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Explanation of Plate IX. 
Fissidens synoicus Sulliv. Figures i to 7 and 
Fig. 11. 
Plant natural size. 
Plant X 5 diameters. 
Leaf X 25 diameters. 
Portion of leaf, showing arrangement of 
cells, X 75 diameters. 
Capsule X 75 diameters. 
6. Portion of peristome X 1 50 diameters, 
7. Synoicous flower X 150 diameters. 
11. Flower of Fissidens synoicus X 150 diameters. 
Fissidens inconst ans Schimp Figures 8 to 10. 
8. Plant X 5 diameters. 
9. Leaf X 25 diameters. 
10. Portion of leaf X 75 diameters. 
All reduced one-half. 
THE VALIDITY OF SOME SPECIES OF FISSIDENS. 
E. J. Hill. 
Among the species of Fissidens which I have observed in the prosecu- 
tion of field work none have had so varied a treatment as the following: F 
inconst ans Schimp., F. synoicus Sulliv., F. minutulus Sulliv. and F 
