Ramularia cynarae Sacc.

LEAF SPOTS amphigenous, mainly epiphyllous, subcircular to angular-irregular, sometimes almost diffuse, 1-20 mm diam, at first pale greenish, yellowish-ochraceous, later brown, greyish brown, finally greyish white, with an indefinite margin or a dark brown border, occasionally with a diffuse darker halo; spots sometimes confluent, rarely zonate.


CAESPITULI amphigenous, punctiform to subeffuse, greyish white.

CONIDIOPHORES (cp) in small to moderately rich fascicles, arising from stromata, emerging through stomata, rarely erumpent through the cuticule, loose to dense, simple, rarely branched, straight, subcylindric to flexuous, geniculate-sinuous, sometimes filiform, aseptate or septate, hyaline, smooth, 5-60 x 2-6(-7) µm, occasionally longer, up to 140 µm.


CONIDIA (c) catenate, occasionally in branched chains, ellipsoid-ovoid, subcylindrical to fusiform, hyaline, smooth to faintly rough, 0-3-septate, (5-)10-35(-55) x (1.5-)2-5(-7) µm; ends rounded or attenuated; hila slightly thickened and darkened.


PLANT HOST AND DISTRIBUTION. Ramularia cynarae affects different plant species of the genera Carduus, Carthamus, Cirsium, Cousinia, Cynara, Echinops, Jurinea, Onopordum, Saussurea, and Silybum (Asteraceae, Cynareae) growing in Asia, North Africa, Europe, as well as in North and South America (Braun 1998).


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