NEW OR NOTEWORTHY ORCHIDS 
acuminate, commonly surpassing the ovary but shorter than 
the flowers, somewhat pubescent on the outer surface near 
the base. Flowers very small. Sepals sparsely pubescent 
without. Lateral sepals triangular-lanceolate, 4-5 mm. long, 
about 2 mm. wide near the base, oblique, gradually nar¬ 
rowed to an obtuse cucullate tip, basal half strongly concave- 
saccate, 1-nerved. Dorsal sepal lanceolate, 3.8-4.9 mm. 
long, about 2 mm. wide near the base, subacute or obtuse, 
1-nerved, somewhat concave. Petals strongly adherent to 
the dorsal sepal and somewhat surpassing it, very obliquely 
rhombic-lanceolate, inwardly falcate, 4-5 mm. long, 2-2.5 
mm. wide below the middle, 1-nerved, anterior margins 
erose-crenulate, basal margins abruptly cuneate-narrowed 
and entire. Labellum strongly saccate at base with sides 
adherent to the column up to the clinandrium, 4-5.2 mm. 
long in natural position, gently recurved, lanceolate-tri¬ 
angular when expanded, acuminate, margins denticulate- 
erose, 3-nerved, the saccate base provided on the inner 
surface with several small digitiform tubercles. Column 
minute. Anther cordate-ovoid, apiculate, 2-celled. Ovary 
subsessile, spreading, densely pubescent, about 6 mm. long, 
enlarging in anthesis. 
The description was made from dried specimens. 
Epipactis erosa differs from all its Central American 
allies in its triangular-lanceolate acuminate lip of which the 
margins as well as the margins of the upper part of the petals 
are minutely erose-crenulate or denticulate. 
Costa Rica, Bosque de C. Laguna, A. M. Brenes {100) 
430, November 10, 1922. 1180 meters altitude. Terrestrial. 
(Type in Herb. Ames No. 31113): Bosque en La Palma, 
Brenes {34) 364, October 30, 1922. 1190 meters altitude. 
Pterichis costaricensis A. & S. sp. nov. Herba ter- 
restris, paludicola, gracilis. Radices fasciculatae, tuberosae. 
Folia basalia, lineari-lanceolata, longe petiolata. Caulis 
glanduloso-pubescens, vaginis remotis tubularibus ornatus. 
Racemus laxe pauciflorus, floribus erectis. Sepala lateralia 
oblique ovata, acuminata, concava. Sepalum dorsale lan- 
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