22 
50. Taxithelium. Leaves obtusate or shortacumi. _ 
nate; cells seriate; costa indistinct. Lid of the capsule - 
not rostrate. Stem without paraphyllia. E 
b. Leaves not mamillose. Stem without paraphyllia. 
51.. Plagiothecium. Lid of the capsule usually not 
rostrate. Alar leaf-cells not numerous, often indistinct; . 
apical cells narrow; costa mostly indistinct or short and — 
double. oa 
52. Stereophyllum.. Lid of the capsule rostellate. 
Alar leaf-cells small but very numerous; upper cells sub- 
oval; costa long and simple. re 
IV.. Amblystegiece. Leaves neither distichous nor -— 
faleate, rarely recurved at the borders; alar cells polygonal 3 
or indistinct; middle cells generally oval-oblong. Lid of 
the capsule not rostrate; pedicel smooth. Stem without 
paraphyllia. — Tufts usually not shining. Leaves mostly 
small. a ie 
98. Amblystegium. Leaves not limbate, all acu- — 
minate and acute; costa often short and double (or indi- 
stinet). | : 
94. Platyloma (new genus) Leaves broadly lim- 
bate- by linear cells, those of the branches obtusate; costa 
long and simple. NUR. "rm 
j V. Hypnec. Leaves generally not distichous, often 
falcate; alar cells polygonal or indistinct; upper and middle 
cells generally narrow. Lid of the capsule often rostrate; 
pedicel often rough. - Stem less often with paraphyllia. - 
Here belonging genera are rather subgenera of Hyp- 
num and not wholly distinct. ae 
.. @ Leaves generally obtusate (at least those of the 
Stem) not triangular; costa often short and double, Li 
of the capsule not rOstrate; pedicel smooth. Stem without 
= partephylia — pe ee eee ae 
. 55. Calliergon (new genus). Leaves of the bran 
b. Leaves acuminate and acute, generally triangula 
