appropriate one of Kunze, phledodes, judging from the dates of 
the respective volumes in which they have appeared: Martius’, 
1828-84, Kunze, 1835. One of the striking characteristics of the 
plant is the very conspicuous prominent veins, especially beneath : 
to this may be added the large and handsome fronds, the great 
size of the pinnules, their almost entire margins, and the broader 
and lanceolate fertile pinne, as the distinguishing features from 
the Acrostichum sorbifolium, Linn. And, if we were to con- 
fine our attention to the two as cultivated in the Tropical Fern- 
house at Kew, there are few Botanists who would not pro- 
nounce them very distinct. Unfortunately my herbarium pos- 
sesses such a suite of specimens of the latter as greatly to invalidate 
the soundness of the specific differences. In both the pinne are 
jointed upon the rachis; in both the caudex is long, stout, 
branched, scandent, and fusco-paleaceous: in 4. sordifolium the 
venation is occasionally very prominent, and the pinnze also vary 
a good deal in size; while in 4. Yapurense I have seen the fer- 
tile pinnze almost as narrow and as linear as in sorbifoliwm. 
In our present plant, as in sorbifolium, there are abnormal 
forms of the pinnee; not unfrequently the sterile ones are sud- 
denly contracted into a caudato-cuspidate point, and sometimes 
they are partially converted into fertile ones (the rest sterile), 
as figured by Fee, in his Lomariopsis Prieurtana. In one of 
my specimens, from British Guiana, the terminal pinna is alone 
partially fertile, and there the capsules are confined to the veins. 
PiaTe 57. Fig. 1. Apex of a caudex, and base of a stipes of Acrostichum 
(Lomariopsis) Yapurense, Mart. 2. Portion of a sterile frond, and fig. 3 of a 
fertile one :—natural size. 4. Portion of a sterile pinna, showing the venation. 
5. Portion of a fertile pinna, with part of the capsules removed :—magnified. 
