TONQUIN FERNS. 



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



Monsieur B. Balansa, so well and honourably known as a 

 collector in Asia Minor and Paraguay, has been engaged, during 

 the four years between 1885 and 1889, in exploring Tonquin. His 

 collections are very extensive, and as next to nothing has been 

 known previously about the Botany of that region, they are of great 

 interest. The general superintendence of their elaboration syste- 

 matically has been entrusted by M. Bureau to M. Drake del Castillo, 

 and papers have already appeared in the French journals on the 

 Cupuliferse, Grasses, and Mosses. In the present paper I propose 

 to enumerate all the species contained in our Kew List of the 

 Vascular Cryptogamia, and to describe the novelties. The numbers 

 given with each species are Balansa's distribution numbers, and 

 those in brackets indicate the position of the new species according 

 to our ' Synopsis Filicum.' 



1858. Cyathaa spinulosa Wall. ? 



31, 33. Alsophila podophylla Hook. 



(58*), 1803, 1861. Alsophila rheosara, n. sp. — Trunk a yard 

 high. Fronds ample, deltoid, bipinnate, moderately firm in 

 \j texture, green and glabrous on both surfaces ; rachises brown, 



without either paleas or prickles. Pinna? oblong-lanceolate, reaching 

 a length of 1^-2 ft. and a breadth of 7-8 in. Pinnules lanceolate, 

 deeply crenate, f-f in. broad, truncate at the base, the lower dis- 

 tinctly petiolated. Main veins £ in. apart ; veinlpts simple, 

 ascending, 4-5-jugate. Sori crowded, placed close to the main 

 veins in rows that fall short of the edge of the pinnules. — Allied 

 to A. glabra and A. podophylla. fe 



1909. Hymmophyllum polyanthos Sw. 



1907. H. dilatation Sw. 



(56*), 1905. Hymenophyllum oxyodon, n. sp. — Rhizome 

 very slender, wide-creeping. Stipe very short. Frond oblong, 

 bipinnatifid, glabrous, about an inch long ; main rachis winged 

 throughout ; primary segments crowded, the upper simple, erecto- 

 •\j patent, the lower compound, with, a few short crowded linear 

 secondary segments, the margin everywhere conspicuously toothed. 

 Sori several in a frond, terminal or lateral on the upper segments. 

 Valves of the indusium ovate, serrated. — Mountains at an altitude 

 of nearly 4000 ft. Allied to H. Tunbridyense and barbatum. 



172, 1899. Trichomanes parvulum Poir. 



194, 1901. T. aurieulatum Blume. 



1906, 1908. T. Pilkula Bary. 



1900. T. radicans Sw., var. 



1873. Davallia solida Sw. 



1877. D. divaricata Blume. 



119, 120, 1801. D. Hookeriana Wall. 



(50*), 118. Davallia (Microlepia) phanerophlebia, n. sp. — 



Rhizome creeping, J in. thick, clothed with minute brown hair-like 



i palea?. Stipe naked, a foot long. Frond oblong, simply pinnate, 



