LEAF SPOTS amphigenous, almost inconspicuous, diffuse or subcircular to mostly angular-irregular, frequently vein-limited, sometimes oblong, (0.5-)1-10(-15) mm diam, at first pale greenish, yellowish-ochraceous, pale brownish or reddish, later pale to dark brown, greyish brown, sometimes dull greyish or greyish white, frequently confluent, sometimes large leaf areas or almost entire leaves discoloured, with an indefinite margin or rarely with a wide, dull brown, dark brown to purplish violet or reddish border, sometimes with a diffuse halo.

CAESPITULI amphigenous, punctiform to subeffuse, greyish white, loose to dense.

CONIDIOPHORES (cp) in small to moderately large fascicles, loose to dense, arising from stromata, emerging through stomata, rarely erumpent, erect, subcylindric to geniculate-sinuous, straight, simple, rarely branched, 0-3-septate, hyaline, smooth, (5-)10-60(-105) x (1.5-)2-5(-6) µm.

CONIDIA (c) catenate, frequently in branched chains, ellipsoid-ovoid, subcylindric-fusiform, hyaline, almost smooth to verruculose, 0-1(-3)-septate, (5-)10-35(-55) x (1.5-)2-6(-7) µm; ends obtuse, rounded to slightly attenuated, obconically truncate; hila slightly thickened and darkened.

PLANT HOST AND DISTRIBUTION. Ramularia lamii affects different plant species of various genera of the families Lamiaceae and Lamioideae growing in Asia, Europe, and North America (Braun 1998).

REFERENCE

Braun U. 1998. A monograph of Cercosporella, Ramularia and allied genera. Vol. 2. IHW-Verlag.