Entyloma microsporum (Unger) Schröter, 1874
on Ranunculus
Ranunculus repens, Belgium, prov. Flemish Brabant, Zichem © Carina Van Steenwinkel: the leaf spots are large and swollen gall-like
spores numerous, thick-walled, irregular in shape
Ranunculus repens, Dronten © Arnold Grosscurt
another leaf
Ranunculus repens, Nieuwendam
the spores are irregular in shape, generally somewhat angular, often very thick-walled; ø 11-13 µm.
Ranunculus repens, Leiden; leg Karel Brussee
parasite
Sori as yellowish, hard, swollen, up to 6 mm large pustules. Embedded in the host tissue are dense groups of hyaline spores. Spores irregular, angular in shape; they measure ± 10-19 µm, the wall is thick, 2-5 µm, and consists of two layers
host plants
Ranunculaceae, narrowly monophagous
Ranunculus acris, repens.
In the literature prior to the revision by Kruse ao (2018a) the following species are mentioned as host plants; these associations now need further confirmation: R. alpestris, breyninus, bulbosus, carpaticus, chaerophyllos, flammula, lanuginosus, montanus, muricatus, oxyspermus, polyanthemos & subsp. nemorosus, sardous, sceleratus apply to different species.
synonyms
Protomyces microsporus (Unger) Cooke, 1875.
references
Ainsworth & Sampson (1950a), Almaraz (1998a)m Beltran Tejera (1976a), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Ellis & Ellis (1997a), Klenke (2002a), Klenke & Scholler (2015a), Kozłowska, Mułenko & Heluta (2015a), Kruse (2019a), Kruse, Piątek, Lutz & Thines (2018a), Lutz & Vánky (2009a), Redfern & Shirley (2011a), Savchenko & Heluta (2012a), Scholz & Scholz (2013a), Tóth (1994a), Vanderweyen & Fraiture (2014)a), Vánky (1994a), Vánky & Abbasi (2013a), Vánky, Lutz & Bauer (2008b), Woods, Chater, Smith ao (2018a).