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Microsaccus

Genus of orchids From Wikipedia, the free encyclopedia

Microsaccus
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Microsaccus is a genus of flowering plants from the orchid family, Orchidaceae. It is native to Southeast Asia.[1]

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Description

Vegetative characteristics

These miniature epiphytes produce laterally flattened, distichously arranged leaves on thin stems.[2][3]

Generative characteristics

The usually two-flowered inflorescences are short.[3] The spurred, minuscule flowers have a simple labellum.[2] The flowers have four pollinia.[4] Within the fruits there are pale brown to whitish trichomes with an oblong-elliptic basal zone. They have perforations in the basal region.[5]

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Etymology

The generic name Microsaccus is composed of the Greek words μικρός (mikrós) meaning small and saccus meaning sack, which refers to the labellum.[6]

Ecology

Microsaccus truncatus is known to grow epiphytically in montane forest at 1200 m above sea level.[6] Microsaccus griffithii occurs in forests at elevations of 500–2770 m above sea level.[7]

Physiology

Microsaccus uses CAM photosynthesis.[7]

Taxonomy

Species

The genus contains 13 accepted species:[1]

  1. Microsaccus affinis J.J.Sm. - Java
  2. Microsaccus albovirescens J.J.Sm. - Sumatra
  3. Microsaccus ampullaceus J.J.Sm. - Sumatra, Borneo, Malaysia
  4. Microsaccus borneensis J.J.Sm. - Borneo
  5. Microsaccus canaliculatus J.J.Sm. - Sumatra
  6. Microsaccus dempoensis J.J.Sm. - Sumatra
  7. Microsaccus griffithii (C.S.P.Parish & Rchb.f.) Seidenf. - Cambodia, Myanmar, Thailand, Vietnam, Borneo, Malaysia, Java, Sumatra, Philippines
  8. Microsaccus javensis Blume - Malaysia, Java
  9. Microsaccus mihoae P.O'Byrne & Gokusing - Borneo
  10. Microsaccus ramosus J.J.Sm. - Java
  11. Microsaccus sumatranus J.J.Sm. - Malaysia, Sumatra
  12. Microsaccus truncatus Carr - Malaysia
  13. Microsaccus wenzelii Ames - Philippines
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Phylogeny

It is closely related to the genus Jejewoodia .[8] One species, namely Jejewoodia longicalcarata (Ames & C.Schweinf.) J.J.Wood used to be Microsaccus longicalcaratus Ames & C.Schweinf.[9] It has been suggested to reunite these two genera, due to their similar appearance. Another closely related genus is Adenocos, which does not have a spur, unlike the former two genera.[8]

Horticulture

Microsaccus can be cultivated under moist conditions with a lot of air movement, and intermediate temperatures. The plants should be placed in a semi-shaded position. It is rarely cultivated.[6]

See also

References

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