FILICINEM. 
443 
mother-cell (Fig. 309, Z>). In Marsilia and Pilularia the antherozoids are pro- 
duced in much the same manner ; the protoplasmic contents of the microspore 
divide into three cells: when the exospore bursts, the endospore protrudes containing 
these three cells, of which one is sterile (rudimentary prothallium) and the other 
two produce antherozoids : within each of these two cells divisions take place so 
that a number of tetrahedrally-arranged primordial cells are formed which become 
surrounded with thin cell-walls, and are the mother-cells of the antherozoids. As 
in Ferns, we find also in Rhizocarps only a portion of the contents of the 
mother-cell applied to the formation of the antherozoid. According to Millardet, 
Fig. ^jo.— Marsilia Salvatrix ; A macrospore sp with its epispore st and the apical papilla projecting into its funnel: in 
the papilla is a broad yellowish drop, sg the ruptured wall of the niacrosporangiuni (X about 30). B a microspore burst after 
the escape of the antherozoids; ex the exospore, dl the protruding endospore containing granules, z, z the spiral anthero- 
zoids, jp'ji' their vesicles containing starch-grains. The epispore of the microspore is no longer in existence (XSSo). (The 
exospore does not show the regular arrangement of the protuberances, which is indicated erroneously in the figure.) 
this portion assumes the form of a roundish turbid mass consisting of protoplasm 
and starch-granules, which, during the formation of the antherozoids, becomes 
gradually clearer, and, when the latter escape from the mother-cell, forms a 
vesicle consisting of the unused protoplasm and the starch-granules lying in it. In 
Pilularia^ where the antherozoid is a thread coiled four or five times, this vesicle 
remains attached to the mother-cell. In Marsilia, on the contrary, it adheres to 
the posterior coils of the corkscrew-like antherozoid, which is coiled 12 or 13 times; 
and is often carried about with it for a considerable time by its swarming motion. 
