— 102 — 
Pteridophyta’) 
by H. Christ — Basel. 
Ferns from Siam are rather scarce in the collections, and this 
Empire, between well known Burma and pretty well explored 
Tonkin, forms a blanc, which the Danish Expedition has diminished 
in a very satisfactory manner. 
On account of the small size of Koh Ghang and its short di- 
stance from the mainland, | think we are right in supposing that 
the present fern-collection will be only a scanty extract of the flora 
of the Continent. Notwithstanding, it characterizes very well this 
region as a transitory one between the Malayan Peninsula and the 
most Eastern shores of Asia, in other terms: between the Monsoon 
flora and the Chinese flora. 
On the whole the ferns of Koh Chang belong decidedly to the 
former, but some species will clearly show the influence of the 
datter: Alsophila podophylia, known from Hongkong, 8. W. China 
and Tonkin (Pére Bon), Brainea insignis, from S. W. China (Henry). 
Tonkin (Billet) to Assam are of this number. 
As to rarities or endemic forms in an island of so small a size 
we might not expect many surprises. Nevertheless, the fern-flora of 
Koh Chang is by no means a poor one. Among the usual Malayan 
species we meet with Adiantum Bonit Chr., a native plant of Tonkin 
(Pére Bon) and closely allied to A. Levinge: Baker, Summary 27, 
of Sikkim, to A. Celebieum Chr., Ann. Buitenzorg XV, 1, of Celebes 
and to A. Hosei Bak. Journ. bot., 1888, 324, of Borneo; a subspecies 
of Gleichenia linearis Burm.: G. subpectinata n.sp., a new Tricho- 
manes Siamense, of the group of 7. rigidum Sw., the curious var. 
undulata (Wall.) of Gymnopteris costata (Wall.) rather rare in 
India, and var. Schmidtii of the common Acrostichum anreum lL. 
with very cuspidated leaves. 
1) Selayinella determined hy Professor G. Hieronymus, Berlin. 
