Pflanzenwissen · Art
DESCRIPTION Saxicolous plant of (17 -) 26 - 34 (- 39) cm.
Für diese Art liegt uns noch kein frei lizenziertes Foto vor.
DESCRIPTION Saxicolous plant of (17 -) 26 - 34 (- 39) cm. Pseudobulbs bifoliate, ovoid, tubular to conical, (23 -) 32 - 40 (- 74) × (4 -) 6 - 8 (- 13) mm, with 3 internodes, bright orange on ageing organs and on dry specimens, covered with 3 deciduous, large papyraceous, translucent and 7 - veined cataphylls applied to the pseudobulb. Leaves: gutter-shaped pseudopetiole canaliculate, 3 mm long, blade (19 -) 26 - 41 (- 58) × (6 -) 8 - 10 (- 12) mm, obovate to elliptic oblong, apex obtuse, asymetrical. Inflorescence subterminal, (70 -) 260 - 320 (- 380) × 1 mm, erect, slender and multiflorous, flower non resupinate, sometimes with a ramification, (9 -) 10 - 13 (- 21) flowers. Flower: Peduncle (5 -) 6 - 8 (- 9) × 0.6 - 1 mm, white. Tepals greenish-yellow. Median sepal lanceolate, (4.9 -) 5.4 - 6.3 (- 6.8) × (1.4 -) 1.5 - 2.7 (- 5.1) mm. Lateral sepals triangular falciform, (5.1 -) 6 - 6.5 (- 8) × (1.6 -) 1.7 - 2 (- 2.4) mm. Petals spatulate, (4.7 -) 5.3 - 6.2 (- 6.5) × (1.4 -) 1.5 - 1.8 (- 1.9) mm, slightly deflected. Lip, 5.1 × 2.8 mm, 3 - lobed. Hypochile and mesochile thick with a gibbous callus, white, obscurely tricarinate, the keels extended by 3 flattened, slightly divergent extensions, pink, 1 mm long and 0.7 mm wide (median extension), 0.4 mm wide (lateral extensions). Lateral lobes oriented upward, 2.5 × 0.9 mm, light pink striped with dark pink, roughly trilobular, the proximal lobule, small, rounded, 0.44 - 0.47 wide, the median lobule, ovate, 1.4 × 0.8 mm, the distal lobule, triangular, 0.8 × 0.4 mm, ending in a white tip. Median lobe trilobulate, 2.4 × 2.9 mm, white, lateral lobules, triangular, non-deflected, 0.8 × 0.7 mm, greenish-white, median lobule rounded, 2.3 × 2 mm, white, obscurely carinate. Column white, except the edge of the stigma which is pinkish, 4.5 × 1.3 mm with a 2 mm long mentum, and 1.5 mm deep at the point of attachment to the ovary. Androecium: anther cap (connective appendage), white, 0.6 mm wide and 0.6 mm high, pollinia, 2, yellow, obovoid, 0.5 × 0.2 mm. Gynoecium: stigma rectangular, 0.9 mm wide and 0.6 mm high, ovary, 2 - 3 × 0.9 mm, reddish. Fruit obovoid to spherical, 13 - 15 (- 17) × (7 -) 8 - 10 mm, greenish with purple strips.
Pflege
Für diese Art liegen uns noch keine geprüften Pflegehinweise vor.
Frag die Community — kostenloses Konto →Weltkarte
Vorkommen (Status unklar)
Global, Neukaledonien
Marktplatz
Noch niemand hat diese Art im Angebot.
Steht sie bei dir zu eng? Ein Ableger findet hier schnell ein neues Zuhause.
Belege
Dendrobium petrophilum (Kraenzl.) Garay, Eria petrophila Kraenzl., Tetrodon petrophilus (Kraenzl.) M.A.Clem. & D.L.Jones
Nächster Schritt
Beschreib dein Problem in der Pflanzenhilfe. Mit Foto antwortet meist noch am selben Tag jemand, der dieselbe Pflanze zu Hause hat. Aus Rücksicht auf die Fragenden lesen die Anfragen nur angemeldete Mitglieder — mitmachen kostet nichts.
(Figs 1; 2 A-D; 3 A-E; 4)
PHENOLOGY. — From herbarium specimens, flowers have been recorded from April through November (except in August) and fruits have been recorded all the year. ECOLOGY. — The epithet is very well fitting the ecology of this species usually living on rocks (saxicolous) and especially the cracks of the rocks (chasmophyte), Fig. 2 C. However, Dendrobium petrophilum is also able to grow at the base of trees and shrubs (but not truly epiphytic, Fig. 2 D) where it can get some shelter from the harsh natural environmental conditions (extreme drought, strong prevailing wind, full sun, rocks with no or little soil) encountered in this type of “ acidic maquis ” (Fig. 2 A) which is very different from the typical New Caledonian “ ultramafic maquis ”. The bedrock is a siliceous schist and its derived soil (if any) is a kind of ferric acrisol (Latham 1975). Some other species like Codia microphylla Vieill. ex Guillaumin, Homalium buxifolium Däniker, Leichhardtia oubatchensis, Phyllanthus golonensis M. Schmid and Tristaniopsis ninndoensis J. W. Dawson are well adapted to this type of maquis.
CONSERVATION STATUS. — A first IUCN assessment was made on 29 January 2016 by the local Red List Authority (RLA Endemia) which proposed the species as Data Deficient (DD) because of too much taxonomic uncertainty. This assessment has been published in 2020 on the IUCN Red List Portal (Butin et al. 2020 a). Since, the species has been rediscovered in 2018 in the type locality (locus classicus) by two of the authors of this note, and in other places by other people, since then, we have been able to clarify its taxonomic status. A second IUCN assessment by the RLA Endemia took place on 20 November 2020 and proposed the species as EN B 1 ab (iii, v) + 2 ab (iii, v). We fully agree with this proposed status because of the very high fire threat. According to some observations (D. Fleurot pers. comm.), after a rapid fire event, the pseudobulbs are drying out and can be observed several years after the event (Fig. 2 D). In addition, the species is protected in the Province Nord (Northern province).