. Plants; a text-book of botany. Botany. Fig. 166. Cross-section of anther of thorn apple (Datura), showing the four imbedded sporangia (a, p) containing microj^pores; the pair on each side will merge and dehisce along the depression between them for the discharge of pollen.—After Frank. The filament may be long or short, slender or broad, or variously modified, or even wanting. The anther is simply the region of the sporophyll which bears sporangia, and is. Fig. 167. Diagrammatic cross-sections of anthers: A, younger stage, showing the four imbedded sporangia, the contents of two removed, but
. Plants; a text-book of botany. Botany. Fig. 166. Cross-section of anther of thorn apple (Datura), showing the four imbedded sporangia (a, p) containing microj^pores; the pair on each side will merge and dehisce along the depression between them for the discharge of pollen.—After Frank. The filament may be long or short, slender or broad, or variously modified, or even wanting. The anther is simply the region of the sporophyll which bears sporangia, and is. Fig. 167. Diagrammatic cross-sections of anthers: A, younger stage, showing the four imbedded sporangia, the contents of two removed, but the other two con- taining pollen mother cells ipm) surrounded by the tapetum {t)\ B, an older stage, in which the microspores (pollen grains) are mature, and the pair of sporangia on e;ich side are merging together to form a single pollen-sac with longitudinal dehiscence.—After Baillon and Luerssen'. therefore a composite of sporophyll and sporangia and is often of uncertain limitation. Such a term is convenient, but is not exact or scientific. 31. 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
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