. Elements of plant anatomy;. Botany -- Anatomy. A piece of rhizoid of Marchantia poly- morpha. B epithel cells of petal of Pelargonium zonale. r projections into cell lumen, x 300. — (Wiesner.) Examples : Rhizoids of Marchantia and certain ducts whose walls are strengthened by conical inward projections. (See Fig. 9.) II. The thickening is not limited to spots but runs in continuous spirals with varying closeness of coil. Examples : Spiral ducts. III. Wall thickened in separate rings. Examples : Ring ducts. (Fig. 10.) IV. The thickened ridges run parallel to the long axis of growth and are co
. Elements of plant anatomy;. Botany -- Anatomy. A piece of rhizoid of Marchantia poly- morpha. B epithel cells of petal of Pelargonium zonale. r projections into cell lumen, x 300. — (Wiesner.) Examples : Rhizoids of Marchantia and certain ducts whose walls are strengthened by conical inward projections. (See Fig. 9.) II. The thickening is not limited to spots but runs in continuous spirals with varying closeness of coil. Examples : Spiral ducts. III. Wall thickened in separate rings. Examples : Ring ducts. (Fig. 10.) IV. The thickened ridges run parallel to the long axis of growth and are con- nected by short cross-bars. Examples : Ladder, or scalariform FlO. 10. Fragments of ducts from stem of Rye in long sec- tion. A spiral. B ring duct, r ring loosened and separated from duct. X 250. —{Wiesner.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gregory, Emily L. Boston, London, Ginn & Co.
Size: 1151px × 2170px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotanya, bookyear1895
