> 
88 
7 
10. 
Il. 
12. 
13. 
14. 
15. 
16. 
17. 
18. 
19. 
CONNECTICUT GEOL. AND NAT. HIST. sURVEY. [Bull. 
Leaves smooth, eroso-denticulate at the apex........ 
Acaulon, p. 108 
Leaves papillose, entire .............-...-.. Phascum, p. 108 
Peristome, when present, with articulate teeth........... 9 
Peristome teeth not articulate........... 0... ee eee ee eee 53 
Péristome preseiit: < .asiaccasee ocdea veceae cence tsa aaetese 10 
PeristOme: NONE: cen< ices yegeecs hee RMideruawid su vee ane 48 
Leaves in 2 ranks, clasping at the base, and with a promi- 
PEN COPSAl WATE: 5 shai oc. 4ccl sqrt hua incand siavatovas psa suinaaed sn reaped: iaial suse II 
Leaves in 3 or more ranks, not clasping at the base or 
WINE is ss. sve ye winaix vu aus be wm eer Hana cvaheg sees 12 
Plants flaccid, aquatic, floating ........... Octodiceras, p. 105 
Plants not flaccid, sometimes submerged, but not floating 
Fissidens, p. 103 
Leaves with.a single layer of small chlorophyll cells 
enclosed by two or more layers of large hyaline cells 
‘ Leucobryum, p. 102 
Leaves mostly with a single layer of uniform cells........ 3 
Peristome single, consisting of 16 or 32 teeth; teeth 
usually without a median longitudinal line on the outer 
Surface’. cccivisiaw tass0es pee ee 4 bee oe ae eae 14 
Peristome double, the outer more or less thickened and 
consisting of 16 teeth, the inner thin and divided into 
segments or cilia or both; teeth with a distinct median 
longitudinal line on the outer surface.................. 33 
Capsule with 8 longitudinal ridges of differentiated cells 
Rhabdoweisia, p. 99 
Capsule smooth or, when plicate, the epidermis of 
uniform cell structure ........... ccc cece eee eee tee ee eee 15 
Peristome teeth with very minute longitudinal striations 
Oni. the outer surface wees: geskes sew ve uee ev sew Sak eoY PERS 16 
Peristome teeth without longitudinal striations on the 
outer surface, smooth or papillose...............0..005: 19 
Alar cells large, hyaline or brown.......... NTE Ts et v7 
Alar cells not differentiated........... 0... ccc cece eee eee 18 
Leaves tufted; capsule distinctly strumose; monoicous.. 
Oncophorus, p. 99 
Leaves regularly secund; capsule not strumose or ob- 
scurely so; dioicous .................205. Dicranum, p. 100 
Lamina of leaves strongly papillose..... Dichodontium, p. 99 
Lamina of leaves smooth..............-.-06- Dicranella, p. 98 
Peristome distinctly twisted, teeth 32.................-0- 20 
Peristome not twisted, teeth 16, often deeply cleft........ 22 
