34 FISSIDENTACEAE 



3 — Leaves (at least the vaginant lamina) bordered by a narrow band of 



elongated cells 4 



Leaves bordered by several rows of paler, often incrassate cells of 



about the same size and shape as the others 5 



Leaves not bordered (occasionally the outermost row of cells is a 



little paler) 6 



4 — Border usually confluent at apex with the percurrent costa; anther- 



idial buds axillary bryoides 



Border at apex narrow or wanting; antheridial buds at base of stem. 



- incurvus 



5 — Leaf-cells obscure, 6 to 9 x 6 to 12/x; dioiccus cristatns 



Leaf-cells distinct, 12 to 15 x 18 to 24^; monoiccus adiantoides 



6 — Costa excurrent taxifolius 



Ccsta ending in the apex or below 7 



7 — Leaves entire, plants minute, scarcely 2 mm. high in fruit closteri 



Leaves entire, plants in fruit averaging about 1 cm. high. . . .obtasifolius 



Leaves serrulate 8 



8 — Costa nearly percurrent; leaf-cells 9 to 18 x 12 to 24^ osmtmdioides 



Costa ending some distance below apex; leaf-cells roundish, 8 to ii/x. 



subbasilaris 



F. adiantoides (L.) Hedw. Bronx Park, E. G. B., Bx!; East- 

 chester, S. H. Burnham; Yonkers, E. C. Howe; Closter, Austin, 

 Bx! "On wet rocks and' banks, very common," Muse. App. 

 106. Winter. 



F. bryoides (L.) Hedw. Banks of the Hackensack R., Pali- 

 sades of N. J. and Haverstraw, N. Y., Austin, Bx! Autumn. 



Var. inconstans (Schimp.) Ruthe. Palisades, Austin, Bx! 

 (Fide E. G. B.) 



F. closteri Aust. "On rocks along rivulets, Palisades near 

 Closter, N. J.," Muse. App. Suppl. 479. 



F. cristatus Wils. Dolomite boulder near river, Bronx Park, 

 E. G. B., Bx!; Plainfield, N. J. Weigmann. 



F. Hallianus (Sull. & Lesq.) Mitt. " On shaded rocks moist- 

 ened by spray." Rau, Geol. Sur. of N. J., "Rocky rivulet, 

 Sparta, N. J.," 108b., Muse. App. 



F. incurvus Schwaegr. Closter, Austin, Bx!; Brooks, Pali- 

 sades, Gilman, Bx! Late autumn. 



Var. minutulus Aust. "On stones in damp shady or 

 springy places, very common," Muse. App. 102; Annadale, 



