Taxon Details: Miconia atlantica Caddah & R.Goldenb.
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Narratives:
Family:
Melastomataceae (Magnoliophyta)
Melastomataceae (Magnoliophyta)
Scientific Name:
Miconia atlantica Caddah & R.Goldenb.
Miconia atlantica Caddah & R.Goldenb.
Primary Citation:
Brittonia 65: 352 (351-356, figs. 1 & 2). 2013
Brittonia 65: 352 (351-356, figs. 1 & 2). 2013
Accepted Name:
This name is currently accepted.
This name is currently accepted.
Description:
Description Author and Date: Mayara Krasinski Caddah and Renato Goldenberg, based on, Miconia atlantica, a new species of Melastomataceae from the eastern mountains of Brazil. Brittonia 2013.
Type: Brazil. São Paulo, São Luiz do Paraitinga, 23°11'46?S , 45°02'44?W, 956m, 20 Nov 2011 (fl, fr), M. K. Caddah, L. S. Pereira&G. Lunhani 901 (holotype: UPCB; isotypes: RB, UEC).
Description: Trees up to 10 m high; young branches flattened, with small interpetiolar ridges, moderate to densely covered by flattened, sessile, stellate trichomes. Leaves opposite, often slightly anisophyllous, concolorous; petioles 1.5–6 cm, slightly flattened; blades 9.5–29.5× 4.5–11.5 cm, elliptic, apex acuminate, base acute to slightly ecurrent, margin entire to slightly repand, membranaceous, longitudinal nerves 3, sometimes with an additional faint, marginal pair, supra-basal, sometimes joined at the base by a membrane, main and transversal nerves slightly prominent on abaxial surface, adaxial surface glabrous, abaxial surface with sparse to moderate canescent indument consisting of flattened, sessile, stellate trichomes of about 0.05 mm diam. with white arms and brownish center, depauperate on mature leaves possibly because of the loss of some arms or parts of them. Panicles 7.5–15×7–14 cm, glomerulate, terminal, occasionally with accessory branches, densely covered by flattened, sessile, stellate trichomes 0.1 mm diam.; bracts up to 1.4 mm long, triangular, early caducous; bracteoles up to 1 mm long, triangular to linear, lately caducous. Flowers 5-merous. Hypanthium 1.8–2 mm long, campanulate, inner surface glabrous, outer moderately to densely covered with flattened, sessile, stellate trichomes of ca. 0.1 mm diam., resembling small scales when in fruit; torus glabrous. Calyx caducous in fruit, inner surface glabrous, outer with trichomes similar to the ones on the hypanthium; tube 0.2–0.5 mmlong, inner lobes 0.1 mm long, triangular, outer teeth 0.2–0.3 mm long, subulate. Petals 2.4–2.5×1–1.2 mm, white, oblong to somewhat obovate, apex emarginate and asymmetric, with a longer projection at the right side (in ventral view), margins entire, surfaces minutely papillose, reflexed at anthesis. Stamens white, isomorphic to slightly dimorphic; filaments 2.5–3.1 mm long, glabrous; connectives not prolonged or up to 0.2 mm below the thecae, nappendaged; anthers 1.7–2.5 mm long, oblong, with a single terminal, moderate pore ca. 0.3 mm. Ovary 0.7–1 mm long, half adherent to the hypanthium, 3-locular, apex glabrous to moderately covered by stellate trichomes; style 4.6–5.2mm long, straight to slightly curved, punctiform, glabrous. Fruits baccate, 3.7–4.8 mm diam., purple to black; seeds ca. 2–2.8 mm diam, semi-spherical, testa smooth, cells with anticlinal walls undulate.
Habitat and Distribution: Miconia atlantica is known from elevations from 500 to 1000 m in the Atlantic Forest range. It has been extensively collected in the mountains range of the states of São Paulo and Espírito Santo, and also in Rio de Janeiro.
Phenology: This species was collected with flowers in November and fruits from October to June.
Etymology: The specific epithet is a geographic reference to the habitat of the species.
Taxonomy and Systematics: Due to its linear anthers with truncate apices and unappendaged connectives, Miconia atlantica should be included in Miconia sect. Glossocentrum, as proposed by Cogniaux (1891). Inside this section, M. atlantica is morphologically similar toMiconia budlejoides Triana, which can be distinguished from the new species by the dense indument covering the abaxial surface of the leaves (Fig. 3), the inflorescence and the hypanthium. This indument is composed of sessile-stellate trichomes with well-defined arms. Miconia brasiliensis Triana could be confused with M. atlantica because both species have brownish colored leaves (when dry) moderately covered with stellate trichomes on the abaxial surface. However, Miconia brasiliensis has dichasial, non-glomerulate inflorescences, smaller leaves (4.5–12×1.6–4 cm; Goldenberg, 2009), and denser indumentum on the abaxial leaf surface, with wider trichomes that have well-defined arms. Miconia discolor DC. has similar leaves, which are supra-basal, with the abaxial surface of the leaves moderately covered by stellate trichomes. However, in this species, the arms of the trichomes on the leaves are well defined in mature leaves, the base of the leaves is strongly decurrent, the inflorescence is narrower, the hypanthium is densely covered with stellate trichomes, and the connectives of the anthers are usually ventrally biappendaged. Miconia atlantica has been misunderstood as a "glabrescent form" of M. budlejoides (e.g., Goldenberg & Reginato, 2006, and on specimens from several herbaria) and was reported as Miconia sp.1 in the Flora of the state of São Paulo (Goldenberg, 2009). The specimens of M. atlantica collected in São Paulo have marsupiform domatia (i.e., with membranes joining the bases of the main veins) on the abaxial surface of the leaves. None of the other above-mentioned species has such a membrane. The occurrence of domatia is usually associated with a mutualistic relationship between plants and arthropods. It has been suggested that the anatomy and morphology of the domatia is governed by environment factors but it is expected that their occurrence is genetically determined (Carvalho et al., 2012). There is quite a number of Miconia species with these mite
Description Author and Date: Mayara Krasinski Caddah and Renato Goldenberg, based on, Miconia atlantica, a new species of Melastomataceae from the eastern mountains of Brazil. Brittonia 2013.
Type: Brazil. São Paulo, São Luiz do Paraitinga, 23°11'46?S , 45°02'44?W, 956m, 20 Nov 2011 (fl, fr), M. K. Caddah, L. S. Pereira&G. Lunhani 901 (holotype: UPCB; isotypes: RB, UEC).
Description: Trees up to 10 m high; young branches flattened, with small interpetiolar ridges, moderate to densely covered by flattened, sessile, stellate trichomes. Leaves opposite, often slightly anisophyllous, concolorous; petioles 1.5–6 cm, slightly flattened; blades 9.5–29.5× 4.5–11.5 cm, elliptic, apex acuminate, base acute to slightly ecurrent, margin entire to slightly repand, membranaceous, longitudinal nerves 3, sometimes with an additional faint, marginal pair, supra-basal, sometimes joined at the base by a membrane, main and transversal nerves slightly prominent on abaxial surface, adaxial surface glabrous, abaxial surface with sparse to moderate canescent indument consisting of flattened, sessile, stellate trichomes of about 0.05 mm diam. with white arms and brownish center, depauperate on mature leaves possibly because of the loss of some arms or parts of them. Panicles 7.5–15×7–14 cm, glomerulate, terminal, occasionally with accessory branches, densely covered by flattened, sessile, stellate trichomes 0.1 mm diam.; bracts up to 1.4 mm long, triangular, early caducous; bracteoles up to 1 mm long, triangular to linear, lately caducous. Flowers 5-merous. Hypanthium 1.8–2 mm long, campanulate, inner surface glabrous, outer moderately to densely covered with flattened, sessile, stellate trichomes of ca. 0.1 mm diam., resembling small scales when in fruit; torus glabrous. Calyx caducous in fruit, inner surface glabrous, outer with trichomes similar to the ones on the hypanthium; tube 0.2–0.5 mmlong, inner lobes 0.1 mm long, triangular, outer teeth 0.2–0.3 mm long, subulate. Petals 2.4–2.5×1–1.2 mm, white, oblong to somewhat obovate, apex emarginate and asymmetric, with a longer projection at the right side (in ventral view), margins entire, surfaces minutely papillose, reflexed at anthesis. Stamens white, isomorphic to slightly dimorphic; filaments 2.5–3.1 mm long, glabrous; connectives not prolonged or up to 0.2 mm below the thecae, nappendaged; anthers 1.7–2.5 mm long, oblong, with a single terminal, moderate pore ca. 0.3 mm. Ovary 0.7–1 mm long, half adherent to the hypanthium, 3-locular, apex glabrous to moderately covered by stellate trichomes; style 4.6–5.2mm long, straight to slightly curved, punctiform, glabrous. Fruits baccate, 3.7–4.8 mm diam., purple to black; seeds ca. 2–2.8 mm diam, semi-spherical, testa smooth, cells with anticlinal walls undulate.
Habitat and Distribution: Miconia atlantica is known from elevations from 500 to 1000 m in the Atlantic Forest range. It has been extensively collected in the mountains range of the states of São Paulo and Espírito Santo, and also in Rio de Janeiro.
Phenology: This species was collected with flowers in November and fruits from October to June.
Etymology: The specific epithet is a geographic reference to the habitat of the species.
Taxonomy and Systematics: Due to its linear anthers with truncate apices and unappendaged connectives, Miconia atlantica should be included in Miconia sect. Glossocentrum, as proposed by Cogniaux (1891). Inside this section, M. atlantica is morphologically similar toMiconia budlejoides Triana, which can be distinguished from the new species by the dense indument covering the abaxial surface of the leaves (Fig. 3), the inflorescence and the hypanthium. This indument is composed of sessile-stellate trichomes with well-defined arms. Miconia brasiliensis Triana could be confused with M. atlantica because both species have brownish colored leaves (when dry) moderately covered with stellate trichomes on the abaxial surface. However, Miconia brasiliensis has dichasial, non-glomerulate inflorescences, smaller leaves (4.5–12×1.6–4 cm; Goldenberg, 2009), and denser indumentum on the abaxial leaf surface, with wider trichomes that have well-defined arms. Miconia discolor DC. has similar leaves, which are supra-basal, with the abaxial surface of the leaves moderately covered by stellate trichomes. However, in this species, the arms of the trichomes on the leaves are well defined in mature leaves, the base of the leaves is strongly decurrent, the inflorescence is narrower, the hypanthium is densely covered with stellate trichomes, and the connectives of the anthers are usually ventrally biappendaged. Miconia atlantica has been misunderstood as a "glabrescent form" of M. budlejoides (e.g., Goldenberg & Reginato, 2006, and on specimens from several herbaria) and was reported as Miconia sp.1 in the Flora of the state of São Paulo (Goldenberg, 2009). The specimens of M. atlantica collected in São Paulo have marsupiform domatia (i.e., with membranes joining the bases of the main veins) on the abaxial surface of the leaves. None of the other above-mentioned species has such a membrane. The occurrence of domatia is usually associated with a mutualistic relationship between plants and arthropods. It has been suggested that the anatomy and morphology of the domatia is governed by environment factors but it is expected that their occurrence is genetically determined (Carvalho et al., 2012). There is quite a number of Miconia species with these mite