Ramularia jubatskana

(Sacc.) U. Braun

LEAF SPOTS amphigenous, subcircular to angular-irregular, sometimes diffuse, 1-10(-15) mm diam, at first pale greenish, later yellowish-ochraceous, brown, finally greyish white, with an indefinite margin or a narrow to moderately wide darker border, occasionally with a diffuse yellowish halo.

CAESPITULI amphigenous, usually hypophyllous, punctiform, greyish white, sometimes dense.

CONIDIOPHORES (cp) in small to moderately large fascicles, divergent to dense, arising from stromata, emerging through stomata, erect, flexuous, geniculate-sinuous, simple, rarely branched, aseptate or sparsely septate, hyaline, smooth, 20-80(-120) x (1.5-)2.0-6 µm.

CONIDIA (c) solitary, obovoid, ellipsoid(-subglobose), hyaline, smooth to faintly rough, aseptate, (8-)10-22 x (3-)4-10 µm; ends rounded; hila small, slightly thickened and darkened.

PLANT HOST AND DISTRIBUTION. Ramularia jubatskana affects different plant species of the genus Cardus and Cirsium eriophorum (L.) Scop. (Asteraceae) growing in Asia and Europe (Braun 1998).

REFERENCES

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