ee FILICALES 
by curling over of the margin of the pinnule, as in AZohrv7a and Schizaea, 
and in some degree in Axuetmia: or there may be a special protective 
growth, comparable to the indusium of the Hymenophyllaceae, which 
completely covers each separate sporangium, as in Lygodiuvm (Fig. 301). 
Disposition of the sporangia of the Schizaeaceae. 4 =Sch. dichotoma, |. Sm., part of 
a fertile segment (sorophore). 4, C=Lygodium japonicum, Sw. B=z2pex of a young 
fertile segment. C=mature fertile segment, at (.°) the sheaths have been removed, so as 
to display the sporangia. D=Johria caffrorun (L.) Desv., segment of a fertile pinna. 
kA, bk =Aneinia Phyllitidis, Sw. /=side view of a young fertile segment. /“=fertile 
segment from below (4, &, A after Prantl C, ), # after Diels, from Engler and 
Prantl, Vat, Planzenfam.). 
Spork-PRODUCING MEMBERS. 
These in the Schizaeaceae are simply the solitary sporangia, each of 
which Prantl recognised as constituting a “ monangial sorus.” He accurately 
worked out their development, and found them to arise in acropetal order 
on each fertile segment: he ascribes to them all an origin from cells of 
the marginal series, with a terminal position on the fertile vein. Con- 
sequently the protecting flanges must, according to his account, be accessory 
growths from the adaxial surface of the leaf. As Diels remarks, however, 
extended and renewed investigations are desirable before this is finally 
accepted.!. It seems improbable for Sc/zsaea, and still more so for certain of 
the related fossils: from their mature position in these it would appear 
Nat. Pflansenfam., i., W., p. 360. 
