Dichotomous table for gallers on Scirpus
(incl. Blysmus, Bolboschoenus, Eleogiton, Isolepis, Schoenoplectus, Trichophorum. ‒ Comp. Eleocharis)
by Hans Roskam
1a Galls on above-ground parts => 3
1b Galls on roots => 2
2a Swellings on all sides, slender, elongate spindle-shaped, many on markedly shortened lateral roots. S. sylvaticus: Meloidogyne hapla
2b wellings on root tips almost club-shaped. Many oblong-oval to lemon-shaped, yellowish spores inside. Isolepis fluitans: Entorrhiza raunkiaeriana
3a Swelling in stem, about 15 mm long, at junction of leaf blade and sheath, probably on stunted shoots; containing a white larva or pupa. Bolboschoenus maritimus: Eurina lurida
3b Uredinia on underside leaf, cinnamon brown, pulverulent. Telia on both sides, long covered by the epidermis, brownish black; teliospores one-celled on a persistent pedicel. Blysmus compressus; Bolboschoenus maritimus; Schoenoplectus lacustris: Uromyces lineolatus
3b Ovaries at first ± swollen, egg-shaped then destroyed and transformed into a smut grain up to 2 mm long, almost globular, compact, black inside. Trichophorum cespitosum incl. subsp. germanicum, pumilum: Anthracoidea scirpi