ix, c, i Ames: Orchids of Guam 15 
PH RE ATI A Lindley 
PHREATIA (§ EUPHREATIA) THOMPSONII sp. nov. 
Caules valde abbreviati, circiter 1.5 cm alta, vaginis foliorum 
persistentibus obtegentibus. Folia 4, disticha, vaginantia, va- 
ginae longius persistentes, complanatae, laminae foliorum ple- 
rumque lineari-oblongae, saepe lineares, ad apicem inaequaliter 
bilobae, obtusae, infra medium sensim angustatae, repente sul- 
catae, in sicco chartaceae, 8 cm longae, 4-8 mm latae, rarissime 
3 cm longae, 3 mm latae in plantae exiguae. Tota planta usque 
ad 12 cm alta. Racemi laterales ex axillis inferioribus, multiflori, 
ascendentes vel ereeti, foliis multo breviores, rarissime folia 
aequantes. Pedunculi graciles usque ad 8 cm longi, paene usque 
ad basim florigeri, inter basim et bracteam floris infimi 3-brac- 
teatus, bracteis tubularibus, acuminatis, acutis. Flores albidi, 
minuti, 1-2 mm distantes in racemo cylindraceo. Bracteae in- 
florescentiae lanceolatae, abrupte acuminatae, 1-nervae, circiter 
2 mm longae pedicellis longiores, in sicco chartaceae, dependentes. 
Sepala lateralia oblique triangulari-ovata, acuta, vix 1.5 mm 
longa, vix 1 mm lata, textura membranacea, manifesto 1-nervia, 
concaviuscula, mentum brevem obtusum formantia. Sepalum 
dorsale oblongum, acutum. Petala triangulari-lanceolata, sepalis 
multo minora, 1 mm longa, vix 0.75 mm lata. Labellum con- 
caviusculum, vix unguiculatum, obovatum, ad apicem late 
retusum, manifeste 3-nervium. Discus glaber. Gynostemium 
minutissimum. 
Guam, Experiment Station 821, collected at Mukfuk, under the direction 
of J. B. Thompson, January 19, 1912, an epiphyte, growing on free trunks; 
H. L. W. Costenoble 117b, May, 1906. 
Closely related to Phreatia minutiflora Lindl., but in part distinguish- 
able from it by the different habit. The short peduncles give the plant a 
characteristic appearance. In most of the specimens examined the tip of 
the raceme hardly exceeded the middle of the leaves. A few diminutive 
plants were collected in which the raceme about equals the leaves. 
LUISIA Gaudichaud 
LUISIA TERETIFOLIA Gaudich. Bot. Freyc. Voy. (1826) 427, t. 37. 
McGregor 360, without flowers but undoubtedly this species, the type of 
which was from Guam. 
Widely distributed in Malaya and Polynesia. 
SACCOLABIUM Blume 
8ACC0LABIUM GUAMENSE sp. nov. 
Herba epiphytica, carnosa. Caules circiter 6 cm longi, rad- 
icantes. Folia conferta, coriacea, ad apicem inaequaliter biloba, 
anguste elliptica vel oblonga, 4.5- 10 cm longa, 2 cm lata, in 
