File:The structure and development of mosses and ferns (Archegoniatae) (1918) (14784974225).jpg

Identifier: structuredevelop00camp3 (find matches)
Title: The structure and development of mosses and ferns (Archegoniatae)
Year: 1918 (1910s)
Authors: Campbell, Douglas Houghton, 1859-1953
Subjects:
Publisher: New York, Macmillan
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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n MUSCINE^—HEPATIC JE—MARCH ANTI ALES 6i (i, 2) and others in Marchantia, Grwialdia, and Prcissia, andprobably occurs normally in all Marchantiaceae. After the tirst anticlinal walls are formed in the octants, no
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Fig. 23.—Targionia hypophylla. A, Longitudinal section of the venter of a ripearchegonium, Xsoo; B-E, development of the embryo, seen in longitudinalmedian section—B, two-celled, D, four-celled stages, X500 except E, which ismagnified 150 times; F, median section of the upper part of an older embryo,X250. definite order could be observed in the succeeding cell divisions,especially in the lower half of the embryo. In the upper part 62 MOSSES AND FERNS :hap. periclinal walls appear, but not at any stated time, so far ascould be made out, and the first ones do not, as Leitgeb asserts,necessarily determine the separation of the archesporium, as inthe Corsiniese. The growth now becomes unequal, the cells inthe central zone not dividing so actively, a marked constrictionis formed, and the young sporogonium becomes dumb-bellshaped. By this time a pretty definite layer of cells (Fig.27,, F) is evident upon the outside of the capsule, but the cellsof the globular lower part, or foot, are n

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