21/Aug/2026, 1:14 PM
Metsakalmistu, Tallinn, Harju, Eesti
Cemetery, near urban road, on affected maple leaves
59°28'06.7"N 24°52'05.4"E
🌡️ 20°C ⛅ Scattered clouds 💨 Wind 240° WSW->ENE, 11 km/h
Original Instagram postSawadaea bicornis
Maple Mildew
- Scientific identification
- Sawadaea bicornis (Wallr.) Homma
- Family
- Erysiphaceae
- Class
- Leotiomycetes
- Genus
- Sawadaea
Names across languages
- English: Maple Mildew
- German: Bergahorn-Mehltau
- Finnish: idänvaahteranhärmä
- Estonian: vahtra-jahukaste
- Russian: Савадея двурогая
The scientific profile
From the latest record: 2026-08-21.
Hymenium
No exposed macroscopic hymenium; asci develop inside dark chasmothecia, while white powdery colonies produce chains of conidia
Body
Thin white powdery patches on living maple leaves, often predominantly on the underside; colonies may become extensive, with minute dark brown to black chasmothecia appearing at maturity
Description
Spore mass white from conidia; mature chasmothecia dark brown to black
Description
Obligate biotrophic parasite on living leaves of maples (Acer spp.), including field, Norway, sycamore and other maples; white colonies may occur alone or merge across leaf surfaces; summer to autumn
Edibility
Inedible
Fruit body
Fruit body microscopic; powdery colonies may cover large areas of infected leaves
Dimensions
Chasmothecia ∅ ~150–180(–200) µm
Flesh
No true flesh; composed of superficial white septate mycelium on host tissues
Chemical reactions
No macroscopic reagents reaction
Odour
Indistinct
Microscopy
Macroconidia cylindrical-ellipsoid, hyaline, ~25–35 × 13–18 µm, with fibrosin bodies; microconidia ~12–18 × 5–12 µm; chasmothecial appendages hyaline, repeatedly dichotomously or occasionally trichotomously branched with curved to coiled tips; asci 6–12, 8-spored; ascospores hyaline, ~23–27 × 12.5–14 µm
Overview
White maple powdery mildew
1937). J. Fac. agric., Hokkaido Imp. Univ., Sapporo 38(3): 371.
Field encounters
Source hashtags
#sawadaeabicornis #fungiphotos #macro #plantpathogen #naturephotography #hongos #morchellaesculenta #morchella #yellowmorel #ümarmürkel #mürkel #pallohuhtasieni #speisemorchel #morchel #mushroomphoto #fungiphoto #fungimacro #seenefotod #pilzefotografieren #фотогрибов #sieniäkuvia #houby #mycology #fungistudy #mushroom #fungi #ascomycete #morel #pezizales #pilze
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