36 
62. DimymocniaEna, Desv. 
1. D. truncatula, J. Sm. Aspidium truncatulum, Sw. Didymochlaena 
sinuosa, Desr. 
Has. Tropics of South America, and Malayan Islands. Received from 
the Messrs. Loddiges in 1838. 
63. Cycropettis, J. Sm. 
(Aspidii sp. Sw. Lastrese sp. Pres/.) 
Veins thrice dichotomously branched. Venules free direct, the lower ante- 
rior and exterior ones fertile. Sporangia medial or terminal. Sort 
round, furnished with an orbicular peltate indusium and disposed in 
two transverse rows. Rhizoma cespitose. Fronds pinnate, from one 
to three feet high, pinne falcate-lanceolate, smooth, four to five inches 
long, sessile, irregularly cordate or auriculated at the base and arti- 
culate with the rachis. 
1. C. semicordata, J. Sm. Aspidium semicordatum, Sw.; Plum. Fil. t.113. 
Has. Jamaica and other of the West Indian Islands. Introduced by 
Mr. N. Wilson in 1844, 
Oss. It has often occurred to me, that the Aspidiwm semicor- 
datum of Swartz, did not well associate with any of the numerous 
species of Zastrea, under which genus it has been placed by 
Presl, as well as by myself in my ‘Genera Filicum’; and it was 
not till recently that I had the opportunity of examining a living 
plant, which led me to separate it from Zastrea. I find that it 
belongs to that peculiar group of ferns which have the pinne 
distinctly articulated with the rachis; and, on viewing its whole 
_ character, I have no hesitation in placing it in affinity with 
Nephrolepis, differing from that genus in the ceespitose character ° 
_ of its rhizoma, and in having a double series of sori on both sides 
of the mid-rib. It also, in habit and venation, forms another 
affinity with Poloma and Leptopleura in the tribe Dicksonia. 
Besides the above cited species, there is another from the 
island of Luzon, which is so similar in appearance that Presl 
considered it the same as Swartz’s species from the West Indies ; 
_ but, on comparing the two, it will be seen that they differ in the 
position of the sori: the Luzon plant having ¢erminal fructifi- 
cations, and the West Indian plant /atera/. In my ‘ Enumeration 
_ of the Philippine Island Ferns’, in the 3rd vol. of the ‘Journal 
_ of Botany’, I named the Luzon plant Lastrea Presliana; but, 
by some inadvertency in wording the passage relating to the 
position of the sori, it is made to appear the reverse of what is 
