Bower.—-Studies in the Phytogeny of the Filicales. VII. 53 
examples of this species the indusial flap is reflexed; 1 but in others it may 
be found expanded in the plane of the pinnule. This state is shown in 
Fig. 39, which was drawn from a specimen brought from Jamaica as 
H. repens , though it may be one of those transitional forms to Polypodium 
punctatum which have been noted by so many collectors. Both the species 
named are native in Jamaica. It will be noted that the sorus is consider¬ 
ably extended along the vein, and that the latter, instead of terminating at 
the receptacle, extends onwards for an appreciable distance into the rounded 
marginal lobe, which thus represents the upper (adaxial) indusium. It is 
this lobe which in typical forms of II. repens curves over and protects the 
Fig. 40. a . Young sorus of Hypolepis repens 
cut vertically, u.i. upper indusium, traversed by 
a vascular strand; v.i. = vestigial ovver indusium. 
(x 15.) b. Small part of the soral surface in¬ 
cluding the vestigial indusium ( v.i .), more highly 
magnified, (x 160.) 
sorus. The extension of the vein into the indusial flap will be important 
for comparison with other cases, for it plainly discounts the value of the 
relation of the sorus to the vein-ending. 2 
A vertical section through such a sorus, following the vein (Fig. 40), 
shows how greatly the receptacle is extended and flattened, while the vein 
is seen continuous far into the distal indusial flap, upon which sometimes 
isolated sporangia and hairs may be scattered for some distance upwards. 
If in presence of these palpable differences from II. nigrescens any doubt 
were felt of the relation of this form to H. nigrescens , and ultimately to 
1 Cf. Hooker, Sp. Fil., vol. ii, PI. XC, B. 
2 Compare the extension of two vascular strands into the indusial cup in Davallia dissecta , 
Goebel, Flora, Bd. cv, 1912, p. 47, Fig. ir. 
