. Our native ferns and their allies [microform] : with synoptical descriptions of the American Pteridophyta north of Mexico . Ferns; Ferns; Pteridophyta; Fougères; ; . 14.—Antheridium of Adianium Fig. 15.—Youngr archegonium of Pteris capillus-veneris L., showing- the es- serrulata Linn, f., showing oosphere, raping antherozoids. (After Sachs.) neck, and canal-cell. (After Sachs.) and retaining the antherozoids at the neck of the archegonium. The oosphere is thus left exposed (Fig. 15). 65. Fertilization.—The antherozoids, analogous to the pollen of flowers, when discharged from the anthe
. Our native ferns and their allies [microform] : with synoptical descriptions of the American Pteridophyta north of Mexico . Ferns; Ferns; Pteridophyta; Fougères; ; . 14.—Antheridium of Adianium Fig. 15.—Youngr archegonium of Pteris capillus-veneris L., showing- the es- serrulata Linn, f., showing oosphere, raping antherozoids. (After Sachs.) neck, and canal-cell. (After Sachs.) and retaining the antherozoids at the neck of the archegonium. The oosphere is thus left exposed (Fig. 15). 65. Fertilization.—The antherozoids, analogous to the pollen of flowers, when discharged from the antheridium swim in the moisture always present on the under surface of the prothallium, swarm in large numbers around the neck of the archegonium, and are retained by the mucilage. Some finally force their way into the canal of the neck, a few reaching the oosphere and disappearing within its substance. There is thus a true sexual generation among ferns, and the formerly appro- priate term Cryptogaviia (hidden marriage) loses its application under the untiring scrutiny of the microscopist. After fertili- zation the neck of the archegonium closes, and the fertilized 'ill 1!. 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 Underwood, Lucien Marcus, 1853-1907. New York : H. Holt
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Keywords: ., bookcentury1800, bookdecade1880, bookpu, booksubject, bookyear1888
