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14 The Philippine Journal of Science 1914 
Guam plant with a flower from a Philippine specimen (Lyon 110, Hb. Ames 
10854) and find that the only differences of importance are in the characters 
of the terminal lobe of the labellum. One of the marked peculiarities of 
Dendrobium scopa is the elongated, oblong, connecting plate between the 
lateral lobes and the fringed apex of the lip; this peculiarity is found in 
the Guam plants. However, the fringe of the labellum of the Guam plants 
is composed of broader, somewhat shorter, and more branched segments 
than the fringe of the Philippine plant used for comparison. The same dif- 
ference is observable between the fringe of the lip in the Guam plant and 
the fringe as figured by Lindley in the colored drawing which accompanies 
the type of Dendrobium scopa Lindl. 
DENDROBIUM (§ GRASTIDIUM) GUAMENSE sp. nov. 
Caules conferti, 60 cm alti, ad basim teretes, prope apicem 
leviter complanati. Foliorum vaginae plerumque cylindraceae, 
arte adpressae, quam internodia paulum breviores vel sublon- 
giores, 2-3 cm longae, infra medium caulem circiter 5 mm in 
diametro, in longitudinem striatae, rugosae, rigidae. Folia dis- 
ticha, oblongi-lanceolata, sensim angustata ad apicem, ad basim 
rotundata, subcoriacea, sicca multistriata, usque ad 10 cm longa, 
7- 15 mm lata, ad apicem inaequaliter bilobum, obtusum, vaginis 
persistentibus caulem obtegentibus. Racemi a caulibus foliatis 
orti, biflori, foliis multo breviores, squamis 4 conchiformibus 
chartaceis basi vestiti. Pedicellus cum ovario 6 cm longus. 
Sepala lateralia mentum obtusum 4 mm longum formantia, elon- 
gata, triangulari-lanceolata, e basi curvata, acuminata, prope 
apicem subcaudata, acuta, extus leviter carinata in medio, 12 
mm longa, prope medium 2.5 mm lata. Sepalum dorsale lineari- 
lanceolata, ad apicem incrassatum, subcaudatum, concaviuscu- 
lum, circiter 1-4 cm longum, 2 mm latum. Petala lineari- 
lanceolata, utrinque angustata, acuminata, acuta, subcaudata, 
ad basim pergracilia, circiter 12 mm longa, prope medium vix 
2 mm lata, ad basim 0.5 mm lata. Labellum unguiculatum, 
trilobatum, lobi laterales breves, trianguli, acuti, vix 1 mm lati; 
lobus medius triangulari-lanceolatus, acutus, 4 mm longus, ad 
basim 3 mm latus, irregulariter dentatus, labellum toto ambitu 
ovato-lanceolatum, 9 mm longum, usque ad 4 mm latum. Labelli 
discus in lobo medio lineis tribus papillosis; lamella satis alta, 
vix undulata, ab ungue labelli medium fere in discum decurrens. 
Stelidia gynostemii obtusa. 
Guam Experiment Station 450, July, 1912, collected under the direction 
of J. B. Thompson. 
Dendrobium guamense is closely related to D. dactylodes Reichb. f. A 
specimen preserved in the United States National Herbarium, collected by 
H. L. W. Costenoble, appears to be conspecific with D. guamense. This 
specimen is accompanied by a colored sketch which represents the flower as 
white with a yellow labellum (Costenoble 1177). 
