1	"Costa with stereid bands on both abaxial and adaxial sides, mostly with well-differentiated epidermises on both surfaces but without abaxial ridges"	2
1	"Costa without a well defined adaxial stereid band; epidermises and abaxial ridges various"	4
2	"Leaf base with marginal cells more narrow than those interior to the margin and therefore with little differentiation of the alar region"	"Campylopodiella stenocarpa"
2	"Leaf with most of the basal marginal cells quadrate and inflated strongly defining an alar region"	3
3	"Median cells of leaf linear and porose; subula occupying more than 1/2 of leaf; older leaves on stem readily caducous"	"Dicranodontium denudatum"
3	"Median cells of leaf rectangular but not porose; subula shorter; leaves not caducous"	"Atractylocarpus flagellaceus"
4	"Costa filling nearly all of leaf with cross-section 3-cells thick and with thin-walled cells on both surfaces with the interior layer of cells smaller and deeply chlorophyllose"	"Paraleucobryum enerve"
4	"Costa somewhat more narrow, without a median layer of chlorophyllose cells"	5
5	"Plants with fragile shoots so that the surface of the plant is often covered with fragments of small leafy shoots; costa without stereids or with a weak and interrupted layer of abaxial stereids; leaves typically without hyaline awns"	6
5	"Plants without such fragile shoots; costa with a strong and continuous layer of abaxial stereids; leaves typically with hyaline awns"	7
6	"Leaves evenly contracted from base to apex; costa without stereids with the abaxial cross-section showing substereids"	"Campylopus subulatus"
6	"Leaves with a broadened base that abruptly contracts into a subulate apex mostly filled with the costa; costa mostly with a band of abaxial stereids"	"Campylopus pyriformis"
7	"Basal juxtacostal cells thick-walled and porose with a strong red-brown pigmentation; cells of distal portion of leaf linear and vermiculose"	"Campylopus atrovirens"
7	"Basal juxtacostal cells not so differentiated; cells of distal portion of leaf mostly shorter, not vermiculose"	8
8	"Costa smooth abaxially"	"Campylopus schmidii"
8	"Costa ribbed on abaxial surface"	9
9	"Awns on dry plants reflexed away from plant axis about 90 degrees"	"Campylopus introflexus"
9	"Awns erect even on dry plants"	"Campylopus pilifer"