Plant Parasites of Europe

leafminers, galls and fungi

gallers on Gagea

Dichotomous table for gallers on Gagea

by Hans Roskam

1a Expanded galls on all green parts, according to the plant part affected => 3

1b Inconspicuous galls, consisting of a single swollen epidermis cell, on all green parts => 2

2a 1-celled warts, very small, punctiform, slightly protruding, yellowish; inside the spindle-shaped, swollen nutritive cell is a single 100 x 150 μm, or several (up to 10), globular or oval to flattened resting sporangia with colourless contents. G. pratensis: Synchytrium punctatum

2b Galls similar. The nutritive cell contains 1–3 resting spores, with red-orange or yellow contents. G. lutea, minima, pratensis: Synchytrium laetum

3a Bulging galls caused by smut fungi => 4

3b Leaves stunted; with irregular, pale, rugose-spongy swellings at base. Leaf blades twisted and curved. G. pratensis: Ditylenchus dipsaci

4a Rotund to oval smut pustules, about 2–10 mm long bulging, bladder-like, sometimes coalescing, which erupt rather late with longitudinal slits and release a blackish-olive-brown spore mass. Spores single. Gagea spp.: Vankya ornithogali

4b Similar but predominantly isolated, often extensive smut bulges on leaves and scapes; spores single or clustered in balls of 2–3 (5), enveloped by sterile auxiliary cells. G. pauciflora: Urocystis ornithogali

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