Ramularia lampsanae

(Desm.) Sacc.

LEAF SPOTS amphigenous, variable, at first obscure, diffuse, pale greenish, later subcircular to angular-irregular, sometimes vein-limited, 1-20 mm diam, frequently confluent, expanded, larger dry, necrotic, yellowish-ochraceous, finally brown to greyish brown, with an indefinite margin.

CAESPITULI amphigenous, usually hypophyllous, punctiform, greyish white.

CONIDIOPHORES (cp) usually in moderately large fascicles, arising from stromata, emerging through stomata, occasionally erumpent, straight, subcylindric or mostly geniculate-sinuous, simple, hyaline, smooth, 0-2-septate, (6-)10-50 x (1.5-)2.0-5(-6) µm.

CONIDIA (c) catenate, sometimes in branched chains, ellipsoid-ovoid, fusiform(-subcylindric), hyaline, almost smooth to verruculose, 0-1-septate, (4-)6-18(-25) x (1.5-)2-5(-6) µm; ends rounded to attenuated; hila slightly thickened and darkened.

PLANT HOST AND DISTRIBUTION. The plant host of R. lampsanae are Lampsana communis L., L. grandiflora Bieb., and L. intermedia (Asteraceae; Braun 1998).

Ramularia lampsanae has been found in different regions of New Zealand, Europe, North America, and Canada (Braun 1998).

REFERENCES

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