NEW OR NOTEWORTHY ORCHIDS 
ersed throughout by a pair of keels which enclose a median 
groove or channel. Column arcuate, 2 mm. long at the back, 
winged, the wing 3-toothed at the summit and the middle 
tooth bidentate, the lateral membranaceous wings adnate 
to the short broad foot. 
Pleurothallis fractiflexa is allied to P. casualis Ames, but 
it differs from that species in its relatively long inflores¬ 
cences, longer narrower lateral sepals and petals and dis¬ 
similar lip. Vegetatively it recalls P. quinqueseta Ames. 
The specific name refers to the fractiflex rachis of the 
raceme. 
The description was drawn from dried plants. 
Costa Rica, Province of Heredia, Yerba Buena, North¬ 
east of San Isidro, Paul C. Standley & Juvenal Valerio 
49902, February 22, 28, 1926. About 2000 meters altitude. 
“On tree; flowers dark purple-red.” (Type in Herb. Ames 
No. 33373); Standley & Valerio 49910. 
Pleurothallis fulgens Reichb.f. in Card. Chron. (1875) 
2:516. P. Brenesii Schltr. in Fedde Repert. Beihefte 19 
(1923) 182. 
After careful investigation, we are convinced that P. 
Brenesii and P. fulgens constitute a single species. The type 
specimen of P. Brenesii does not differ in any substantial 
character from P. fulgens as represented in Reichenbach’s 
herbarium. 
Pleurothallis guanacastensis A. & S. sp. nov. Herba 
caespitosa. Caules approximati, perbreves, monophylli. 
Folium spathulatum vel oblanceolatum, ad basim sensim an- 
gustatum. Scapi perbreves, filiformes, in apice uniflori vel 
pauciflori. Sepala lateralia falcato-lanceolata, acuta, ad 
basim connata. Sepalum dorsale oblongo-lanceolatum. Pe- 
tala obliquissime pandurata. Labellum oblongum, prope 
medium utrinque leviter dilatatum, apice late rotundato. 
Plant caespitose, 4 to about 9.5 cm. high. Roots fi¬ 
brous, flexuous, numerous, glabrous. Stems very short, up 
to 13 mm. long (rarely longer), monophyllous, entirely con¬ 
cealed by 2 loose tubular imbricating sheaths which waste 
27 
