Lepanthes mucronata is a small to large, caespitose, epiphytic orchid with slender roots and slender erect ramicauls 2–23 cm long, enclosed by 7–12 closely fitting, microscopically ciliate-scabrous lepanthiform sheaths with narrowly dilated, acuminate ostia. The leaf is more or less horizontal, often purple beneath, thinly coriaceous, narrowly ovate, acute and acuminate, 1–8 cm long and 0.5–2 cm wide, with the base broadly to narrowly cuneate into a 1–2 mm petiole. The leaf tip is often prominently mucronate — the source of the species's epithet — though Luer & Thoerle note that this character occurs in varying degrees in most species of the genus.

The inflorescence is a congested, successively many-flowered raceme up to 10 mm long, borne on top of the leaf on a filiform peduncle 3–20 mm long. A short and a long peduncle frequently co-exist on the same plant — Luer notes that "a raceme borne by a short peduncle usually accompanies a second raceme with a twice longer peduncle," with both racemes commonly bearing their flowers simultaneously. Floral bracts are 1–2 mm long; pedicels 2–4 mm; ovary 1.5–2 mm. The sepals are yellow, brown, or purple, glabrous, with smooth margins. The dorsal sepal is ovate and obtuse, 3–4 mm long and 2.75–3.25 mm wide, 3-veined, connate to the lateral sepals for 0.5 mm. The lateral sepals are connate into a broadly ovate synsepal, 3–4 mm long and 3–3.75 mm wide, each 2-veined, the apex obtuse and often shortly bifid.

The petals are green, brown or purple, microscopically pubescent, transversely bilobed with a slender marginal process between the lobes, 1–1.5 mm long and 3–5 mm wide. The upper lobe is oblong and sharply truncate, with the angles shortly acuminate and sometimes erose; the lower lobe is triangular and acute. The marginal process between them — a "narrow process, or third lobe, projecting laterally from the margin between the two transverse lobes" — indicates the species's membership in a large alliance within the genus and is a key recognition character. The lip is purple or brown, bilaminate, with thin blades adherent medially over the column, elliptical with rounded ends, minutely ciliate, 1.5–2.25 mm long, borne at the base by short connectives; the body is narrow, connate to the base of the column; the sinus obtuse with a comparatively large, oblong, concave, ciliate scaphoid appendix — proportionally large relative to the rest of the lip and another defining character of the species. The column is 1.5–2.5 mm long, with dorsal anther and ventral stigma.

Flower characteristics at a glance: small (sepals 3–4 mm), brownish or greenish overall, with the diagnostic combination of a truncate-erose petal upper margin, a narrow third lobe projecting laterally between the two main lobes, and a proportionally large boat-shaped (scaphoid) appendix beneath the bilaminate lip. The inflorescences lie flat against the upper leaf surface, often within the central groove of the leaf, sometimes with two co-existing racemes on the same plant.

The morphological characters described here follow Luer & Thoerle (2012), Icones Pleurothallidinarum XXXII.

Lepanthes mucronata is an epiphyte of montane Andean forests across its broad geographic range, occurring through cloud-forest habitats from Bolivia north into Colombia. Luer & Thoerle (2012) describe the species as "one of the most common" of the Andean Lepanthes, noting marked vegetative variability across its range — small to relatively large plants, leaves varying from broadly ovate to nearly linear, no two populations alike, but the flower architecture remaining consistent enough that the species is "always readily recognized."

In La Honda, L. mucronata has been observed as an epiphyte in the forest interior at approximately 2,500 m. The species is common at the site, occurring more abundantly than the narrow-range Colombian endemics also documented in this chapter. The plants exhibit the characteristic flat-against-leaf inflorescence habit described in the published literature, with the brownish-green flowers nestled into the upper-leaf groove and frequently visible only when the leaf is examined closely from above.

Lepanthes mucronata has the broadest documented distribution of any species of the genus included in this book, occurring across Bolivia, Colombia, Ecuador, and Peru through the tropical Andes (POWO, 2026; Luer & Thoerle, 2012; IUCN, 2013). The species is common throughout this range and is reported from all three Colombian cordilleras as well as from the Ecuadorian and Peruvian Andes south to Bolivia. The protologue (Lindley, 1836) was based on Peruvian material from the early decades of South American botanical exploration, and the species has subsequently been recollected at numerous localities across the Andes during the past two centuries.

The La Honda record extends documented occurrence to the eastern slope of the Cordillera Central in Antioquia. Given the species's broad range, the La Honda observation contributes to the distributional record without representing a notable range extension — L. mucronata is among the species expected to occur in well-conserved cloud forest at this elevation across much of the tropical Andes.

Flowering has been observed in La Honda. The successive-flowering habit (multiple flowers produced in sequence per raceme, with two racemes of differing peduncle length frequently co-occurring on the same plant) means that fertile plants typically present at least one open flower throughout much of the local cycle. The available data do not yet support a precise characterisation of the local phenology; systematic observation across a full annual cycle would be required.

Recognition rests on the combination of vegetative habit and the diagnostic floral architecture, set against the species's well-documented vegetative variability. Vegetatively, the slender ramicauls 2–23 cm tall, the more or less horizontal leaf often purple beneath, and the prominently mucronate leaf tip are useful starting features — though Luer & Thoerle caution that the leaf tip's mucronate character "occurs in varying degrees in most species of the genus" and is not in itself diagnostic.

Florally, the diagnostic combination is:

• The inflorescence lying flat upon the upper surface of the leaf, commonly within the central leaf groove, often with two racemes (one short-peduncled, one twice as long) co-existing simultaneously.
• The petal upper lobe truncate, sometimes erose, with the corners narrowly pointed.
• A narrow process or third lobe projecting laterally from the petal margin between the two transverse lobes — indicating membership in a large alliance of Lepanthes species sharing this character.
• The bilaminate lip with a proportionally large, oblong, concave, ciliate scaphoid appendix.

Luer & Thoerle's framing remains apt: across the species's broad range and marked vegetative variability, "the flower is always readily recognized." A field observer encountering this combination of characters can identify L. mucronata with confidence even in populations whose vegetative habit appears unusual.

Lepanthes mucronata has been assessed as Least Concern (LC) by the IUCN Red List (Contu, 2013). The assessment, based on the species's broad geographic range across four Andean countries and apparent abundance throughout that range, concludes that the species is at low risk of extinction at the global scale. A Colombia-focused species distribution modelling study by Moreno et al. (2020) reached the same Least Concern assessment at the national scale, based on protected-area coverage and ecosystem-representativeness analyses. At the national regulatory level in Colombia, the species is not listed in Resolución 0126 de 2024 of the Ministry of Environment and is therefore not classified as threatened under current Colombian environmental law.

"Least Concern" is the IUCN's lowest-risk category for evaluated species, but does not mean that the species is exempt from local threats. Even widely-distributed cloud-forest epiphytes depend on the continuity of mature montane forest at appropriate elevations, and any specific L. mucronata population remains vulnerable to local habitat conversion, agricultural expansion, and microsite-specific pressures. The LC status reflects the species's situation at full range scale; it does not imply that any particular forest patch hosting the species is itself secure.

For these reasons — and to maintain consistency with the locality-redaction practice applied to the other Lepanthes sheets in this book — the specific location within La Honda where L. mucronata has been documented is not published, and precise elevation data beyond the approximate 2,500 m tier are redacted from this sheet. Requests for further locality detail from researchers or conservation practitioners with a legitimate scientific or institutional purpose may be directed to [email protected].