494. 348 
41. Pteris longifolia L.; Christ, 1. c. 106 (no. 549 e). 
Hieronymus has recently (Hedwigia 54: 290—294, 1914) separated 
out from the true P. longifolia L., which is American, the Old Worlds 
forms of P. longifolia as a distinct species P. vittata L., to which the 
Koh Chang specimens consequently belong. 
42. P. biaurita L. P. quadriaurita var. biaurita Christ et var. 
Grevilleana Christ, |. c. 106 (non P. Grevilleana Wall.), — (no. 19 and 254). 
43. P. quadriaurita Retz.; Christ, lc. 106 (excl. var.). 
Hieronymus has recently (Hedwigia 55: 325—375. 1915) elaborately 
dealt with the Asiatic forms of the cosmopolitic collective species P. qua- 
driavrita. He gives very long.and detailed descriptions of no fewer than 
20 Asiatic species, the majority of them founded on a single or a couple 
of specimens. I have tried to determine the two forms collected in Koh 
Chang after the descriptions of Hieronymus. As could be expected, the 
specimens do not agree in all details with so detailed descriptions, and 
I cannot, therefore, with certainty determine the two forms. 
The first of these is possibly P. Blumeana Ag.; Hieron., 1. ¢. 360, 
with which it agrees in its obtuse, subemarginate segments. It is a form 
with a whitish band along the midrib of the pinne, a peculiarity found 
in several of the species (no. 785). 
The second form is probably identical with 
44. P. aspericaulis Wall.; Hieron. |. c. 348. P. asperula Christ, 
l.¢. 107 (non J. Sm.),— (mo. 632). Known from N. India only. 
45. P. tripartia Sw.; Christ, 1. c. 107, — (no. 578). 
46. Vittaria elongata Sw.; Christ, ]. c. 104, — (no. 76 and 729). 
47. Antrophyum reticulatum (Forst.) Kif.; Christ, l.c. 104, — (no. 745). 
48. Drymoglossum heterophyllum (L.) C. Chr. Ind. 246; D. pilosel- 
loides (L.) Pr.; Christ, 1. c. 105, — (no. 128, 179, 416, 660 a). 
49. Taenitis blechnoides Sw.; Christ, 1. c. 104, — (no. 400).' 
50. Polypodium punctatum L.; Christ, 1.’c, 105, — (no. 234, 358, 745c). 
51. P. nigrescens Bl.; Christ, 1. c. 105, —- (no. 765). 
52. P. sinuosum Wall.; Christ, 1. ¢. 105, — (no. 97). 
53. Cyelophorus adnascens (Sw.) Desv.; C. Chr. Ind. 197; Niphobolus 
adnascens KIf.; Christ, 1. c. 105, — (no. 806). 
54, @. acrostichoides (Forst.) Pr.; C. Chr. Ind. 197; Niphobolus 
acrostichoides Rich.; Christ, 1. c. 105, — (no. 476). 
