Sect. I. ACROCARPI.
Fr. terminal (or in a few instances cladocarpous).
Division A. Capsule without a deciduous lid.
a. caps. bursting irregularly.
Archidium (3). Perennial; caps. globular, sessile; calyptra thin and membranous, irregularly torn in the middle; spores large; infl. monoicous; barren fl. gemmiform, two-leaved or naked in axils of perichætial leaves. PAGE 26.
Phascum (4). Annual. Caps. ovate or roundish, very shortly pedicillate; calyptra campanulate; spores small, roughish; infl. monoicous; barren fl. gemmiform either at base of plant, or axillary, rarely terminal and discoid. 26.
b. caps. bursting regularly.
Andreæa (1). Caps. oval erect, opening by four longitudinal slits, sessile on a stalked vaginula; calyptra mitriform, thin; spores small, at first clustered together in fours: perennial. 21.
Division B. Capsule with a deciduous lid.
I. Peristome none.
a. caps. sessile on a stalked vaginula.
Sphagnum (2). Perennial, aquatic; caps. globular,
