. Plants; a text-book of botany. Botany. 198 PLANT STEUOTUEES . If a young anther be sectioned transversely four sporan- gia will be found imbedded beneath the epidermis, a pair on each side of the axis (Figs. 166,167). When they reach maturity, the paired sporangia on each side usually merge to- gether, forming two spore-containing cavities (Fig. 167, B). These are generally called " pollen-sacs," and each anther is said to consist of two pollen-sacs, although each sac is made up of two merged sporangia, and is not the equivalent of the pollen-sac in Gymuosperms, which is a single s
. Plants; a text-book of botany. Botany. 198 PLANT STEUOTUEES . If a young anther be sectioned transversely four sporan- gia will be found imbedded beneath the epidermis, a pair on each side of the axis (Figs. 166,167). When they reach maturity, the paired sporangia on each side usually merge to- gether, forming two spore-containing cavities (Fig. 167, B). These are generally called " pollen-sacs," and each anther is said to consist of two pollen-sacs, although each sac is made up of two merged sporangia, and is not the equivalent of the pollen-sac in Gymuosperms, which is a single Fig. 167a. Various forme of stamens; A, from Solannni. showing dehiscence liy terminal pores; B, from A/dutus, showing anthers witli terminal pore^ and "horns"; (7, from Berben'i; D, from Atlnrosperma, showing dehiscence by uplifted valves; _£", from Aqi/U^gia, showing longitudinal dehiscence ; F, from Popowia. showing pollen-sues near the middle of tlie stamen.—After Engler and 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and company
Size: 1440px × 1735px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1900
