Xylem cells are elongated cells with lignified secondary thickening of the cell walls. Xylem cells are specialised for conduction of water, and first appeared in plants during their transition to land in the Silurian period more than 425 million years ago (see Cooksonia). The possession of xylem defines the vascular plants or Tracheophytes.
hobo. a hobo is an itinerant worker, a career which sprang up during the depression. A hobo, unlike a bum or a tramp, is more than willing to work, but mostly for a short duration, as their main impetus is travel, the love of the journey above the actual destination.
One is carrying a bindle. A hobo is a migrant worker or homeless vagabond, especially one who is impoverished. The term originated in the Westernâprobably NorthwesternâUnited States around 1890. Unlike a tramp, who works only when forced to, and a bum, who does not work at all, a hobo is a traveling worker.