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2 
1889. 
EXPLANATION OF PLATES V-IX. 
All figures were drawn with the aid of a camera lucidaand a Bausch and 
Lomb microscope, and were reduced to one fourth their original size in 
reproduction. 
PLATE V, Selaginella apus. Oc. ¥%, otl immersion +3. 
Fig. 1. Vertical median section of tip of strobilus showing the apical cell, 
a young sporophyll whose apical cell is just established, an archesporial cell 
(shaded), and a two-celled sporophyll (istingsed by black nucleoli). 
FIG. 2. Radial section of portion of strobilus showing sporophyll and 
two superposed cells (shaded), resulting from a transverse division of the 
archesporial cell. The superficial cell by repeated division in one plane 
Sa a a Tak 
