An intrusion of one vegetable cell into the cavity of another, sometimes forming there an irregular mass of cells.
Outgrowth of a cell membrane from a ray or axial parenchyma cell through a pit in a xylem vessel wall into the vessel, partially or completely blocking the lumen of the vessel.[1] UREDIAL STAGE (uredium) - A stage of the rust fungi; a fruiting structure usually appearing as a pustule bearing the repeating spore stage that leads to disease increase. Fin. Swe. WATER-SOAKED - A dull green coloration of diseased tissues due to membrane leaking of cellular contents into intercellular spaces.[1] Fin. Swe.
A balloon-like overgrowth of the protoplast of a parenchyma cell into an adjacent xylem vessel.