THE BLACK MAIDENHAIR SPLEENWORT. 89 
the Rev. J. M. Chanter, who found it at Manaton in Devonshire. 
It is the same as the Asplenium silesiacum of Milde. 
12. microdon (M.). This is quite distinct from all other forms, 
and like the variety microdon oÊ Asplenium lanceolatum does not, at 
first sight, appear to belong to the species to which it is referred: 
both these plants rather resemble Asplenium marinum, with which, 
however, they do not agree in any essential particular. The 
present when young was referred to the above-named variety of 
lanceolatum, as a somewhat deltoid form, but now that it has become 
mature, its fructification sufficiently separates it. The fronds are 
six or eight inches high, broadest at the base, where they measure 
nearly three inches across, pyramidal or elongate-deltoid with an 
irregular outline resulting from the unequal length of the pinne ; 
they are pinnate at the base, the pinne being there distinct, but 
«they become slightly adnate and decurrent above, and in the upper 
part are quite confluent into a broad irregular pinnatifid apex. 
The outline of all the distinct pinn; is more or less hastate, the 
base being produced into a rounded auricle both on the anterior 
and posterior sides; this is most so in the lowest pinnz, in which 
the auricles become lobes divided half way down to the costa; the 
base of these lower pinne is thus somewhat cordate-hastate, whilst 
above the auricle they taper off to an acute point and acquire a 
.pyramidal figure. "The margin is everywhere minutely and sharply 
denticulate. The most developed form we have seen, has two or 
three rounded lobes, besides the basal one, on each side the pinne. 
The sori are numerous, elongate, placed near the costa, very fre- 
quently scolopendrioid, sometimes diplazioid. This remarkable plant 
‚has been found in Guernsey by Mr. C. Jackson, and in Devonshire 
by the Rev. J. M. Chanter, and more recently in the neighbourhood 
of Barnstaple, by Mr. Jackson. - 
13. depauperatum (M.). The only examples we have seen of this 
form are dwarf, not more than two inches high; and the parts are 
all diminutive and irregularly depauperated. It was found in 
Westmoreland, on Whitbarrow, by Mr. F. Clowes. 

