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| Thismia sumatrana Suetsugu & Tsukaya
in Suetsugu, Tsukaya, Nurainas & Okada, 2018.
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Abstract
A new species of the mycoheterotrophic genus Thismia Griff. (Thismiaceae), Thismia sumatrana Suetsugu & Tsukaya, from West Sumatra, Indonesia, is described, based on a rehydrated herbarium specimen from National Museum of Nature and Science, Japan. Thismia sumatrana is closely related to T. clavigera (Becc.) F.Muell. but is distinguished by a much larger flower.
Keywords: Thismia, taxonomy, new species, mycoheterotrophy, Sumatra
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| Figure 1. Thismia sumatrana from West Sumatra, Indonesia (from the holotype). A Flower B Dome-shaped mitre bearing the eaves-like to hood-like accessory lobes. The accessory lobes are indicated using the arrows C Upper part of perianth tube. Outer perianth lobes are indicated by arrows D Inner view of two pendulous stamens. Thecae and glands are indicated by upper and lower arrows, respectively E Outer view of a pendulous stamen. Thecae and glands are indicated by upper and lower arrows, respectively. One grid is equal to 1 mm2. |
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Figure 2. Thismia sumatrana from West Sumatra, Indonesia (Drawn from the holotype).
A Flowering plant B Flower C Inner view of two pendulous stamens D Outer view of two pendulous stamens E Ovary with style and stigmas.
Drawn by Kumi Hamasaki. Scale bars: 1 cm (A–B), 1 mm (C–E).
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Thismia sumatrana Suetsugu & Tsukaya, sp. nov.
Diagnosis: Thismia sumatrana differs from its close relative T. clavigera, in having a much larger flower (ca. 8 cm vs. ca. 2.8 cm long).
Distribution: It is known from only a single collection comprising of one flowering and one fruiting individual.
Thismia sumatrana was collected from a forest floor beside a rheophytic zone along Anak Air Ganggu (Ganggu Stream), 0°33'S, 100°21'E, at Sipisang Village, Padang Pariaman, West Sumatra, Indonesia. The area was covered by mixed primary and secondary forest along a stream, where relatively natural conditions remained. For example, there were many individuals of a rare and large herbaceous plant, Amorphophallus titanum (Becc.) Becc. (Araceae). In addition, many individuals of a rheophytic plant, Furtadoa sumatrensis M.Hotta (Araceae), grew on small rocks both in the stream and on the stream bank (Mori and Okada 2001).
Kenji Suetsugu, Hirokazu Tsukaya, Nurainas Nurainas and Hiroshi Okada. 2018. Thismia sumatrana (Thismiaceae), A New Species from West Sumatra, Indonesia, with Discussions on the Taxonomic Identity of Thismia clavigera. PhytoKeys. 113: 59-67. DOI: 10.3897/phytokeys.113.29103
