|Thismia aurantiaca Hareesh & M.Sabu|
in Hareesh, Alappatt & Sabu, 2018
Thismia is a mycoheterotrophic genus in the family Thismiaceae. We report a new family record for Andaman and Nicobar Islands and a new species for India. A detailed description along with conservation assessment, colour photos, distribution map, and key to the species from India are provided.
Keywords: Andaman Islands; Rodwaya; Thismia; Thismiaceae; new record; new species
Thismia aurantiaca Hareesh & M.Sabu, sp. nov.
This species is similar to T. rodwayi but differs from the latter in having outer perianth lobes 5 times larger than inner perianth lobes (vs sub-equal), broadly triangular recurved outer perianth lobes (vs spathulate, up-curved) and inner perianth lobes with minute 0.5 mm long, erect mitre (vs well developed more than 1 mm long, bent and inter locking mitre).
Type: M. Sabu & V.S. Hareesh 152774 (holo CALI; iso CAL, PBL), India, Andaman Islands, South Andaman, Mount Harriet National Park, elevation ± 320 m, 7 Aug. 2017.
Etymology. The name ‘aurantiaca’ denotes the orange coloured flower of the plant.
|Fig. 1 Thismia aurantiaca Hareesh & M.Sabu.|
a–b. Plant in habitat; c–e. habit (M. Sabu & V.S. Hareesh 152774).
— Scale bar = 2 cm.
— Photos by M. Sabu & V.S. Hareesh.
Habitat & Ecology — So far, we could observe three populations with around 18 individuals each in the evergreen forest patches of Mount Harriet National Park, South Andaman. The plants are growing in a damp habitat in the understory of evergreen forest in association with Amomum andamanicum V.P.Thomas, Dan & M.Sabu (Zingiberaceae), Dipterocarpus sp. and Hopea sp. (Dipterocarpaceae), Phrynium sp. (Marantaceae), Malaxis sp. (Orchidaceae).
V.S. Hareesh, J.P. Alappatt and M. Sabu. 2018. Thismia aurantiaca sp. nov. (section Rodwaya, Thismiaceae): First Record of the Family from Andaman and Nicobar Islands, India with A New Species. Blumea - Biodiversity, Evolution and Biogeography of Plants. DOI: 10.3767/blumea.2018.63.02.08