16 The Botanical Gazette. | January, 
(1). Inthe twenty genera of gymnosperms which have bee ¥ 
studied the uniform presence of a single apical cell at the 
cell, as in the lower vascular Archegoniata, is sometimes 
pyramidal, sometimes prismatic, but always solitary. Heret 
They are, by it alone, sharply discriminated from the rest 
the seed-plant phylum. 
(2). Inthe monocotyledons there are two categories to be 
distinguished; first where there are three initial cells at the 
apex of the stem from which all the others are derived, as if 
Phragmites, Tradescantia, Zea, Asparagus, Polygonatum, 
Canna and others; and second, where there are but two, as im 
the Naiadacee, Potamogetonacex, Juncacea, Alismacea am 
lydrocharidacew. The latter case is the more frequent. 
(3). In the great majority of the dicotyledons the stem is 
terminated by three apical or initial cells. In a small numbef, 
_ plan which proposes to recognise - 
tween the heterosporous Filjcne 
. 
