8 Bower.—Studies in the Phytogeny of the Filicates. VII . 
indicate a slight acropetal sequence. The sporangia themselves follow the 
characters already well known. If sections be cut transversely to a number 
of pinnae, their relations to one another appear as in Fig. 9. They 
alternate in position, and their sporangia dovetail one with another so that 
collectively a reasonable degree of protection is attained. It may be noted 
how closely their indusial flaps are placed ; and though a careful re-examina- 
Fig. 7. Transverse section of the rachis and longitudinal of 
the bases of two pinnae of Schizaea rupestris , the xylem indicating 
the adaxial face. (X85.) 
Fig. 8. Longitudinal 
section of a young pinna of 
Schizaea rupestris, showing 
the slightly acropetal se¬ 
quence of sporangia. ( x 85.) 
Fig. 9. Transverse section through a number of pinnae, showing their relation 
to one another. ( x 35.) 
tion of them and of the f sporocarp ’ of Marsilia will be necessary before 
any close comparison can safely be made, still it lies close to hand to 
suggest that by a ‘ webbing’ of the pinnae of Schizaea something very like 
the ‘ sporocarp 5 of Marsilia would be attained. 1 
The other species examined was 5 . digitata, supplied by the Director 
of the Botanic Gardens at Singapore. It is interesting as showing in two 
1 There is some variety of detail in the position of the vascular strands in sporocarps of different 
species of Marsilia. These will have to be compared among themselves, and with the vascular 
arrangement of various species of Schizaea , before any conclusion can be reached as to the details of 
the fusion of lobes suggested, so as to constitute the sporocarp ; and the question is further complicated 
by the receptacular strands present in Marsilia . See Duncan Johnson, Ann. of Bot., xii, 1898; 
Bot. Gaz;, xxvi, 1898. 
