212 
The Ohio Naturalist. 
[Vol. XIV, No. 2 , 
1. Sporophyte borne on a pseudopodium developed by 
the gametophyte; columella not extending through 
the spore cavity; sporangium without air cavities; 
without or with a calvptra. 
a. Gray-green bog-mosses with two kinds of cells 
in the gametophyte; sporangium opening 
by a lid; archegonium breaking irregularly 
at the tip. Sphagne.e, Bog-mosses. 
Sphagnales, Sphagnaeeae, Sphagnum. 
b. Dark green rock mosses, not with two kinds of 
cells; sporangium opening by four or more 
vertical slits; archegonium developing a 
ealyptra. Andrev£.e, Granite Mosses, 
Andreaeales, Andreaeaceae, Andreaea. 
2. Sporophyte not borne on a pseudopodium, usually with a 
prominent stalk or seta; columella usually extending thru 
the spore cavity; sporangium with an air cavity, usually 
with stomata; archegonium developing a ealyptra. 
Musci, True Mosses. 
B. Archegonia having their venters imbedded in the thallus; 
gametopyhte thalloid, without typical scales; its cells 
usually with only one or two chloroplasts; sporophyte 
with intercallary growth between the foot and the 
sporangium; sporangium with a central columella, open¬ 
ing by two valves, sometimes with stomata. 
Anthocerote.e, Homworts, Antocerotales, 
Anthocerotaceae, Notothylas, Anthoceros, Dendrcceros. 
SYNOPSIS OF THE HEPATIC^. 
I. Gametophyte a thalloid, dorsiventral frond composed of 
several distinct tissue layers; mostly with air passages; 
sporophyte spherical or with a foot and short stalk; 
sporangium rarely opening by 4-8 valves. 
Marchantiales 
1. Sporophyte spherical, without foot or stalk, remaining 
enclosed in the venter of the archegonium; no sterile 
cells in the sporangium. Ricciaceae, Riccia, 
Ricciocarpus, etc. 
2. Sporophyte differentiated into foot, stalk and sporan¬ 
gium, breaking thru the venter of the archegonium 
at maturity; sporangium with spores and sterile 
cells which mostly develop as elaters. 
Marchantiaceas, Targionia, Grimaldia, Conocephalus 
Lunularia, Marchantia, etc. 
