subquadrate, with the lateral margin crenulate-dentate ; 
the lobules of the mid-lobe, forming an inverted V, are 
linear-oblong and obtuse. Dise with three elongated calli 
the lateral ones divergent [7]. 
tpidendrum caloglossum Schitr.,of which the type 
collected by Sodiro, is from Pichincha, Ecuador. The lip 
is illustrated (Fedde Repert. Beihefte 57 (1929) t. 86, Nr. 
336 )as having very undulate-crenulate lateral margins on 
the obliquely quadrate-dolabriform lateral lobes and divar- 
icate somewhat falcate rectangular-oblong lobules on the 
mid-lobe, their spread less than that of the lateral lobes. 
tpidendrum isthmi Schitr., of which the type collec- 
tion is Powell no. 104 from hills near Panama City, Pan- 
ama. Che type number ts a plant with large elliptic-lan- 
ceolate leaves and a branched panicle. The most notice- 
able point of variance is the laciniate-dentate lateral mar- 
gin of the lateral lobes as well as of the lobules of the mid- 
lobe of the lip. The lip is white with a greenish edge. 
KH pidendrum reflewum A. & S. The type is Valerio 
no. 61 collected at Arenal, Costa Rica. A restudy of the 
material fails to show any characters which will differen- 
tiate it from 7. paniculatum. The leaves are lanceolate 
to oblong-lanceolate and the inflorescence is arcuate, race- 
mose and shorter than the leaves (in this character sug- 
gesting E.resectum Reichb.f. ). 
Making due allowance for individual variation, it 
seems to us that all of the forms which have just been 
discussed should be considered as a single species. Other 
members of the general alliance, but possessing characters 
sufficiently diagnostic to separate them as distinct species, 
are Mpidendrum gratiosum  Reichb.t., A.capricornu 
Kriinzl., Mesubnutans A. XS. and hondurense Ames. 
In 1924, Dr. Schlechter described two species of this 
alliance from Colombia, J7.A4rnoldi and EH. subfloribun- 
dum. These are known to us only through the original 
[ 66 | 
