178 Акт СЕАЕ 
4 Class ANTHOCEROTES. 
The class Amthocerotes (see page 9) comprises the single 
order Anthocerotales and the single family Anthocerotaceae. 
ANTHOCEROTACEAE. 
G 
ular, or semiorbicular, more or less lobed or radiately dissected, 
sometimes subpinnate (Dendroceros), or ribbon-shaped and sub- 
dichotomously branched, with, or more frequently without, a well- 
defined costa, usually of several layers of cells, often with interior 
also on the dorsal, with inconspicuous clefts (“ stomata,” “ muci- 
lage-slits yj the thallus becoming through these infected with 
Nostoc colonies; cells with a single large chloroplast which com- 
y the elongating capsule and remaining as a sheath about its 
base, or (in Notothylas) irregularly torn by external agencies. 
porogonium consisting of a pod-like, usually erect and much 
elongated Capsule, a bulbous foot, and a short intervening zone 
occupied by a long-active meristematic tissue ; capsule dehiscing, 
with rare €xceptions, from the apex downward by two valves, its 
Walls containing chlorophyll and in most species of Anthoceros 
bearing Stomata, each with two crescentic guard-cells ; a slender 
E 
