange uredinia, later dark brown to black telia on leaves of Salix species
Hymenium Attachment
Not applicable; spore-producing sori erupt through or develop within host leaf tissue
Stipe
N/A
Ecology
Ecology obligate biotrophic parasite on willows (Salix spp.); uredinia reinfect willow leaves during the growing season, telia develop later in summer to autumn
Edibility
Inedible, microscopic plant pathogen
Fruit body
Fruit body microscopic; visible only as small rust pustules or dark telial patches on leaves
Dimensions
Sori usually minute, appearing as yellow-orange to brown-black spots or patches on willow leaves
Flesh
No true flesh; infected leaf tissue may yellow, spot, brown or distort
Microscopy
Urediniospores one-celled, yellowish, finely echinulate to spiny; teliospores formed in dark telia on willow leaves
Overview
Willow rust producing yellow-orange summer sori and later dark telia on Salix leaves
Taxon list of fungi and fungal-like organisms from Germany compiled by the DGfM
Field encounters
Source hashtags
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