LEAF SPOTS amphigenous, subcircular to somewhat irregular, 1-12 mm diam, at first brownish, later greyish brown, finally greyish white, with a narrow, dark margin.
CAESPITULI amphigenous, greyish white, punctiform to subeffuse.
CONIDIOPHORES (cp) in small to large fascicles, developing from stromata, through stomata, erect, straight, subcylindric to flexuous, simple, rarely branched, 10-85 x (1.5)2.5-6(-7.0) µm, aseptate or sparsely septate, hyaline, smooth.
CONIDIA (c) catenate, sometimes in branched chains, ellipsoid-ovoid, cylindrical, hyaline, smooth to faintly rough, 0-1(-3)-septate, (6.0-)8.0-35.0(-40.0) x (2.0-)3.0-7(-10.5) µm; ends obtuse to slightly attenuated; hila slightly thickened and darkened.
PLANT HOST AND DISTRIBUTION. In Poland, R. urticae has been found associated only with Urtica dioica L. and U. urens L. (Adamska 2001; Adamska and Blaszkowski 2000; Braun 1998; Madej 1963). In other regions of the world, the fungus has also affected other species of the genus Urtica (Braun 1998). Ramularia urticae has a worldwide distribution (Braun 1998).
NOTES. The teleomorph of R. urticae is Mycosphaerella superflua (Auersw.) Petr. (Braun 1998).
Adamska I. 2001. Microscopic fungus-like organisms and fungi of the Slowinski National Park. Acta Mycol. 36(1), 31-65.
Adamska I., Blaszkowski J. 2000. Microscopic fungus-like organisms and fungi of the Slowinski National Park. I. Acta Mycol. 35, 243-259.
Braun U. 1998. A monograph of Cercosporella, Ramularia and allied genera. Vol. 2. IHW-Verlag.
Madej T. 1963. Przyczynek do znajomosci flory grzybów pasozytniczych wywolujacych choroby roslin. Zesz. Nauk WSR Szczec. 10, 79-88.