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Hymenophyllaceae. 
Trichomanes. 
1. T. Javanicum Blume Enum. PI. Jav. Fil. 294. 
Plentiful on riverbanks in the jungle near Klong Munsé. 
Area: A rather common terrestrial species throughout Malaya from Assam 
to Polynesia; also in Madagascar. 
2. T. rigidum Sw. 
Our plant is very typical, with very thin segments. 
Riverbanks in the jungle by Klong Munsé and Klong Majum (700 ft.). 
Area: A common terrestrial fern of tropical forests in Asia, Africa and 
America, also in Japan, N. Zealand and the Cape Colony. 
3. T. Siamense Christ n. sp. 
Differt a JT. rigido fronde non deltoidea, sed lanceolato-ovata, 
pinnis pinnulisque abbreviatis, pinnulis remotis, irregulariter et bre- 
viter lobatis 2'/s mill. latis, lobis vix 1 mill. longis obscure denticulatis, 
dentibus brevissimis subaristatis. Lamina crispata, textura coriacea, 
*colore nigro. Urceolis paucis, liberis nec immersis, minimis, anguste 
cylindricis, margine angustissimo patente, receptaculo exserto. 
Stipitibus fasciculatis rigidis flexuosis, 6 cent. longis, lamina vix 
1 dec. longa, 4 cent. lata. 
A subspecies of T. rigidum, but habit very different, like Hymeno- 
phyllum australe Spreng. (H. Javanicum B1.). 
Riverbanks in the jungle near Klong Munsé (200 ft.). 
4. T. pyxidiferum L. 
Besides typical specimens a very small form is met with. 
Klong Sarlakpet, on damp rocks in the jungle near a waterfall (400 feet), 
Klong Majum, epiphytic (500 ft.). 
Area: A common epiphytic fern among mosses in all tropical countries. 
5. T. Filicula Bory. Van Den Bosch Tab. 26, 27, 28. 
Jungle near Klong Son epiphytic on low trees, Klong Sarlakpet on rocks. 
Area: Widely spread throughout the tropics of both hemispheres and fur- 
ther in S. Africa and Japan. Epiphytic among mosses. 
6. T. nanum Van Den Bosch 2 Suppl. 122 sub Crepidomunes. 
T. Kurzii Beddome Handb. 40, Fig. 2. 
Jungle. Klong Munsé, on stones in a riverbed. 
Area: This very minute species is indicated from S. W. India and the 
Andamans, Assam and Tonkin (Pére Bon), but surely passed over in many 
other regions. 
