Relictithismia
Genus of plants
| Relictithismia | |
|---|---|
 | |
Conservation status | |
 Critically Endangered (IUCN 3.1)[1] | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Dioscoreales |
| Family: | Burmanniaceae |
| Genus: | Relictithismia Suetsugu & Tagane[1][2] |
| Species: | R. kimotsukiensis |
| Binomial name | |
| Relictithismia kimotsukiensis Suetsugu, Yas.Nakam. & Tagane[1][2] | |
Relictithismia kimotsukiensis is a species of fairy lanterns. It is placed either in the family Thismiaceae,[1] or in the family Burmanniaceae by those who do not recognize Thismiaceae.[3] It is the only species in the genus Relictithismia. This mycoheterotrophic plant is known only from the Kimotsuki Mountains, in the Ōsumi Peninsula, Kagoshima Prefecture, Kyushu Island, in the southern Japan.[1][2] The species is assessed as Critically Endangered based on IUCN Guidelines.[1]
Description
Like related genera, Relictithismia lacks chlorophyll and feeds on fungi. The genus is distinguished from the closely related Haplothismia by its solitary flowers, having an annulus, and anther thecae largely separated, whereas in Haplothismia the 2-6 flowers are borne on pseudoracemes, without annulus, and the anther thecae are connate.[1][2] Flowering individuals, as well as individuals with immature fruits, were observed and collected in the month of June.[1]
Taxonomy
The genus and species were first described in 2024. The genus name is derived from the combination of Latin words "relictus", meaning "left behind", and the generic name "Thismia", whereas the species name "kimotsukiensis" refers to the type locality of the species, Mt. Kimotsuki.[1][2]
Distribution
This species is known only from the type locality in the Kimotsuki Mountains, in the Kagoshima Prefecture, Kyushu Island, in southern Japan.[1][2]
References
- ^ a b c d e f g h i j Suetsugu, Kenji; Nakamura, Yasunori; Nakano, Takafumi; Tagane, Shuichiro (2024-02-29). "Relictithismia kimotsukiensis, a new genus and species of Thismiaceae from southern Japan with discussions on its phylogenetic relationship". Journal of Plant Research. doi:10.1007/s10265-024-01532-5. hdl:20.500.14094/0100486392. ISSN 1618-0860. PMID 38421521.
- ^ a b c d e f Pskhun (2024-03-01). "Species New to Science: [Botany • 2024] Relictithismia kimotsukiensis (Thismiaceae) • A New Genus and Species from southern Japan with discussions on its phylogenetic relationship". Species New to Science. Retrieved 2024-03-02.
- ^ Angiosperm Phylogeny Group (2016). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV". Botanical Journal of the Linnean Society. 181 (1): 1–20. doi:10.1111/boj.12385.
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