The Structure & Development of the Mosses & Ferns (Archegoniatae).
The Structure & Development of the Mosses & Ferns (Archegoniatae).
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223, A) shows an evident apical cell (probably one of several), not unlike that of the Ferns ; but the great difficulty of obtaining accurate sections through it made it impossible to follow exactly its further development. This much can be stated confidently, however, that at the time when the first archegonia are produced, the structure of the prothallium is essentially that of Osmunda or MarattiUy and consists of a central massive midrib and a one- celled lamina, which is not continuous, but... composed of separate lobes. A similar condition exists in Osmunda, where * Buchtien (i).
430 MOSSES AND FERNS in the older prothallia similar but much shorter and broader lobes arise alternately from either side of the growing apex.
The development of the archegonium is intimately asso- ciated with the formation of the lobes. The archegonium mother cell is formed close to the base of the young lobe upon the ventral side. By subsequent growth of the tissue between it and the apical meristem, it is subsequently forced to the upper side, but its origin is ventral, as in the Ferns.
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To quickly assess the difficulty of the text, read a short excerpt:
223, A) shows an evident apical cell (probably one of several), not unlike that of the Ferns ; but the great difficulty of obtaining accurate sections through it made it impossible to follow exactly its further development. This much can be stated confidently, however, that at the time when the first archegonia are produced, the structure of the prothallium is essentially that of Osmunda or MarattiUy and consists of a central massive midrib and a one- celled lamina, which is not continuous, but... composed of separate lobes. A similar condition exists in Osmunda, where * Buchtien (i).
430 MOSSES AND FERNS in the older prothallia similar but much shorter and broader lobes arise alternately from either side of the growing apex.
The development of the archegonium is intimately asso- ciated with the formation of the lobes. The archegonium mother cell is formed close to the base of the young lobe upon the ventral side. By subsequent growth of the tissue between it and the apical meristem, it is subsequently forced to the upper side, but its origin is ventral, as in the Ferns.
What to read after The Structure & Development of the Mosses & Ferns (Archegoniatae).?
You can find similar books in the "Read Also" column, or choose other free books by Campbell Douglas Houghton to read onlineMoreLess
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