THE LANCEOLATE SPLEENWORT. 73 
athyrioid. The denticulated margin with its small patent apiculated 
teeth is remarkable; and the small short dispersed sori, which in 
their disposition follow rather the margin than the midrib, point to 
Asplenium lanceolatum as the species to which it is to be referred, 
although it is very much unlike the fully developed state of that 
species. The mode of division, the toothing, and the texture agree 
also with Asplenium lanceolatum. Small plants resemble Asplenium 
marinum in the scaly crown, pinnate fronds, and margined rachides, 
but the texture and fructification are quite at variance with that 
species. Some Devonshire plants at first referred here, prove to 
be analogous forms of Asplenium Adiantum-nigrum, having deltoid 
fronds and elongated central sori. The variety microdon is a native 
of Guernsey, and was found in 1855, first by Miss Wilkinson, and 
subsequently in other stations by Miss Mansell, of the Quesne, and 
Mr. C. Jackson, to the latter of whom we are indebted for specimens, 
and for our knowledge of the plant. Mr. Jackson informs us that it 
grows on banks of rough masonry without mortar, and intermixed 
with Asplenium lanceolatum, at some distance from the sea. It has 
since been found within a short distance of Penzance, by Mr. G. 
Wager, and this plant which is somewhat more divided than the 
Guernsey form. proves incontestably its relationship to the species to 
which we refer it. [Plate LXIX.] 
2. Claphamii (M.). This is a very curious form closely allied to 
microdon, but apparently distinct, the fronds being still narrower, 
almost parallel-sided with an irregular or sinuated margin, and a 
short narrowed apex. The stipes and rachis are brown and scaly as 
in the species itself, and in microdon. The fronds are linear acute, 
the largest yet produced about five inches long exclusive of the short 
stipes, and three-fourths of an inch wide, pinnate in the lower part. 
The pinne are nearly equal in size, much imbricated, sessile with a 
narrow attachment at the base, becoming more and more adnate 
upwards, till in the upper half they become confluent; the lower 
ones are shortly and bluntly triangular, about the size and form of 
those of Woodsia alpina; above these they become obliquely but 
transversely oblong, from the upper or anterior basal angle growing 
out to about the same form and size.as the pinna itself; in the upper 
half they all become confluent, so that this part of the frond is 

