304 
ASPLENIACE^. 
observed the involucre, but at the same time his remarks will 
show that he considers the species as belonging to the family in 
which I have placed it. “ With respect to Ceterach having an 
indusium, you will see that, according to my view, in the ‘ Jour- 
nal of Botany ’ I have placed it in Aspleniece, which tribe is 
characterized as having the sporangia produced on one or both 
sides of the veins, and furnished wdth an indusium that rises 
from the same axis, but more from the upper side (or surface as 
it may be termed) of the vein, the sporangia being in the early 
state pressed down by it, and in true Asplenium pointing in- 
wards, — that is, to the primary midrib of the segment or pin- 
nule, &c. Now although I can find no evident indusium in 
Ceterach^ yet the circumstance of the sporangia being lateral is 
of itself sufficient to induce me to consider it as belonging to 
Asplenie<By and the absence of an indusium is, in my opinion, 
owing to its being suppressed by the dense mass of scales com- 
mon to the plant. In my character of the genus Ceterach I 
have said ^ indusium obsolete,’ and although I have not seen 
anything like a membrane, still there is a thickening of the vein 
above the axis of the sporangia.” 
