Cyathea tsilotsilensis Tardieu

Janssen, Thomas & Rakotondrainibe, France, 2008, A revision of the indusiate scaly tree ferns (Cyatheaceae, Cyathea subgen. Alsophila sect. Alsophila) in Madagascar, the Comoros and the Seychelles, Adansonia (3) 30 (2), pp. 221-376: 242-243

publication ID

http://doi.org/10.5281/zenodo.5190422

persistent identifier

http://treatment.plazi.org/id/03D3163A-FF91-FFA5-3D06-499616AE69F0

treatment provided by

Carolina

scientific name

Cyathea tsilotsilensis Tardieu
status

 

3. Cyathea tsilotsilensis Tardieu   ( Figs 4F, G View FIG ; 46J View FIG )

Bulletin de la Société botanique de France 88: 682 (1941); Tardieu in Humbert, Flore de Madagascar et des Comores, IVe famille, Cyathéacées   : 6, fig. 2 (1-3) (1951). — Alsophila tsilotsilensis (Tardieu) R.M.Tryon, Contributions   from the Gray Herbarium 200: 31 (1970). — Type: montagnes entre l’Andohahela et l’Elakelaka: col de Tsilotsilo (à 6 km NE de l’Elakelaka), 24°50’S, 46°45’30’’E, 1300 m, II.1934, Humbert 14115 (holo-, P! [P00389552]; iso-, P! [2 sheets]).

ADDITIONAL MATERIAL EXAMINED. — Madagascar. Toliara, Tolanaro, RNI d’Andohahela , NW d’Eminiminy, 24°37’55’’S, 46°45’29’’E, 520 m, 22.X.1995, Rakotondrainibe 2890 (P). — Idem, 24°38’S, 46°40’E, 500- 1000 m, II.1993, van der Werff et al. 12902 (BR, G, MO, P), 12905 (G, MO, P) GoogleMaps   .

FIELD OBSERVATIONS. — Trunk: HT up to 6 m. Lamina: LL 200 cm.

DESCRIPTION

Petiole: about 30-83 cm long, 1-1.8 cm in diameter when dry; completely stramineous to light brown when dry, sometimes tinged with red, with a thin and caducous tomentum of light brown squamules.

Lamina: bipinnate, subcoriaceous, light green below, shiny green to dark green above when dry; rachis of the same colour as the petiole.

Largest pinnae: 40-63 cm long, distant by 9-11 cm, adjacent pinnae contiguous to overlapping, their apex more or less truncate and the apical pinnule conform, i.e. resembling the lateral pinnules; costae and costulae of the same colour as the petiole.

Largest pinnules: 4-6(-8) × 1-1.5 cm, spaced by less than their width, petiolulate, the petiolule 0.1-0.2 cm long, articulated and the pinnules easily shed upon drying, pinnules lanceolate-oblong, straight, their margin subentire, serrate in the acute to caudate apex, their base truncate, rounded or cordate; veins once, rarely twice furcate.

Scales and hairs: scales present from the petiole base upwards to 15-50 cm on the petiole, usually not reaching the first pinna pair, dense and overlapping, persistent, narrowly triangular, (1.5-)2-2.5 × 0.1(-0.2) cm, straight to slightly falciform, with a shiny light to dark brown centre and a distinct stramineous border of elongate cells, with a light brown erose margin of irregularly shaped cells, appressed, adaxial scales not appressed, antrorse, not indurated; scattered dark brown acaroid squamules on the abaxial face of the costulae and veins; adaxial face of the costae moderately densely tomentose with more or less contorted and antrorse, dark brown multicellular hairs; leaf otherwise glabrous.

Sori: contiguous to spaced by about their width, spaced from the costula by at least their width, about 0.1 cm in diameter, covering the entire pinnule or its lower half, but usually not the apex and the base; indusia most likely globular, light brown, very thin and membranous, at maturity dehiscing irregularly, only a rudiment persistent as a collar around the base of the receptacle; receptacle capitate to disciform, usually longer than the rim of mature indusia, with inconspicuous filiform paraphyses much shorter than the sporangia.

DISTRIBUTION

Southern Madagascar: Andohahela massif; endemic.

ECOLOGY

500-1300 m. Dense evergreen rainforests.

REMARKS

Cyathea tsilotsilensis   has more delicate leaves than its close relatives of group IIa, with smaller pinnules that have a truncate to rounded, rarely cordate base. The petiole scales are much denser than in C. perrieriana   and differ from those of C. marattioides   in having a distinct brown centre and stramineous border even in old leaves. Cyathaea tsilotsilensis   furthermore distinct by its petiole and leaf axes being of much lighter colour in the dry and consequently most likely also in the fresh state.

MO

Missouri Botanical Garden

Kingdom

Plantae

Phylum

Tracheophyta

Class

Polypodiopsida

Order

Cyatheales

Family

Cyatheaceae

Genus

Cyathea

Loc

Cyathea tsilotsilensis Tardieu

Janssen, Thomas & Rakotondrainibe, France 2008
2008
Loc

Alsophila tsilotsilensis (Tardieu) R.M.Tryon, Contributions

R. M. Tryon 1970: 31
1970