Drepanolejeunea (Drepanolejeunea) tubana Pocs 2021, sp. nov.
Creators: name: Pócs, Tamás
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Plantae
Marchantiophyta
Jungermanniopsida
Porellales
Lejeuneaceae
Drepanolejeunea
Drepanolejeunea tubana

description: Drepanolejeunea (Drepanolejeunea) tubana Pócs, sp. nov.   (Fig. 3 A-D)  
 DIAGNOSIS. — The only species possessing similar leaf and underleaf shape, is Drepanolejeunea teysmannii (Gottsche) Steph., Hedwigia 35 (3): 84, 1896 (see Fig. 3E, F). But while Drepanolejeunea tubana sp. nov. has horizontally spreading leaves, the leaves of D. teysmannii both in wet and dry state are very obliquely inserted, forming an angle about 30° to the steem. Even more important, that while each cell of D. teysmannii on the outer leaf surface has an acute papilla, both leaf surfaces of D. tubana sp. nov. are completely smooth, lacking papillae or mamillae. From the somewhat similar Drepanolejeunea pentadactyla (Mont.), Sp. Hepat. 5: 537, 1913 it differs by the other leaf shape, more and scattered ocelli and by its forward directed underleaf lobes.   
 TYPE. — Madagascar, Fianarantsoa prov., Atsinanana reg; parc National de Ranomafana. Along the N side of main road at the head the big waterfalls on the Namorona river. Dripping granitic cliffs surrounded by montane rainforest, 1080-1150 m, 21°14.70-86’ S, 47°23.82’E. S. & T. Pócs, 04126/ QD, 29.VII.2004 (holo-, EGR).   
 ETYMOLOGY. — Drepanolejeunea tubana sp. nov. is named in honor of the late professor Zoltán Tuba, who organized, sponsored and participated our 2004 Madagascar collecting trip.   DESCRIPTION  
Pale green, 3-5 mm long, hardly branching shoots of 0.5- 0.6 mm width.   Stems   
Up to 60 µm diameter, with 7 cortical cell rows, including 2 ventral merophytes.   Rhizoids   
Scarcely develop.   Leaves   
Contiguous, horizontally spreading, ventral margin at an angle of 60-90° to the stem, acute triangular ovate, 250-320 µm long and 200-240 µm wide, antically with (3-)5-8, postically 1-2 large, triangular teeth of 1-3 cells high and wide at base, giving the leaf a lobulate character. Lobe apex acute and mostly incurved.   Lobe cells   
Subrectangular or elongate 5-6-gonal, 20-30 µm long and 15-20 µm wide, with thin walls. Small triangles and 1-2 intermediate thickenings are present on the longitudinal walls. Both dorsal and ventral surface smooth, without papillae or mamillae. Ocelli 1-5, scattered, same size and shape as average cells, in herbarium specimens with age usually disappear. Oil bodies also disappeared. Lobule near half of lobe length, ovate-lanceolate, inflated, with inflexed free margin. Therefore the lobule teeth hardly visible, both are acute, falcate and unicellular, 20-30 µm long, with only one cell between them.   Underleaves   
Of about 3× stem width, with 4 cells wide, cuneate base and with forward directed, at base 2 cells wide, 5-6 cells long, acute lobes with a U-shaped sinus.   Gametoecia and vegetative reproduction   
Unknown.
description: Published as part of Pócs, Tamás, 2021, Notes on the bryophytes of Madagascar 3. Six new Lejeuneaceae species, pp. 129-141 in Cryptogamie, Bryologie 20 (8) on page 133, DOI: 10.5252/cryptogamie-bryologie2021v42a8, http://zenodo.org/record/12215212