478 
PACIFIC SCIENCE, Vol. XVII, October 1963 
truncate, the inner surface pale, shining, the 
walls 0.2 mm thick, bony, brown, and the outer 
surface with sharp longitudinal ridges; seed 7-8 
mm long, 3-3.5 mm in diameter; apical meso- 
carp of white pith, without fibers except up the 
sides; basal mesocarp 2-3 mm long, fibrous up 
the sides, fleshy within. 
HOLOTYPUS: Vietnam, Bach Ma, Province de 
Thua-Thien, on forested stream bank, 1,400 m. 
alt., Jan. 26, 1961, H. St. John 26,379 ( BISH ) . 
DISCUSSION: P. bipollicaris is a member of 
the section Rykia , as is its closest relative, P. 
bicornis Ridl. of Malaya, a species which has the 
peduncle 5-10 cm long; syncarp 7-8 cm long, 
5.6 cm in diameter, bearing 100-120 drupes, 
these 28-34 mm long, 8-10 mm wide; style 2-3 
mm long; endocarp central, with a central apical 
prolongation, the lateral walls 2 mm thick; 
leaves 0.7-2 m long, at midsection with 24 sec- 
ondary veins in each half, the blade quickly 
tapering into a 5 cm subulate apex, and near the 
base the margins with prickles 2.5-4 mm long 
and 2-7 mm apart. P. bipollicaris has the pe- 
duncle 20 cm long; syncarp 11.5 cm long, 6.7 or 
more cm in diameter, bearing about 672 drupes, 
these 20-25 mm long, 5-9 mm wide; style 3-4 
mm long; endocarp in lower V3, the apex trun- 
cate, the lateral walls 0.2 mm thick; leaves 2-3 
m long, at midsection with 36 secondary veins 
on each side, very gradually tapering into a 10 
cm subulate apex, the margins near the base 
with spines 3-6 mm long, 10-20 mm apart. 
The epithet is the Latin adjective, bipollicaris, 
length of two thumbs or two inches, and is 
chosen with reference to the leaves which are 
about two inches wide. 
Pandanus magnifibrosus sp. nov. (sect. Rykia) 
Fig. 198 
DIAGNOSIS HOLOTYPI: Planta sine caule, foliis 
"3.65 m. longis,” 4.8 cm latis coriaceis ligulatis 
in sectione mediali cum 34 nervis secundariis in 
quoque latere in apice subulato longe diminuen- 
tibus et 10 cm ex apice solum 16 mm latis triner- 
vatis et in sectione M-f ormatis, in regione 
mediali marginibus cum aculeis 2-2.2 mm 
longis 8-15 mm distantibus arcuato-subulatis 
subluteis, midnervo infra cum aculeis 2-2.5 mm 
longis 9-17 mm distantibus salientibus sed api- 
cibus reflexis, proxima apicem marginibus et 
midnervo infra cum serris 0. 5-0.8 mm longis 
1-4 mm distantibus et nervulis secundariis supra 
cum serris simulantibus 3-8 mm distantibus, 
"pedunculo 0.38 m. longo, syncarpio 0.34 m. am- 
bitu,” drupis numerosissimis 27-30 mm longis 
3-4 mm latis et crassis anguste oblanceo-fusi- 
formibus 5-6-angulatis, parte 3/7 supera libera, 
pileo 12-13 mm longo arcuato lineari-lanceo- 
loideo firmo papilloso rugosoque stramineo, stylo 
5-6 mm longo subulato arcuato ad apicem vel 
ad basem syncarpii cartilagineo laevi et lucido, 
stigmate 6-7 mm longo sublineari brunneo pa- 
pilloso proximo, endocarpio in parte 2 A infera 
et 12 mm longo pallido, seminibus non evidentis 
forsan sterilibus, mesocarpio apicali et laterali 
conjunctis valde fibrosis et medullosis, mesocar- 
pio basali fibroso et carnoso. 
DIAGNOSIS OF HOLOTYPE: Stemless; leaves 
"3.65 m. long,” 4.8 cm wide, coriaceous, ligulate, 
at midsection with 34 secondary veins in each 
half, long tapering to a heavy subulate apex 
which 10 cm down is 16 mm wide; the base not 
seen; 3 -nerved and in section M-shaped; at the 
middle the margins with prickles 2-2.2 mm 
long, 8-15 mm apart, arcuate-subulate, yellow- 
ish; the nearby midrib below with prickles 2-2.5 
mm long, 9—17 mm apart, salient but the apex 
reflexed; near the apex the margins and midrib 
below with serrae 0.5-0. 8 mm long, 1-4 mm 
apart, and the secondary nerves above with simi- 
lar serrae 3-8 mm apart; "peduncle 0.38 m. long; 
syncarp 0.34 m. in circumference”; drupes very 
numerous, 27-30 mm long, 3-4 mm wide and 
thick, narrowly oblance-fusiform, 5-6-angled, 
the upper 3/7 free; pileus 12-13 mm long, ar- 
cuate linear-lanceoloid, firm papillose and ru- 
gose, stramineous; style 5-6 mm long, subulate, 
curved and often recurved, cartilaginous, smooth 
and shining; stigma 6-7 mm long, almost linear, 
brown papillose, proximal; endocarp in lower 
7 6 and 12 mm long, pale; seeds not seen, per- 
haps sterile, though apparently mature; apical 
and lateral mesocarp continuous, strongly fibrous 
and pithy; basal mesocarp fibrous and fleshy. 
HOLOTYPUS: Thailand (Siam), Kao Soi Dao, 
Patalung, evergreen forest, 300 m. alt., April 29, 
1930, A. F. G. Kerr 19,227 (bk). 
DISCUSSION : Pandanus magnifibrosus St. John 
is a member of the section Rykia. Its closest 
