by its bands of sori being disposed in recurved or deflected, 

 transverse lines. When fully in fruit the lines of sori are so 

 abundant that they remind one of a leopard's or, perhaps more 

 correctly, a tiger's skin, a resemblance hinted at in the specific 

 name. The frond, in old specimens, becomes more compound 

 than our figure represents, but the size of our Plate necessitated 

 the selection of a small specimen for illustration. The specific 

 character is however equally obvious in small as in larger in- 

 dividuals. 



As yet we have seen no specimens but those collected at 

 Fremantle, where the plant is rather rare, occurring only in the 

 drift after heavy gales, and is probably cast up from deep water. 



The commonest Australian Haliseris has been named H. 

 Muetteri by Sonder. and differs from the present species not only 

 in size, habit, and tenacity of membrane and colour, but more 

 essentially in the much effused, not lineated sori, which cover 

 wide spaces of the frond. In a younger and barren state it 

 is scarcely distinguishable from some forms of H. polypodioides, 

 with which it was formerly confounded by me {Alg. 2 asm. in 

 Hook. Journ.). 



A third Australian species {H. australis, Sond.) differs from 

 both the preceding in having its very thin, wide lamina traversed 

 with slender parallel veinlets, running obliquely from the midrib 

 to the margin. It is very rare, and was discovered by Dr. 

 Mueller at Cape Lefebre, South Australia. 



Fig. 1. Haliseris tardalis, — the natural size. 2. A portion of the lamina 

 and midrib, — magnified. 3. Spores, — more highly magnified. 



