HISTORY OF INTRODUCTION OF EXOTIC FERNS. 27 
■podicc, including P. contiguum and P. Emcrsoni, 
which, on account of their sporangia being seated in 
a deep cyst, and protruding outwards, are referred by 
some authors to Davallia. Two fine Tree-ferns are 
also worthy of notice, Alsophila crinita and Cyathea 
Walkeri. Many of the islands of the Eastern Archi- 
pelago likewise offer a fertile field for the fern 
collector, being rich in species of Hymenophyllum, and 
Trichomanes , Asplenium, Lomaria, as well as in Tree- 
ferns of the genera Cyathea and Alsophila. The one 
or more Sumatran Ferns yielding the singular styptic 
drugs brought to this country of late years under the un- 
couth names of Penghawa, Djambi, and Pakoe Kidang, 
would be of interest to cultivators from their beauty, 
and to pharmaceutists from their properties. Cibotium 
djambianum, Dichsonia chrysotricha, and two other 
species of Alsophila ( A . lurida and tomentosa) have 
been mentioned as the sources of these drugs ; but 
very little is known respecting any of them, and 
more information is desired. Two singular and 
peculiar Ferns widely spread throughout this region 
are Tcenitis blechnoides and Osmunda Javanica , which, 
although long known in herbaria, have not yet 
found a place in our living collections. The Moluc- 
cas and Celebes, especially, possess large numbers ; 
and among those in the former is the rare Cy stadium 
sorbifolium, known only from a few imperfect spe- 
cimens from these islands, and from the island of 
Honimoe. Mauritius contains several which would be 
acceptable in our gardens ; but, with such an enthu- 
siastic explorer as Mr. Duncan in that island, it is 
to be hoped that they will not long be classed 
among our desiderata. I would particularly call atten- 
