A NEW HYBRID ASPLENIUM S| 
it might at first be thought an extreme state. It ex- 
hibits considerable diversity, however. The smaller, 
stockier individuals most resemble A. pinnatifidum in 
their wholly green rachises and thick leaf tissue; but 
they differ from A. pinnatifidum very definitely in their 
fewer fronds, sessile basal pinnae, acuminate (never 
long-attenuate or filiform) lamina, and brown stipe. 
The largest individual seen is that selected as the type. 
This suggests, rather, the more specialized parent, A. 
Bradleyi, since it agrees in thinner leaf texture and 
slender stipe, and shows an approach to dark brown 
tachises; it differs from A. Bradleyi in its very much 
simpler pinnae and less sharply cut margins, and in 
having the rachis: at least faintly winged. All the 
Plants of the hybrid agree with A. Bradleyi in their 
ark brown sori, the sori of A. pinnatifidum being cin- 
‘amon brown. The intermediate dissection of the 
pinnae has already been indicated; the form of the 
margins is no less distinctive, being midway between 
the subentire or crenulate margin of A. pinnatifidum 
and the sharply toothed margin of A. Bradleyi. The 
thizome scales also are exactly intermediate; they are 
Similar in outline to those ‘of A. Bradley’, but have the 
cells much smaller and separated by thinner partition 
walls, in both particulars approaching A. pinnatifidum. 
he spores have not been tested for viability; but 
that the cross is sometimes fertile seems not improbable 
fom Mr. Graves’ having recently found a clump of | 
eight well-developed plants growing together. 
at the hybrid here described has remained So 
long undetected may be owing partly to the comparative 
farity of A. Bradleyi and partly to the fact that it and 
& Pinnatifidum possibly do not often occur in close 
Proximity, in spite of their nearly coextensive ranges. 
Asplenium Gravesii is represented in the National Her- 
Only by Mr. Graves’ recent specimens. 
Wasuincron, sos 
