41 6 Boodle . — Anatomy of the Schizaeaceae. 
den Strangquerschnitt zerstreut,’ but this is not correct. The 
protoxylem elements of the stem were recognized by Prantl 
as scalariform in Schizaea , but for the other genera he 
describes them as reticulate, which has not been confirmed. 
Prantl records the agreement of Mohria with most Anemias 
in the structure of its bundles. 
Bauke (’ 78 , p. 642) shows that Anemia and Mohria exhibit 
a special type of development in their prothalli, distinct from 
that of the Polypodiaceae, and points out that this resem- 
blance is of importance, as these two genera are unlike in habit. 
This indication of affinity fits in well with the anatomy. 
Russo w (’ 72 ) gives a short account of the anatomy of the 
Schizaeaceae (p. 97). In the stem of Lygodium he refers to 
the irregular order of development of the tracheides. He 
also describes the fibres in the petioles of Schizaea and 
Anemia. The petiole- bundle of Anemia is fairly correctly 
represented in his diagram (PI. X, Fig. 9), except that the 
protophloem is drawn as continuous. In Schizaea pectinata 
also (PI. X, Fig. 7), the protophloem is made to surround the 
xylem. 
Thomae (’86, p. 155) quotes several of Prantl’s statements 
with regard to the Schizaeaceae and does not add many new 
observations. 
Britton and Taylor have given an account of the life-history 
of Schizaea pusilla 1 . The structure of stem and petiole as 
described by these authors agrees in type with 5 . digitata. 
Summary of some of the Results. 
1. The sieve-tubes of the Schizaeaceae and Hymenophyl- 
laceae do not appear to form callus, but in other respects 
(perhaps excepting Schizaea ) agree structurally with the 
sieve-tubes of other Ferns. 
1. Silica-nodules occur in the cavities of parenchyma-cells 
in some species of Lygodium and Anemia. 
3. The fibres in the petiolar bundle of some species of 
1 I am indebted to Mrs. Britton for material of this species, but have not yet 
made any preparations of it. 
