Boodle . — Anatomy of the Schizaeaceae. 365 
L . dichotomum , it will only be necessary to mention a few 
differences of detail, observed in other species. The stele 
of L. pinnatifidum , Sw., is similar to that of L. dichotomum , 
but smaller. Silica-nodules are present, but in the specimen 
examined were less numerous. The walls of the suberized 
cells of the inner cortex become brown in the old rhizome. 
In L.japonicum , Sw., the protoxylem of the rhizome was seen 
to be similar to that of L. dichotomum: No siliceous nodules 
were observed. In L, scandens , Sw., the small scalariform 
tracheides are at the periphery of the xylem as in the other 
species, but they are less numerous and less regularly dis- 
tributed than in L. dichotomum. The layer of suberized cells 
is several cells thicker than in that species, and much more 
lacunar in transverse section, adjacent cells being often com- 
pletely rounded off from one another with the exception of 
a narrow neck-like prolongation connecting them and divided 
by a cross-wall at the middle point. Chains of intercellular 
spaces between the cells are seen in a tangential section as in 
the other species. In L. palmatum , Sw., the inner cortex 
instead of being represented by lacunar suberized cells, 
consists of sclerotic cells, which showed no intercellular 
spaces. In L. reticulatum , Schk., the tracheides of the 
rhizome are specially thick-walled, and no layer of suberized 
cells was observed. In L. volubile, Sw., the rhizome is of the 
usual type ; the layer of suberized cells is yellowish and fairly 
lacunar. 
The branching of the stem in Lygodium appears to be 
dichotomous, but no stage was met with, sufficiently early 
to prove whether it is a case of true dichotomy. The stele 
elongates so as to become oval, then becomes constricted into 
hour-glass form, and divides into two about equal-sized steles. 
No definite relation between the branching and the leaf- 
insertion could be made out, but in one or two cases a leaf- 
trace was attached to the stele just where it forked, in 
a median position, and the tracheides of the leaf-trace were 
attached to tracheides supplying the xylem of both branches. 
The apex of the rhizome, examined in the seedling of 
