Acrogynous Jungermattniales. 285 
behaviour. The interior of the marsupium is frequently lined by 
outgrowths bearing papillae which secrete a gummy liquid (Fig. 51 , 
V.), and the wall of the marsupium may be strengthened by a net¬ 
work of thick-walled cells. 
Fig. 52. Frullanici dilatata. A, a perigonial leaf (male bract), from ventral 
surface, showing two antheridia ; B, C, antheridium in apical view and in 
longitudinal section ; D, longitudinal section of perianth with two archegonia ; 
E, transverse section of same ; F, longitudinal section of perianth showing 
embryo in fertilised archegonium, with unfertilised archegonium on the right; 
G, a series of longitudinal, and H, a series of transverse sections of embryos 
of different ages; I, J, K, L, longitudinal sections of older sporogonia, to show 
development of spores and elaters. 
