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White Moulds, Ramularia and Phacellium Anamorphs, in Wales and Britain: a Guide and Welsh Census Catalogue

Arthur O. Chater, Ray G. Woods, R. Nigel Stringer, Debbie A. Evans & Paul A. Smith (2021)

Ramularia species, often referred to as White Moulds, are a large and interesting but little studied group of parasitic Hyphomycete fungi. Eighty-one species are reported here from
Wales in 180 unique combinations with their host organisms. This compares with a total for Britain and Ireland of 108 species reported in 307 combinations with host species. Most are
parasitic on vascular plants causing, in a few cases, economically significant damage to crops. Many, however, appear to co-habit successfully with their host plants. Indeed, despite
almost half of the Welsh species being reported from gardens, few gardeners will be aware of their existence.

This guide has been created to assist in White Mould identification and to stimulate further recording to better understand their ecology and distribution.