SPECIES OF MOSSES OP THE GENUS FIS81DENS. 553 



that so few have been discovered with departures from the 

 common types : only one or two are known with slightly 

 rough setse, none with the peristome absent ; the calyptra differs 

 but very little except in F. osmundoides ; it is in the leaves with 

 the states of their margins that distinctions are found which, with 

 the form and origin of the fruit, afford characters by which they 

 may be arranged in an approach to systematic order in the 

 following manner : — 



A. PLANTS TERRESTRIAL. 



* Fkuit apical. 



Leaves with a nerve. 



Leaves with hyaline limb on both laminae. 



Capsule symmetric, erect. 



Fertile flowers synoicous. 



1. F. synanthus. 



Inflorescence monoicous. 

 Male flower bud-like in leaf-axils. 



2. F. bryoides. 4. F. impar. 



3. F. rivularis. 



Male flower basal or terminal. 



5. F. exilis. 7- F. minutulus. 



6. F. viridulus. 8. F. introlimbatus. 



Capsule inclined, unequal-sided. 

 9. F. Curnovii. 14. F. limbatus. 



10. F.fontanus. I 5 - F. Orrii. 



11. F. rufulus. 16- F. incurvus. 



12. F. ventricosus. 17- F. tamarindifohus. 



13. F. texanus. 



Leaves with limb on horizontal lamina only. 



18. F. exiguus. 20. * Donnellii. 



19. F. Ravenelii. 21. F. Garberi. 



Leaves with no limb. 



22. F. Bloxami. 25. F Hallii. 



23. F. Closteri. 26. F. obtusifohus. 



24. F. Amoldi. 27. F. osmundoides. 



