Apospory. A =Soral-apospory of Athyrium filix foentina, 
var. clarissima. Jones. Part of a pinnule with veins (7) 
anda sorus. In the latter, in place of the sporangia, prothalli 
are formed (7th) with antheridia (azzh) and archegonia 
(arch). X40. B=apical apospory of Polystichum angulare, 
var. pulcherrimum. Padley. A prothallus at the up of a 
pinnule, as a direct continuation of it. g/=marginal glands, c=the cushion. 
x20, C=the first initiation of a prothallus as in 2, at the apex of a pinnule. 
‘The shading indicates a vein beyond the tip of which the prothallus arises. 
x130. D=a similar growth, but borne on an elongated cylindrical process: 
archegonia (arch) are already present. X10. £=soral apospory in Polystichum 
angulare, var. pulcherrimum. A prothalloid growth bearing an antheridium 
(auth) and rhizoids (Z) has arisen from the stalk of a sporangium. X70. 
