. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. THE MBQASPOEANGIUM 59 bus, and Cydonia, indicating that this is the prevailing tend- ency among the Rosaceae. In 1882 Guignard17 added Erio- botrya to the list, and in 1901 Murbeck 57 found an archesporial group in Alchemilla alpina. Recently, however, Pechoutre 63 has made a general survey of the Rosaceae, and in all of the fourteen genera studied, veil distributed among the tribes, there was found a many-celled archesporium, showing a remarkable persistence of this character throughout a large
. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. THE MBQASPOEANGIUM 59 bus, and Cydonia, indicating that this is the prevailing tend- ency among the Rosaceae. In 1882 Guignard17 added Erio- botrya to the list, and in 1901 Murbeck 57 found an archesporial group in Alchemilla alpina. Recently, however, Pechoutre 63 has made a general survey of the Rosaceae, and in all of the fourteen genera studied, veil distributed among the tribes, there was found a many-celled archesporium, showing a remarkable persistence of this character throughout a large family. Among the closely allied Saxifragaceae also, Webb60 has found in Astilbe this same type of archesporium. In 1891 Treub 23 published his account of Casuarina, re- porting that the archesporium is a group of hypodermal cells, and that the derived sporogenous tissue forms a large central mass within the nucellus (Fig. 24). The account and the fig-. Fm. 24.—Casuarina. Longitudinal sections of nucellus. A, section showing two pri- mary sporogenous cells (shaded); x 190. S, later stage showing extensive sporog- enous tissue; x 190. C, pollen-tube (with heavier walls) among the elongated sterile megaspores ; x 67. D, portion of nucellus at a much earlier stage than C, showing numerous megaspore mother-cells; 157.—After ; ures suggest that all of the sporogenous tissue may not be derived from the hypodermal layer. In 1894 Miss Benson28 discovered that a several-celled archesporium is present in Fa-. 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; Chamberlain, Charles Joseph, b. 1863. New York, D. Appleton
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