Boodle. — Anatomy of the Schizaeaceae. 417 
Lygodium , Schizaea , and Anemia are to be regarded as modi- 
fied sieve-tubes. The fibres in Trichomanes Prieurii appear 
to be formed, either all from parenchyma, or some from 
parenchyma and some from sieve-tubes. 
4. The species of Lygodium are very uniform in structure, 
and possess a solid stele ; Schizaea has a medu Hated stele, 
while dialystelic structure is found in Mohria and some 
species of Anemia , solenostelic structure in others. 
5. The seedling of Lygodium does not suggest reduction 
from a more complicated type. 
6. In the seedling of Anemia the solid stele is converted 
into a dialystelic one, by gradations similar in type to those 
found in Pteris for instance ; but no very definite morphological 
conclusions should be drawn from this fact. 
7. The protoxylem belonging to the stem in the Schizaea- 
ceae is scattered, does not include spiral elements, and is 
differentiated mostly with no relation to the leaf-traces. 
8. The petiole possesses a single bundle. 
9. The roots appear to be diarch throughout. 
In conclusion it may be said that anatomically the Schi- 
zaeaceae form a most interesting group, and that further 
examination of some of the forms may give useful data, on 
which to base conclusions with regard to the homologies of 
the different types of stelar structure found in the Order. 
I wish to express my thanks to Dr. D. H. Scott, F.R.S., 
for valuable advice and suggestions, and to Mr. J. G. Baker, 
F.R.S., and to Mr. C. H. Wright, A.L.S., for assistance as to 
the specific identity of some specimens. The material ex- 
amined in Mohria and in some specimens of Lygodium and 
Anemia was from plants in cultivation in the Royal Gardens, 
Kew ; in some other species dried material was used. I am 
indebted to Prof. J. B. Farmer, F.R.S., Mr. A. C. Seward, 
F.R.S., to Dr. J. C. Willis, and Mr. J. B. Carruthers of Pera- 
deniya, and to Mrs. Britton of New York for kindly presenting 
me with material of species of Schizaea , &c. ; and to Messrs. 
Hill of Edmonton for seedlings of Anemia Phyllitidis. 
