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''Phragmidium '' is a genus of rust fungus that typically infects plant species in the Rosaceae. It is characterised by having stalked teliospores borne on telia each having a row of four or more cells. All species have a caeoma which is a diffuse aecidium lacking a peridium.〔''Fungi''. Lilian E Hawker, 1966, Hutchinson University Library〕 There are a number of species of Phragmidium'' most of which are restricted to one or a few host species. Examples include: * ''P. acuminatum'' on ''Rubus saxatile'' * ''P. bulbosum'' on ''Rubus fruticosus'' and ''Rubeus caesius'' *''P. sterilis'' on ''Potentilla sterilis'' *''P. potentillae'' on ''Potentilla anglica'' *''P. rubi-idea'' on Raspberry *''P. tuberculatum'' on some Rose cultivars *''P. violaceum'' on cultivated Blackberry and Loganberry Possible the most commonly encountered is ''P. mucronatum'' found on most species of wild roses including ''Rosa canina'' and ''Rosa arvensis ==Pathology== Roses infected with species of ''Phragmidium'' will show a characteristic orange mass of spores and distorted growth at specific locations on the bush. The rose may be substantially weakened and lack vigour and may die. Later in the year, small black spots or raised areas will be visible. These are telia containing overwintering teliospores. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phragmidium」の詳細全文を読む スポンサード リンク
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