REPORT ON BURBIDGE’S FERNS OF THE SULU ARCHIPELAGO.

By J. G. Baker, F.R.S., F.L.S.

The Sulu Archipelago is a group of small islands lying between Borneo and the Philippines. They are for the most part under cultivation; but there are two mountains which attain an elevation of between two thousand and three thousand feet. So far as I am aware their botany is entirely unknown. The following is a full catalogue of the ferns which Mr. Burbidge gathered in the group:—

38.* Cyathea suluensis, Baker, n. sp.—Allied to C. integra, J. Sm., of the Philippine Islands and Amboyna.
Hymenophyllum dilatatum, Sw., var. H. formosum, Brack.
Trichomanes javanicum, Blume.
Trichomanes maximum, Blume.
Trichomanes rigidum, Sw.
Davallia pinnata, Cav., and its variety luzonica.
Pteris quadriaurita, Retz.
4.* Pteris Treacheariana, Baker, n. sp.—Near P. cretica, but much more slender and delicate in general aspect, with the lowest one to three pairs of pinnæ two to three forked. Named at the request of Mr. Burbidge in compliment to the Honourable W. H. Treacher, Acting Governor of Labuan, whose kindness and help contributed materially to the success of his expedition.
Lindsaya cultrata, Sw.
Lindsaya pectinata, Blume.
Lindsaya flabellulata, Dryand.
Lindsaya lobata, Poir.
Lindsaya davallioides, Blume.
Asplenium persicifolium, J. Sm. An endemic Philippine species.
Asplenium resectum, Smith.
Asplenium falcatum, Lam.
Asplenium hirtum, Kaulf.
Asplenium cuneatum, Lam.
Asplenium Belangeri, Kunze.
Asplenium pallidum, Blume.
Asplenium bantamense, Baker.
Asplenium cordifolium, Mett.
Nephrodium melanocaulon, Baker.
27.* Polypodium (Phegopteris) oxyodon, Baker, n. sp.—A very distinct plant, allied to P. caudatum of Tropical America.
175.* Polypodium (Eupolypodium) Leysii, Baker, n. sp.—Allied to P. taxifolium and apiculatum of Tropical America. Named at the request of Mr. Burbidge in compliment to the Honourable Peter Leys, M.B., Colonial Surgeon, Labuan, who materially aided him during his residence there, and accompanied him on one of his expeditions into the interior.
Polypodium albo-squamatum, Blume.
Polypodium palmatum, Blume.
Vittaria elongata, Sw.
Antrophytum reticulatum, Kaulf.
Tænitis blechnoides, Sw.
Gymnogramma Wallichii, Hook.
Osmunda javanica, Blume.
Lycopodium Phlegmaria, Linn.
Selaginella caulescens, Spreng.
Selaginella Willdenovii, Baker.
Selaginella conferta, Moore.
Selaginella caudata, Spreng.
Selaginella atroviridis, Spreng.