74 research outputs found
FIGURE 1. A in Eugenia alletiana (Myrtaceae), a new critically endangered species endemic to the island of Mauritius
No full textFIGURE 1. A. Tree; B–C. Bark; D. Leaf, adaxial surface; E. Leaf, abaxial leaf; F. Foliage with flower buds; G. Flower bud (A–C Le Pouce, others Brise Fer).Published as part of Baider, Cláudia & Vincent Florens, F. B., 2013, Eugenia alletiana (Myrtaceae), a new critically endangered species endemic to the island of Mauritius, pp. 1-12 in Phytotaxa 94 (1) on page 4, DOI: 10.11646/phytotaxa.94.1.1, http://zenodo.org/record/507220
Jumellea exilis Schlechter 1915
No full textJ. exilis (Cordem.) Schltr. (Fig. 1) Distribution:— Mauritius, Réunion and Madagascar Specimens examined: — MAURITIUS. Mare Longue–Macabé Road, 11 October 1962, Vaughan s.n. (MAU 0002109) (fr.); Macabé, 1 November 1962, Vaughan s.n., (MAU); Macabé, 12 October 1968, Edgerley s.n., (MAU); Tamarind Falls, 21 December 1968, Wiehe s.n. (MAU); Brise Fer, 2 August 1982, Lamusse s.n. (MAU); Rivière Dimanche–Simonet, 21 March 1984, Lamusse s.n. (MAU 0008290) (fl., fr.); Mondrain, 14 June 1996, D. Florens & D’Argent s.n. (MAU); Rambouillet – La Nicolière, 400 m, 6 August 2009, 20 º 09’ 53” S, 57 º 36’ 53” E, Pynee et al. s.n. (MAU 0004857) (fr.); Brise Fer, 595 m, 10 June 2009, 20 º 22’ 35’’ S, 57 º 26’ 34” E, V. Florens & Baider CB 2244 (MAU 0008274) (fl.); Le Pouce, ca. 800 m, 20 º 11’ 52” S, 57 º 31’ 43” E, 24 September 2011, V. Florens & Baider CB 2523 (MAU 0009140) (fl.); s. loc., 1847-52, Boivin 1055 (MAU). Habitat: —In Mauritius: epiphyte in transitional and evergreen forest (400–650 m elev.) on canopy trees of 10–18 m high and lithophytic on micro ledge on steep cliffs at about 800 m elevation or on large boulders. Conservation status: —The species is assessed in Mauritius as Critically Threatened CR B1ab(i, ii, iii, iv) + B2ab(i, ii, iii, iv); C2a(i); D as per IUCN red list criteria (IUCN 2001). Phenology: —In Mauritius: flowering in June, September, October, November. Fruiting: October to December. Notes: — Jumellea exilis has a ramose, creeping stem with non-angled leaves, and oblong labellum. On the other hand, J. recta with which it has previously been confused on Mauritius, has a non-ramose erect stem with leaves angled above the articulation with the sheath, and a rhombic labellum.Published as part of Baider, Claudia, Vincent Florens, F. B., Rakotoarivelo, Fanny, Bosser, Jean & Pailler, Thierry, 2012, Two new records of Jumellea (Orchidaceae) for Mauritius (Mascarene Islands) and their conservation status, pp. 21-28 in Phytotaxa 52 (1) on page 24, DOI: 10.11646/phytotaxa.52.1.3, http://zenodo.org/record/506084
Syzygium pyneei (Myrtaceae), a new critically endangered endemic species from Mauritius
No full textA new species of Syzygium Gaertn. (Myrtaceae), S. pyneei Byng, V. Florens & Baider, is described from Mondrain Reserve on the island of Mauritius. This species is endemic to the island and differs from any other species by its combination of cauliflory, relatively large flowers, light green to cream hypanthium, light pink stamens, short thick petioles, coriaceous leaves and round, cuneate or sub-cordate to cordate leaf bases. Syzygium pyneei Byng, V. Florens & Baider is known from only two individuals from the type locality and merits the conservation status of Critically Endangered (CR C2a(i,ii); D)
Mid-Holocene (4200 kyr BP) mass mortalities in Mauritius (Mascarenes): Insular vertebrates resilient to climatic extremes but vulnerable to human impact (vol 21, pg 1179, 2011)
No full textKenneth F. Rijsdijk, Jens Zinke, Perry G.B. de Louw, Julian P. Hume, Hans (J.) van der Plicht, Henry Hooghiemstra, Hanneke J.M. Meijer, Hubert B. Vonhof, Nick Porch, F.B. Vincent Florens, Claudia Baider, Bas van Geel, Joost Brinkkemper, Tamara Vernimmen and Anwar Janoo (2011) Mid-Holocene (4200 kyr BP) mass mortalities in Mauritius (Mascarenes): Insular vertebrates resilient to climatic extremes but vulnerable to human impact. The Holocene. DOI: 10.1177/0959683611405236
Jumellea rossii Senghas 1967
No full textJ. rossii Senghas Distribution: — Mauritius and Réunion Specimens examined: — MAURITIUS. Macabé, 27 July 1967, Vaughan, s.n. (MAU 0002113) (fr.). Habitat: — In Mauritius: epiphyte of evergreen forest with canopy reaching 15-18 m high. Conservation status:— The species is assessed in Mauritius as Extinct (EX) as per IUCN red list criteria (IUCN 2001), as it was collected only once in 1967 and there are no known individuals alive today on the island despite the many botanical surveys that have been carried out in its known locality over the last 44 years. Phenology:— Flowering in Mauritius: July (plant in cultivation). Notes: — This species has a spur of the same length as the labellum while in J. cf. fragrans the spur is twice the length of the labellum.Published as part of Baider, Claudia, Vincent Florens, F. B., Rakotoarivelo, Fanny, Bosser, Jean & Pailler, Thierry, 2012, Two new records of Jumellea (Orchidaceae) for Mauritius (Mascarene Islands) and their conservation status, pp. 21-28 in Phytotaxa 52 (1) on page 25, DOI: 10.11646/phytotaxa.52.1.3, http://zenodo.org/record/506084
Corrigendum
No full text Kenneth F. Rijsdijk, Jens Zinke, Perry G.B. de Louw, Julian P. Hume, Hans (J.) van der Plicht, Henry Hooghiemstra, Hanneke J.M. Meijer, Hubert B. Vonhof, Nick Porch, F.B. Vincent Florens, Claudia Baider, Bas van Geel, Joost Brinkkemper, Tamara Vernimmen and Anwar Janoo (2011) Mid-Holocene (4200 kyr BP) mass mortalities in Mauritius (Mascarenes): Insular vertebrates resilient to climatic extremes but vulnerable to human impact. The Holocene. DOI: 10.1177/0959683611405236. </jats:p
Alexander invariants of ribbon tangles and planar algebras
No full textACLInternational audienceRibbon tangles are proper embeddings of tori and cylinders in the 4-ball B-4, "bounding" 3-manifolds with only ribbon disks as singularities. We construct an Alexander invariant A of ribbon tangles equipped with a representation of the fundamental group of their exterior in a free abelian group G. This invariant induces a functor in a certain category Rib(G) of tangles, which restricts to the exterior powers of Burau-Gassner representation for ribbon braids, that are analogous to usual braids in this context. We define a circuit algebra Cob(G) over the operad of smooth cobordisms, inspired by diagrammatic planar algebras introduced by Jones [Jon99], and prove that the invariant A commutes with the compositions in this algebra. On the other hand, ribbon tangles admit diagrammatic representations, through welded diagrams. We give a simple combinatorial description of A and of the algebra Cob(G), and observe that our construction is a topological incarnation of the Alexander invariant of Archibald [Arc10]. When restricted to diagrams without virtual crossings, A provides a purely local description of the usual Alexander poynomial of links, and extends the construction by Bigelow, Cattabriga and the second author [BCF15]
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