binomial (Ames, Hubbard and Schweinfurth: loc. cit. 
107). 
Trinipap: Cunupia, March 23, 1892, Alexander s.n. (Herb. Ames 
7451); St. Ann’s (Cascade), March 6, 1894, Hart s.n. (Herb. Trin. 
5481); St. Clair Experiment Station, April 16, 1907, Broadway s.n. 
(Herb. Ames 10205, 10206, 10207). 
Epidendrum laxum Poeppig & Endlicher Nov. 
Gen. ac Sp. 2 (1888) 2. 
Epidendrum yatapuense Barbosa- Rodrigues in Vello- 
sia 1, ed. 2 (1891) 123. 
Epidendrum macrothyrsis Lehmann & Kriinzlin in 
Engler Bot. Jahrb. 26 (1899) 472. 
An examination of the type of HMpidendrum laxum, 
which is preserved in the Vienna herbarium, shows that 
it represents the same concept which has been called /. 
yatapuense and I. macrothyrsis. There is rather appre- 
ciable variability in the size and luxuriance of the plants. 
The type is a large specimen with a long inflorescence, 
whereas the ‘Trinidad material represents small individ- 
uals. In critical characters, however, there is little vari- 
ation in the material gathered over the range of the spe- 
cies: Trinidad, Peru, Ecuador, Amazonian Brazil and 
British Guiana. 
The reduction of A’pidendrum yatapuense to synonymy 
under £7. /awum is based on a study of: 1) the original 
description of this concept and Cogniaux’s amplified de- 
scription in Martius’ Flora Brasiliensis; and 2) the orig- 
inal Barbosa-Rodrigues painting of 17. yatapuense, pre- 
served in the library of the Orchid Herbarium of Oakes 
Ames, and the drawing (based on the original painting 
in Flora Brasiliensis). There is no doubt that Mpiden- 
drum yatapuense is referable to 7. lawum. 
Trinipap: November 1, 1865, Prestoe s.n. (Herb. Trin. s.n.); 
Maraval, November 17, 1934, Sylvester s.n. (Herb. Trin. 13073). 
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