Interactions where Helleborus niger is the victim or passive partner (and generally loses out from the process)
The following relationships have been collated from the published literature (see 'Interaction References').
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Affected Part
Summary
Taxon
Vernacular
Classification
References
Darwin Classification of Active Taxon
Active Taxon
Active Vernacular
Active Taxon Uncertain
Active State
Active Part
Active Stage
Relationship
Relationship Uncertain
Relationship Geography
Darwin Classification of Passive Taxon
Passive Taxon
Passive Vernacular
Passive Taxon Uncertain
Passive State
Passive Part
Passive Stage
Passive Taxon's significance to Active Taxon
Indoors etc
Season
Summary
foliage (small, crisped, grey-brown)
small, crisped, grey-brown foliage may be infected and damaged by sporangium
Peronospora pulveracea a downy mildew
Peronosporales: Peronosporaceae
Microfungi on Land Plants: An Identification Handbook , Ellis, M.B. & J.P., 1997Peronospora pulveracea , Hall, G., 1944A Checklist of the Downy Mildews (Peronosporaceae) of the British Isles , Preece, T.F., 2002
/Chromista/Oomycota/Peronosporea/Peronosporales/Peronosporaceae/Peronospora pulveracea/ Peronospora pulveracea a downy mildew sporangium
Foodplant / pathogen UK and/or Eire
/Plantae/Tracheophyta/Magnoliopsida/Ranunculales/Ranunculaceae/Helleborus niger/ Helleborus niger Christmas rose small, crisped, grey-brown foliage sporangium infects and damages small, crisped, grey-brown foliage
leaf (fading)
fading leaf is spotted by epiphyllous pycnidium of Coniothyrium coelomycetous anamorph
Microsphaeropsis hellebori Hellebore Leaf Spot - causative organism
Pleosporales: Montagnulaceae
Pests, Diseases & Disorders of Garden Plants , Buczacki, S. & Harris, K., 1998Fungi of the South East England , Dennis, R.W.G., 1995British Stem- and Leaf- Fungi: Coelomycetes Vol. II … Sphaeropsidales (rest) + Melanconiales , Grove, W.B., 1937British Parasitic Fungi , Moore, W.C., 1959
/Fungi/Ascomycota/Dothideomycetes/Pleosporales/Montagnulaceae/Microsphaeropsis hellebori/ Microsphaeropsis hellebori hellebore leaf spot - causative organism epiphyllous pycnidium Coniothyrium coelomycetous anamorph
Foodplant / spot causer UK and/or Eire
/Plantae/Tracheophyta/Magnoliopsida/Ranunculales/Ranunculaceae/Helleborus niger/ Helleborus niger Christmas rose fading leaf (1-9) epiphyllous pycnidium of Coniothyrium coelomycetous anamorph causes spots on fading leaf
leaf (live)
live leaf is spotted by amphigenous caespituli of Ramularia anamorph
Ramularia hellebori an anamorphic fungus
Capnodiales: Mycosphaerellaceae
Monograph of Cercosporella, Ramularia and Allied Genera - Vol II , Braun, U., 1998
/Fungi/Ascomycota/Dothideomycetes/Capnodiales/Mycosphaerellaceae/Ramularia hellebori/ Ramularia hellebori an anamorphic fungus amphigenous caespituli Ramularia anamorph
Foodplant / spot causer Foreign
/Plantae/Tracheophyta/Magnoliopsida/Ranunculales/Ranunculaceae/Helleborus niger/ Helleborus niger Christmas rose live leaf amphigenous caespituli of Ramularia anamorph causes spots on live leaf
leaf (live)
live leaf has leaves shot holed by Microsphaeropsis coelomycetous anamorph
Microsphaeropsis hellebori Hellebore Leaf Spot - causative organism
Pleosporales: Montagnulaceae
Hellebore leaf spot
/Fungi/Ascomycota/Dothideomycetes/Pleosporales/Montagnulaceae/Microsphaeropsis hellebori/ Microsphaeropsis hellebori hellebore leaf spot - causative organism Microsphaeropsis coelomycetous anamorph
Foodplant / shot hole causer UK and/or Eire
/Plantae/Tracheophyta/Magnoliopsida/Ranunculales/Ranunculaceae/Helleborus niger/ Helleborus niger Christmas rose live leaf Major
(late winter to summer) Microsphaeropsis coelomycetous anamorph causes shot holes on live leaf
leaf (live)
live leaf is spotted by Microsphaeropsis coelomycetous anamorph
Microsphaeropsis hellebori Hellebore Leaf Spot - causative organism
Pleosporales: Montagnulaceae
Hellebore leaf spot
/Fungi/Ascomycota/Dothideomycetes/Pleosporales/Montagnulaceae/Microsphaeropsis hellebori/ Microsphaeropsis hellebori hellebore leaf spot - causative organism Microsphaeropsis coelomycetous anamorph
Foodplant / spot causer UK and/or Eire
/Plantae/Tracheophyta/Magnoliopsida/Ranunculales/Ranunculaceae/Helleborus niger/ Helleborus niger Christmas rose live leaf Major
(late winter to summer) Microsphaeropsis coelomycetous anamorph causes spots on live leaf
stem (live)
live stem is spotted by Microsphaeropsis coelomycetous anamorph
Microsphaeropsis hellebori Hellebore Leaf Spot - causative organism
Pleosporales: Montagnulaceae
Hellebore leaf spot
/Fungi/Ascomycota/Dothideomycetes/Pleosporales/Montagnulaceae/Microsphaeropsis hellebori/ Microsphaeropsis hellebori hellebore leaf spot - causative organism Microsphaeropsis coelomycetous anamorph
Foodplant / spot causer UK and/or Eire
/Plantae/Tracheophyta/Magnoliopsida/Ranunculales/Ranunculaceae/Helleborus niger/ Helleborus niger Christmas rose live stem Major
(late winter to summer) Microsphaeropsis coelomycetous anamorph causes spots on live stem
NBN (data.nbn.org.uk)