360 Boodle. — Anatomy of the Schizaeaceae . 
the Hymenophyllaceae, but the dialystelic stem of Anemia 
Phyllitidis has no counterpart in that Order. Seedling plants 
of both these types were examined, in order to trace the 
manner in which the structure of the mature stem is attained 
in the ontogeny of the plant, and if possible to draw some 
conclusion as to the homologies of the mature structure. 
Especially in the case of Anemia and Schizaea several 
anatomical points have been left for further investigation, 
and as new material of some species has recently been 
obtained, it is intended to publish some additional observa- 
tions at a future date. 
In the Schizaeaceae Hooker and Baker (’74) include five 
genera : Schizaea , Sm., Anemia , Sw., Mohria , Sw., Trocho- 
pteris , Gardn., and Lygodium , Sw. Trochopteris , which is 
represented by a single species, is placed by Prantl (’81) 
as a subgenus of Anemia l , thus reducing the genera to four. 
Material of Trochopteris was not obtained, but the structure 
was investigated in Lygodium , Schizaea , Anemia, and Mohria, 
and the results will now be described, and will be arranged 
under each genus taken in the order just given. 
Some further observations on the sieve-tubes and bundle- 
fibres of the Hymenophyllaceae are included towards the end 
of the paper, where a more general treatment of certain tissues, 
&c. is given. 
Lygodium, habit. 
The stem of Lygodium is a horizontal rhizome often much 
branched at short intervals, and apparently dichotomously, 
but with some of the branches occasionally arrested. The 
roots are borne on the lower surface, without marked regularity, 
but approaching distichous arrangement in places. The leaves 
are borne at short intervals on the upper surface of the 
rhizome, and according to Prantl (’81, p. 2) form a single 
row. This is often approximately correct, but especially 
where the leaves are rather crowded, they tend to distichous 
1 Prantl and other authors write the generic name Anei?nia , in order to make 
its Greek derivation correct. 
