12 TRANSACTIONS AND PROCEEDINGS OF THE [Sess. LXV. 



but it has the honour of occupying a genus by itself. It is 

 distinguished by its fan-like dichotoniously divided fronds, 

 and by its curious fringe-like fertile appendages on the 

 terminal margins, the capsules mixed with chestnut- 

 coloured hairs. It is not so rare, I believe, on the 

 mainland of South America, opposite the West Indian 

 Islands. It was one of the plants brought from Mount 

 Eoraima. 



The other fern I would mention is still more curious 

 and rare, and I possess only a single small frond of it. 

 It was originally discovered by my friend, Mr. E. F. im 

 Thurn, on that same Mount Koraima, from which he 

 brought so many interesting things in 1884, and there is 

 a drawing of it in the Botanical Transactions of the 

 Linntean Society for July 1887. It has been named 

 Enterosora Campbdlii, Baker. Three years after its original 

 discovery, it was found in Jamaica " on the tops of high 

 trees in the forests where LaMa monopliylla grows, Kose 

 Hill and Greenhill Wood, St. Andrew Parish." It is very 

 like Polypodinm trifitrcatum, Linn., in outward appearance, 

 so much so that it was confounded by the discoverer with 

 that fern. But its fructification is very different. The 

 sori are at first immersed in the substance of the frond, 

 and at length are partially seen on the lower surface 

 through narrow oblique slits, that look as if they had been 

 made with a penknive through the epidermis. There is 

 no other species known. The fronds attain a length of 

 six inches, so that my frond is a very small one, but the 

 peculiar fructification is distinctly seen on it. I am sorry 

 to say I did not find a plant of it. It may be regarded as, 

 at present at least, one of the rarest ferns in the world. 



I must apologise for addressing you on a subject that 

 cannot be interesting to all of you, and the fact that our 

 Society does not limit its scope to the flora of our own 

 islands, but concerns itself with the botany of every land, 

 must be my excuse. 



Note. — In the preparation of this paper I have been greatly assisted 

 by the "Synoptical List, with Descriptions, of the Ferus and Fern- 

 Allies of Jamaica, by G. S. Jennian, Superintendent, Botanical Garden, 

 Demerara," published in the Bulletin of the Botanical Department, 

 Jamaica. 



