48 HOEMEISTER, ON THE HIGHER CRYPTOGAMIA. 



of cellular tissue is raised round the antheridium by the 

 multiplication of one of its adjoining epidermal cells. 

 Aneura multifield produces buds, often in very large num- 

 bers, near the ends of its shoots. Some of the cells of the 

 upper surface, not unfrequently whole groups of twenty or 

 more, protrude outwards in the form of an arch, become 

 quite filled with chlorophyll-granules, and divide by a sep- 

 tum passing transversely through the cell perpendicular to 

 the surface of the shoot ; the same thing occurs, but less 

 frequently, in the cells at the edge (PL VI, fig. 9). The 

 bicellular bud becomes free by the swelling up of the middle 

 layers of the wall of its mother-cell into a gelatinous sub- 

 stance which expands largely in water, in consequence of 

 which the outer lamella of the wall bursts, and the buds 

 escape. Their form is that of a somewhat elongated ellip- 

 soid, strongly constricted at its equator; its outline brings 

 to mind that of many of the Desmidiese (PI. VI, fig. 10). 

 The development of the buds into a new plant begins with 

 the repeated division of one of their cells by alternately in- 

 clined septa. . 



