The fine structure of the haustorium ofUromyces appendiculatus in Phaseolus vulgaris

摘要

Examination of the fine structure of the haustorium ofUromyces appendiculatusinPhaseolus vulgarisrevealed a hitherto undescribed structure, the neckband, a short zone of darkly staining deposit in the stem of the haustorium. This occurs above that part of the wall of the stem which is associated with the sheath around the base of the haustorium and below the wall of two distinct layers belonging to the body of the haustorium.