MOSSES, LIVERWORTS, AND FERNS 265 
egg, where one of them unites with the egg, thus producing 
an odspore, or sex spore. 
The odspore does not have a resting period, as in | wucheria, 
but begins its growth almost immediately when formed. It 
enlarges, divides into many cells (that is, it grows), and soon 
elongates into a stalk one end of which is attached to the old 
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a 
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a 
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Fic. 204. Reproductive organs of moss 
A, an antheridium containing the mother cells (7m) of the sperms; the eap (c¢) Jater 
opens to allow exit of sperm mother cells; B, one sperm; (’, a diagram showing 
the relations of antheridia (an) and archegonia (ar), and the leaves (J) on the tip of 
the shoot; D, an archegonium with the egg (e), the neck (m), and the mucilagin- 
ous mass (m) through which the sperms pass to reach the egg. All are the moss 
Atrichum undulatum. From Bonnier and Sablon 
leafy stalk, and the other extends up above the leaves. The 
stalk which grows from the odspore bears chlorophyll. A cap- 
sule is produced at the tip of this new stalk, and spores are 
formed by the division of part of the inner tissues of the cap- 
sule. Since these spores are formed by division of tissues and 
not by union of cells, it is obvious that they are asexual spores. 
When they fall to the ground, they produce protonema again, 
and thus begin another life round of the moss plant. The 
