LEAF SPOTS amphigenous, subcircular to angular-irregular, 1-6 mm diam, at first pale greenish, later yellowish-ochraceous, pale brown, finally greyish white, with an indefinite margin or a narrow dark border.
CAESPITULI amphigenous, gregarious, punctiform, greyish white, often dense, present on a large leaf area or almost on the entire leaf.
CONIDIOPHORES (cp) in small to moderately large fascicles, loose to dense, developing from stromata, emerging through stomata or erumpent through the cuticule, erect, straight, subcylindric to slightly geniculate-sinuous, aseptate or sparsely septate, hyaline, smooth, 10-80 x (2-)3.0-6.o(-7.0) µm.
CONIDIA (c) catenate, sometimes in branched chains, ellipsoid-ovoid, subcylindric, fusiform, hyaline, almost smooth to verruculose, aseptate or 1-2-septate, 10-35 x (3-)4-8(-9) µm; ends rounded to attenuated; hila small, slightly thickened and darkened.
PLANT HOST AND DISTRIBUTION. Ramularia agrestis occurs on different plant species of the genus Viola growing in Europe and North America (Braun 1998).
Braun U. 1998. A monograph of Cercosporella, Ramularia and allied genera. Vol. 2. IHW-Verlag.