Campylocentrum serranum Pessoa & Alves (2015b: 54)

Pessoa, Edlley & Alves, Marccus, 2018, Taxonomical revision of Campylocentrum sect. Campylocentrum (Orchidaceae, Vandeae, Angraecinae) in Brazil, Phytotaxa 362 (1), pp. 1-20 : 13-14

8. Campylocentrum serranum Pessoa & Alves (2015b: 54) .

Type: — BRAZIL. Pernambuco: Jaqueira, Reserva Particular do Patrimônio Natural Frei Caneca, Mata do Quengo, 30 May 2012, E. Pessoa et al. 945 (holotype: UFP!, isotypes: K!, NY!, RB!). ( Fig. 5E–G , Fig. 6 )

Erect or pendent herbs. Roots 1.0– 1.5 mm diameter, dorso-ventrally flattened. Stem 0.3–0.7 cm long. Leaves 1.0–3.1 × 0.2–0.4 cm, elliptical, sub-falcate, lobes acute. Inflorescence 2.5–4.0 cm long, lax, peduncle 0.7–1.2 cm long, papillose; rachis 1.5–3 cm long, papillose; floral bracts 0.5–1.2 × 0.3–0.5 mm, lanceolate to deltoid, margin minutely denticulate, the apex acute. Flowers 8–15 (per inflorescence), whitish, ovary pedicellate 1.3–1.5 mm long, minutely papillose; dorsal sepal 1.2–1.5 × 0.3–0.5 mm, oblong-elliptical, 1-nerved, adaxially sparsely pilose in the base, the apex acute to obtuse; lateral sepals 1.4–1.6 × 0.4–0.5 mm, oblong-elliptical, 1-nerved, adaxially sparsely pilose in the base, the apex acute; petals 1.1–1.3 × 0.4–0.5 mm, oblong-elliptical, 1-nerved, glabrous, the apex acute; lip 1.0– 1.2 mm long, 1.0– 1.1 mm wide between the lateral lobes, 3-lobed, 5-nerved, margin entire, producing a spur at base, lateral lobes 0.2–0.3 × 0.3–0.4 mm, ovate, the apex rounded, mid-lobe 0.5–0.6 × 0.3 mm, deltoid, the apex acute, spur 1.5–1.6 mm long, 0.3–0.5 mm diameter, cylindrical, slightly curved, whitish, the apex rounded; gynostemium 0.2–0.3 mm long, anther cap apex 2-lobed. Capsules 5–6 × 1.5–2 mm, glabrous, pedicel ca. 1.0 mm long.

Distribution and Habitat:— Endemic to Northeastern Brazil (state of Pernambuco) where it is only known from the type locality, an area of submontane Atlantic forest.

Conservation status:— Due its extremely reduced and fragmented area of occupancy (criterion B1a and B2a) this species is considered Critically Endangered (CR).

Similar species:— Campylocentrum serranum is the only species of the group that occurs in the northern portion of Atlantic Forest characterized by relatively longer and lax inflorescences, flowers with 1-nerved sepals and petals, and 3-lobed lip. It is morphologically similar to C. hirtellum from which it differs by shorter sepals (<1.6 mm vs.> 2.2 mm long), 5-nerved lip (vs. 7–9-nerved) and the spur slightly longer than the pedicellate ovary (vs. twice longer), and glabrous capsules (vs. hirtellous). It also resembles C. ulaei , from which is easily distinguished by the shorter stems (up to 0.7 cm vs. 25 cm long), and spur cylindrical (vs. clavate to cylindrical-clavate). (Table 1)

Additional specimens examined:— BRAZIL. Pernambuco: Jaqueira, Reserva Particular do Patrimônio Natural Frei Caneca, Mata do Quengo , 29 Jan 2013, Pessoa et al. 1051 ( UFP) ; ibid., 25 Nov 2014, Pessoa et al. 1279 ( UFP) .

Figures

FIGURE 5. A–D. Campylocentrum micranthum. A. Habit. B. Flower. C. Dissected perianth. D. Capsule. E–H. C. serranum. E. Habit. F. Flower G. Dissected perianth. H. Capsule. [A–D. Drawn from Pessoa et al. 1217 (UFP). E–G. Drawn from Pessoa et al. 945 (UFP)].

FIGURE 6. Distribution map of Campylocentrum micranthum, (black square); C. serranum (white circle), C. steyermarkii (white triangle) and C. ulaei (black circle).