17 



Fam. 7. Meteoriacese. 



18. PapiLlaria. Alar leaf-cells numerous; inner 

 cells dilated ; costa short and double. 



19. Meteorium. Alar leaf-cells few; inner cells 

 sublinear; costa simple. 



Fam. 8. Hookeriacese. 



I. Hookerieoe. Capsule and pedicel smooth. Upper 

 leaf-cells very dilated. 



A. Leaves with 2 long nerves, generally narrowly 

 limbate; upper cells round-hexagonal. 



20. Hookeria. Leaves smooth; cells large; nerves 

 not spiniform. Calyptra lobulate at base. Monoecious 

 or polygamous. 



21. Callicostella. Leaves papillose; cells not large; 

 nerves spiniform. Calyptra fringed. Monoecious. 



B. Leaves not or obsoletely costate, not distinctly 

 limbate; upper cells oval-hexagonal. 



22. Pterygophyllum. Leaves smooth; cells large. 

 Calyptra lobulate at base. Monoecious. 



II. DaltoniecB. Capsule and pedicel rough. Upper 

 leaf-cells suboblong. 



23. Daltonia. Leaves smooth, broadly limbate; costa 

 long and simple. Calyptra fringed below the narrow point. 

 Monoecious or synoecious. 



Fam. 9. Leskeacese. 



A. Leaves with papuliferous cilia. 



24. Thelia. Leaves strongly papillose, from the 

 broadly round-ovate base abruptly tapering to the long 

 acumen, not recurved; upper and middle cells rotundate; 

 costa short. Stem often with numerous paraphyllia; bran- 

 ches erect and julaceous. 



B. Leaves not ciliate. 



a. Stem with paraphyllia. Leaves often papillose. 



25. Pterygynandrum. Leaves papillose ; upper cells 

 suboblong, the inner ones- narrower; costa short, simple 



2 



