Trichoglottis najibii Yudistira &amp; Mustaqim is described here as a species new to science based on a specimencollected from eastern Kalimantan, Indonesian Borneo. The most unique characteristics of this species are thethe labellum’s lateral lobes adnate to the column and the 8–9 mm long cylindric and slightly curving spur. Adetailed description, distribution, habitat and ecology, notes, illustrations, and photographs are provided forthe new species

Idris, Abdul R.

Mustaqim, Wendy Achmmad

Yudistira, Yuda R.

English

The University of Sydney: Sydney eScholarship Journals online

© 2023 Royal Botanic Gardens and Domain Trustplantnet.rbgsyd.nsw.gov.au/Telopea • escholarship.usyd.edu.au/journals/index.php/TEL • ISSN  0312-9764 (Print) • ISSN  2200-4025 (Online)TelopeaJournal of Plant SystematicsVolume 26: 127–131 Publication date: 1 August 2023 dx.doi.org/10.7751/telopea17325A new species of Trichoglottis (Orchidaceae) from eastern Kalimantan, IndonesiaY.R. Yudistira1,2, Abdul R. Idris2,3 & W.A. Mustaqim2,4,* 1Yayasan Konservasi Biota Lahan Basah, Jalan Raya Sawo 17–19, Surabaya, Jawa Timur, Indonesia 2Tumbuhan Asli Nusantara, BTN Korpri Blok C1 No. 96, Kawatuna, Mantikulore, Palu 94233, Sulawesi Tengah, Indonesia 3Program Studi Kehutanan, Fakultas Kehutanan, Universitas Mulawarman, Gunung Kelua, Samarinda Ulu,  Kota Samarinda, Kalimantan Timur 75242, Indonesia 4Program Studi Biologi, Fakultas Teknik, Universitas Samudra, Langsa, Aceh 24416, Indonesia Author for correspondence: wendyachmmadm@gmail.comAbstractTrichoglottis najibii Yudistira & Mustaqim is described here as a species new to science based on a specimen collected from eastern Kalimantan, Indonesian Borneo. The most unique characteristics of this species are the the labellum’s lateral lobes adnate to the column and the 8–9 mm long cylindric and slightly curving spur. A detailed description, distribution, habitat and ecology, notes, illustrations, and photographs are provided for the new species.IntroductionTrichoglottis Blume is a genus of orchids with around 85 species, characterized by climbing or pendulous stem, oblong or elliptic leaves, inflorescence usually with 1 to many flowers, rarely more, flowers with the immobile labellum, with some part adnate to the column or column foot, at the junction with the column with a raised tongue, stelidia often with hairs at the apex, and four pollinia (Seidenfaden et al. 1992; Pridgeon et al. 2014). Recently, three new species from this genus were described (Schuiteman 1998, Naive & Martyr 2018, Bandara et al. 2022).A specimen of this genus not matching any known species was collected from the lowland forest in the eastern part of Borneo; an island with 34 Trichoglottis species known so far (POWO 2022). A thorough review of the literature and digital portal (Seidenfaden et al. 1992, Comber 1990, 2001, Schuiteman 1998, Wood 2000, Pelser et al. 2011-onwards, Kocyan & Schuiteman 2014, Naive & Martyr 2018, Bandara et al. 2022) as well as type specimens in various databases, i.e. JSTOR Global Plants (https://plants.jstor.org), showed that the recently collected specimen belongs to a species new to science and is described in this paper.128 Telopea 26: 127–131, 2023 Yudistira, Idris and MustaqimTaxonomic TreatmentTrichoglottis najibii Yudistira & Mustaqim, sp. nov.Type: INDONESIA, Kalimantan Timur, Berau Regency, Tabalar, Semurut, 70 m a.s.l., M. Najib 001, 25 July 2022 (holo: WAN). Epiphytic herbs. Roots terete, 50–100 mm long, 1–2.5 mm wide, covered with silver velamen, burgundy near the apex. Stem pendent, 45–65 cm long, 4–5 mm diam., covered with leaf sheath, sheath slightly rugose; internodes 20–30 mm long. Leaves many, distichous, linear, 140–170 mm long, 5–8 mm wide, coriaceous, tapering into pointed apex, margin entire, glabrous. Inflorescence of 2–5-flowered arranged in clusters, from nodes. Flowers open widely, c. 30 mm across in diam, lasting about a week, resupinate, purple to crimson. Pedicel and ovary slightly angular, c. 20 mm long, c. 1 mm diam., white with magenta ribs, pink to white. Median sepal purple with darker veins, free, elliptic, upper part slightly hoody, c. 13 mm long, 3–5.5 mm wide, apex rounded, margins entire, glabrous. Lateral sepals entirely purple with darker veins, obliquely ovate, c. 14 mm long, 8 mm wide, apex acute, margins entire, glabrous. Petals free, entirely purple with darker veins, spatulate, c. 12 mm long, 6 mm wide, slightly smaller than sepals, margin entire, apex rounded, glabrous. Labellum trilobed, narrowly elliptic (not flattened), c. 4.5 mm long; lateral lobes with an oblique base, raised apically into a long, truncate lobes, margin entire, adnate to column to near apex, front margin c. 1.5 mm tall; midlobe narrowly lanceolate, c. 9 mm long, 1 mm wide, upper surface pubescent with short white hairs, apex acute, sub-acuminate, white to pink; spur pure white, slightly curving, cylindrical, narrowing towards the apex, 8–9 mm long, with two longitudinal purple band at the base, glabrous. Column oblong, 9–10 mm long, 2–3.5 mm wide, truncate; stigma obpentagonal, stelidia broadly triangular, glabrous; column foot short, 1.5 mm long. Anther cap obcordate, c. 2 mm long, 2 mm wide, brown. Pollinia waxy, subglobose to ovoid, entire, c. 1 m long, 1 mm wide, solid, red-burgundy, stipe rudimentary, viscidium distinct; rostellum bifid, c. 1.5 mm long, 1 mm wide, with a median tooth, the two main teeth sometimes strongly reflexed and fitting into two cavities on viscidium. Capsule green with burgundy dots, ellipsoid, triangular in cross section, 60–75 mm long, 4–10 mm wide, slightly warty, with 3 prominent longitudinal ridges. Figures 1, 2.Diagnosis: This species is unique among Trichoglottis in having the upper side of labellum lateral lobes adnate to the column for almost their entire length and cylindrical, slightly curving spur 8–9 mm long.Distribution: Endemic to East Kalimantan: known only from the type location. Habitat and Ecology: Lowland mixed forest, hilly area north of Sangkulirang Mangkalihat range, at elevation c. 70 m a.s.l.Phenology: Flowering from June to August.Etymology: This new species is named after Muhammad Najib, an orchid enthusiast from East Kalimantan, Indonesia who collected the only known specimen.Notes: The flower of Trichoglottis najibii is similar in color to T. latisepala Ames, a species endemic from the Philippines (Ames 1909; Pelser et al. 2011 onwards). However, in T. najibii flowers are larger (c. 22 mm vs 9–10 mm long) with the colouration of the upper half intense purple vs lighter purple, and the lower half pure white with longer spur (8–9 mm vs 3.5 mm long). In addition, the lower side of lateral sepals of T. latisepala form basal lobes.In Borneo, the linear leaf lamina of this species is very similar to the Sarawak endemic T. borneensis (J.J.Wood) Kocyan & Schuit., and in the vegetative stage, it seems plants from both species cannot be differentiated. However, T. borneensis can be easily recognized by its pale lemon-yellow flowers, labellum creamy white hairs, and saccate spur with villous interior walls.AcknowledgementsAuthors thanked M. Najib for providing the collections and several supporting information used in this study. Bina S. Sitepu is also thanked for facilitating the specimen deposition in the WAN herbarium, and Yuanito Eliazar for his beautiful botanical illustration.A new species of Trichoglottis (Orchidaceae) from eastern Kalimantan Telopea 26: 127–131, 2023 129Fig. 1. Trichoglottis najibii Yudistira & Mustaqim. A: plant. B: inflorescences. C: flower, frontal view. D: flower, lateral view. E: dorsal sepal. F: lateral sepal. G: petal. H: labellum flattened shaped on top view. I: labellum natural shaped top view. J: column, ventral view. K: column, lateral view. L: anther cap abaxial side. M: anther cap, adaxial side. N: pollinia. Illustrated by Yuanito Eliazar (Voucher: M. Najib 001).130 Telopea 26: 127–131, 2023 Yudistira, Idris and MustaqimFig. 2. Trichoglottis najibii Yudistira & Mustaqim. A: inflorescences. B: flower frontal view. C: median sepal abaxial and adaxial side. D: petals abaxial and adaxial side. E: lateral sepal abaxial and adaxial side. F: ovary, column, and labellum lateral view. G: column and labellum ventral view. H: column and labellum lateral view. I: labellum on halved. J: column and ovary. K: column abaxial side. L: anther cap adaxial and abaxial side. M: pollinia. Photographs by Yuda R. Yudistira (Voucher: M. Najib 001).A new species of Trichoglottis (Orchidaceae) from eastern Kalimantan Telopea 26: 127–131, 2023 131ReferencesAmes O (1909) Notes on Philippine orchids with descriptions of new species II. Philippine Journal of Science 4: 663–676.Bandara C, Atthanagoda AG, Bandara NL, Ranasinghe B, Kumar P (2022) Trichoglottis longifolia (Orchidaceae: Epidendroideae: Vandeae: Aeridinae), a new species from Sri Lanka. Phytotaxa 567: 71–78. https://doi.org/10.11646/phytotaxa.567.1.6 Beentje H (2016) The Kew Plant Glossary: an illustrated dictionary of plant terms. 2nd ed. (Royal Botanic Gardens, Kew)Comber J (1990) Orchids of Java. (Royal Botanic Gardens & Bentham Moxon Trust, Kew)Comber J (2001) Orchids of Sumatra. (Natural History Publications (Borneo), Kota Kinabalu)Kocyan A, Schuiteman A (2013) New combinations in Aeridinae (Orchidaceae). Phytotaxa 161: 61–85. https://doi.org/10.11646/phytotaxa.161.1.3 Naïve MAK, Martyr MC (2018) Trichoglottis corazoniae (Orchidaceae: Vandeae: Aeridinae), a new species from the Philippines. Lankesteriana 18: 81–84. http://dx.doi.org/10.15517/lank.v18i2.33322 Pelser PB, Barcelona JF, Nickrent DL (eds) (2011 onwards) Co’s Digital Flora of the Philippines. http://www.philippineplants.org (accessed 4 December 2022).Pridgeon AM, Cribb PJ, Chase MW, Rasmussen FN (2014) Genera Orchidacearum. Vol. 6. (Oxford University Press, Oxford)Schuiteman A (1998) New species of Podochilus and Trichoglottis (Orchidaceae) from Borneo. Blumea 43: 489–494. https://repository.naturalis.nl/pub/525094/BLUM1998043002013.pdf Seidenfaden G, Wood JJ, Holttum RE (1992) The Orchids of Peninsular Malaysia and Singapore. (Olsen & Olsen, Fredensborg)Wood JJ (2000) Orchids of Borneo Volume 4: Revised classification and selection of species. (The Sabah Society, Kota Kinabalu & Royal Botanic Gardens, Kew)Submitted 13 April 2023; accepted 26 June 2023

A new species of Trichoglottis (Orchidaceae) from eastern Kalimantan, Indonesia

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A new species of Trichoglottis (Orchidaceae) from eastern Kalimantan, Indonesia

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