Riccardia vohimanensis Reeb & Gradst., 2020
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publication ID |
https://doi.org/ 10.5252/cryptogamie-bryologie2020v41a2 |
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DOI |
https://doi.org/10.5281/zenodo.12215481 |
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persistent identifier |
https://treatment.plazi.org/id/03EF87AA-6534-FFDD-C9BE-E2FFFC04F987 |
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treatment provided by |
Felipe |
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scientific name |
Riccardia vohimanensis Reeb & Gradst. |
| status |
sp. nov. |
Riccardia vohimanensis Reeb & Gradst. View in CoL sp. nov.
( Fig. 4 View FIG U-X)
DIAGNOSIS. — Monoicous. Thallus rigid, unwinged, with short branches. Axis plano-convex to biconvex, 8-12 cells thick, ventral side with mycorrhiza-like fungi. Immature calyptra strawberry-like.
TYPE. — Madagascar. Vohimana Reserve, 18°55’43.6S 48°29’53.6”E 849 m, 15.IV.2010, Reeb, Andriamantena & Bidault CRAE 96 * (holo-, PC [ PC 0771053]).
FURTHER SPECIMENS EXAMINED. — Madagascar. Alaotra-Mangoro, Zahamena Reserve, 17°38’22”S, 48°38’47”E, 1247 m, 27.XII.2013, Reeb CR 13 Z 23* ( PC 0763868); Maromizaha Reserve, 18°58’33.9”S 48°27’54.3”E, 1021 m, 05.VII.2012, Reeb MTM1278* ( PC 0763879), 18°58’45”S, 48°27’51.8”E, 1011 m, 06.VII.2012, Reeb MTM1290* ( PC 0763878); Haute Matsiatra, Andringitra Nat. Park, 22°08’4061” S, 46°53’47.4”E, 1590 m, 21. V.2016, Reeb CR 16 M 52 ( PC).
Malawi. Mulanje Mt., 15°53’32.1”S, 35°29’24”E, 2180 m, 22. VI.1991, O’Shea M 7327A-2* ( E 00430480).
Mauritius. Macabé, 550 m, 03.X.1962, Een M 028* (S-B7097).
DISTRIBUTION. — Malawi, Madagascar, Mauritius.
HABITAT. — On dead logs (bare, smooth and very hard wood) and buttresses, rarely on humid rock, from 550 m to 2200 m.
DESCRIPTION
Monoicous (autoicous or paroicous).
Thallus
Leathery and rigid, green to blackish green when fresh and forming rosettes on bare substrates, dull brown to black in herbarium, closely attached to the substrate, to 22 mm long, 1-2-pinnate, not palmate, branches alternate, not flagelliform, stolons lacking.
Main axis
Well-defined, 700-1000(-1200) µm wide, in cross section plano-convex to concave-convex, with mycorrhizal fungi in the ventral part, 8-12 cells thick, margins obtuse, not winged, epidermis cells 2-4× smaller than inner cells.
Ultimate branches
Oblong and stocky, to 2 mm long and 1 mm wide, in cross section biconvex to plano-convex, 7-9 cells thick, margins acute, not winged, branch apex rounded and often widened, emarginate to weakly dissected, without overlapping edges.
Mucilage papillae
Apical and lateral.
Oil bodies
Not seen.
Sexual branches
Numerous all along axis, often close to each other.
Male branches
Mainly grouped, sessile, 300-400 µm long, not winged, with 4-8 antheridial pairs.
Female branches
Grouped, laterally inserted, 300-500 µm long, base often elongate, female branch bordered by scales or long hair-like, straight cilia, the cilia longer than the width of the axis, archegonia in 4-6 pairs.
Calyptra
Less than 1 mm long, strawberry-like when immature, densely covered by rounded, thick-walled cells.
Gemmae
Sometimes present.
| PC |
Museum National d'Histoire Naturelle, Paris (MNHN) - Non-vascular Plants and Fungi |
| CR |
Museo Nacional de Costa Rica |
| Z |
Universität Zürich |
| S |
Department of Botany, Swedish Museum of Natural History |
| V |
Royal British Columbia Museum - Herbarium |
| M |
Botanische Staatssammlung München |
| VI |
Mykotektet, National Veterinary Institute |
| E |
Royal Botanic Garden Edinburgh |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.