65 



©rtgtual ^xtitlt^. 



REPOET ON BURBIDGE'S FERNS OF THE SULU 

 ARCHIPELAGO. 



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



After leaving Borneo Mr. Bnrbidge sj^ent a month in the Siilii 

 Archipelago, a group of small islands lying between Borneo and 

 the Philippmes. 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 then- 

 botany is entu-ely unknown. The following is a full catalogue of 

 the ferns which he gathered in the group, with descriptions of the 

 novelties : — 



38.* Cyathea suluensis. Baker, n. sp. Fronds ample, tripin- 

 natifid or tripinnate, moderately firm in texture, green and glabrous 

 on both surfaces, with naked pale brown unmuricated rachises, the 

 midiib of the pinnules and tertiary segments furnished with many 

 small white bullate scales. Pinnae sessile, oblong-lanceolate, a 

 foot or more long, five to six mches broad. Pinnules lanceolate, 

 sessile, half to three-quarters of an inch broad, cut down to a 

 narrow wing or occasionally at the base to the rachis into close 

 ligulate- oblong toothed tertiary segments one-sixth of an inch 

 broad. Veins five- to six-jugate, erecto-patent, distinct, deeply 

 forked, the lowest posterior veinlet springing from the costa of the 

 pinnule, not from that of the tertiary segment. Sori rather small, 

 placed at the forking of the lower veins, medial as regards the 

 segment. Involucre persistent, hemispherical, entire or slightly 

 broken up as it matures. — Allied to C. integra, J. Sm., of the Philip- 

 pine Islands and Amboyna. 



Hijmenophyllum dilatatum, Sw., var. H. fo7inosum, Bvack. 



Trichomanes javanicum, Blume. 



Trichomanes maximum, Blume. 



Trichomanes rigidum, Sw. 



Davallia pinnata, Cav., and its variety luzonica. 



Pteris quadriaurita, Retz. 



4.* Pteris Treacheriana, Baker, n. sp. Caudex erect. Stipes 

 densely tufted, very slender, naked, purple-black, four to eight 

 inches long. Fronds oblong-lanceolate, simply pinnate, six to 

 eight inches long, quite glabrous throughout, moderately firm in 

 texture, green on both sides. Pinnae seven to thirteen, linear, 

 one-eighth to one-sixth of an inch broad, two to three inches long, 

 the end one like the others, all the side ones except the one to 

 three lowest pau's simjDle, the uppermost pair dilated and decurreut 

 at the base, the others sessile, narrowed to the base, the lowest 



N. s. VOL. 8. [March, 1879.] k 



