166 ON A NEW GENUS OF FERNS. 
latas). These tubers are exported in great quantities and of 
excellent quality, and called Malaga Sweet Potatos (Patatas 
dulces de Malaga. There is also a commencement made 
towards the production of Cochineal in a few gardens, planted 
on purpose with several kinds of Cactus, allied to Opuntia, 
and I noticed the same branch of industry pursued at Valence 
and already yielding an ample return. 
To be continued. 
Observations on a New Genus of Ferns; by J. SMITH. 
With a Plate, Tas. VII, VIII. 
On referring to the enumeration of the Ferns collected by 
Mr. H. Cuming in the Philippine Islands, published in the - 
third volume of the Journal of Botany, it will be there seen — - 
that I have placed six species under the genus Callipteris ; 
but at page 178 of the fourth volume of the same journal I 
have, for reasons there stated, removed four of them from 
Callipteris, and arranged them in the genus Ozygonium; be- 
lieving one of them (Cuming, n. 116) to be the Diplazium 
alismefolium first described and figured by Presl, in Reli- 
quie Haenkeane; and which that author afterwards, in bis. 
Tentamen Pteridographie, adopted as the type of his genus 
Oxygonium, a genus distinguished from Diplanium by the 
circumstance of the venules anastomosing near the marg 
and forming one series of marginal areoles. Under 
that character I added three additional species, viz. Ory- 
gonium vitteforme, O. ovatum and O. elegans. At the- 
time I did so, I had little doubt, but that these species 3 
were quite characteristic of the genus, not only ™ 
venation, but also in their sori being furnished with m- - 
dusia, as in Diplazium. The only doubt I had, regarde” 
Oxygonium vitteforme (Cuming, n. 329); the evidence 
its being an indusiate fern, not proving so satisfactory 95 
could have been desired; but on making due allowance; for 
