Epidendrum dichotomum
Encyclopedia
Epidendrum dichotomum C.Presl (1827) is a member of the E. secundum
Epidendrum secundum
Epidendrum secundum, one of the crucifix orchids, is a poorly understood reed stemmed species, which Dressler describes as "the Epidendrum secundum complex." According to Dressler, there are dozens of varieties, some of which appear to deserve species rank...

 group which can grow terrestrially, on rocks, and in trees. Kew accepts it as a separate species without any synonyms., as did H. G. Reichenbach (1861). In Schweinfurth (1960), E. dichotomum is the accepted name of a species distinct from E. secundum
Epidendrum secundum
Epidendrum secundum, one of the crucifix orchids, is a poorly understood reed stemmed species, which Dressler describes as "the Epidendrum secundum complex." According to Dressler, there are dozens of varieties, some of which appear to deserve species rank...

, but with several listed synonyms: E. brachyphyllum, E. lindenii, E. cuzcoense, E. tarmense, and E. inconstans. In Schweinfurth (1970), E. dichotomum is reduced to synonymy under E. secundum
Epidendrum secundum
Epidendrum secundum, one of the crucifix orchids, is a poorly understood reed stemmed species, which Dressler describes as "the Epidendrum secundum complex." According to Dressler, there are dozens of varieties, some of which appear to deserve species rank...

.

Description

E. dichotomum is quite similar to E. secundum
Epidendrum secundum
Epidendrum secundum, one of the crucifix orchids, is a poorly understood reed stemmed species, which Dressler describes as "the Epidendrum secundum complex." According to Dressler, there are dozens of varieties, some of which appear to deserve species rank...

. According to H. G. Reichenbach (1861), it is distinguished by a small lip
Labellum
Labellum is the Latin diminutive of labium, meaning lip. These are anatomical terms used descriptively in biology, for example in Entomology and botany.-Botany:...

, an entire clinandrium, and an unlobed tubercle with a pair of smaller calli near its base. According to Schweinfurth (1960), the tubercle (described as a callus) has three to five lobes with two additional lobes extending into each lateral lobe of the lip. The original description makes no mention of the tubercle, but simply compares E. dichotomum to both E. fimbriato and E. ibaguense
Epidendrum ibaguense
Epidendrum ibaguense is a species of epiphytic orchid of the genus Epidendrum which occurs in Trinidad, French Guyana, Venezuela, Colombia and Northern Brazil.There is a good article on this species in the Português Wikipedia...

, and notes that it differs sufficiently from both of them.

Homonymy

The homonym Epidendrum dichotomum Lindl. (1838), nom. illeg. is a synonym for the different species, Epidendrum jamaicense Lindl. (1853)
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