Boodle . — A natomy of the Schizaeaceae . 4 1 5 
possession of sclerosed sieve-tubes is common to both genera, 
and there is a single petiolar bundle in both, of a somewhat 
similar form, and it is endarch. On the other hand, Loxsoma 
has more numerous protoxylem-groups, and there is no 
median group. At the top of the petiole, however, there are 
only four groups, two in the hooks of the xylem, about as 
in Anemia , and two at the ends of the top of the arch. These 
two may have originally been produced by splitting of a 
median group, as has been supposed in the case of Lygodium. 
The distribution of the fibres in Loxsoma is different from 
what occurs in Anemia ; they extend nearly all round the 
xylem. Another point of difference is that in Anemia the 
spiral elements of the leaf-trace are continued a short way 
down the stem. Further, the only solenostelic forms in 
Anemia are probably to be regarded as reduced from dialy- 
stelic forms ; and these latter would show less resemblance 
to Loxsoma in stem-structure, than the species chosen for 
comparison ; though this is perhaps less important. 
Reference to Literature. 
A few further allusions to Prantl’s work on the Schizae- 
aceae and to that of one or two other authors ought to be 
made. A full description of the form and veining of the 
leaves, and of the fructifications, is given by him. He also 
gives a detailed account of the vegetative structure, which is 
to a great extent correct. He recognized that the distinction 
between the solenostelic and dialystelic species of Anemia 
is one of degree, and is related to the phyllotaxy (p. 22). 
Only a few special points in his account of the anatomy need 
be referred to. In Schizaea elegans some large reticulate 
tracheides on the median lower side of the petiole-bundle 
are described as being the first to differentiate (p. 24). If 
this is correct, it is different from S. digitata. The petiole 
of Anemia Phyllitidis is well described and figured. In the 
petiole of A. coriacea a curious bundle-structure is described, 
in which the xylem is separated into two bands. In the stem 
of Lygodium the protoxylem is stated to be ‘ regellos liber 
