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Published In: Journal of the Linnean Society, Botany 12: 50. 1869. (J. Linn. Soc., Bot.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

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Project data     (Last Modified On 2/16/2011)

Leptodontium luteum is a robust species with long, laxly ascending stems similar to those of L. longicaule. It differs from all Central American species of Leptodontium in having leaf margins dentate to near the leaf insertion. This feature of L. luteum can be difficult to see because the lower leaf margins are sometimes narrowly recurved then narrowly incurved at the edges more or less hiding the marginal teeth. Leptodontium luteum has simple, low leaf papillae that are densely crowded over and between the lumina. Although both the inner and outer basal leaf cells are very thick-walled, porose and pluripapillose, the inner basal cells are narrowly elongate, while the outer basal cells are short-rectangular to quadrate and often somewhat enlarged.

Illustrations: Zander (1972, Figs. 4, 15, 116–123); De Sloover (1987, Figs. 76–96); Zander (1993, Pl. 37 5–6); Churchill and Linares (1995, Fig. 155 i–l). Figure 45.
Habitat: On soil bank; 300–3300 m.
Distribution in Central America: COSTA RICA. Cartago: Dauphin 2056 (CR, MO); Heredia: Lemmon 97 (MO); San José: Crosby & Crosby 5721 (BM, CR, DUKE, F, FH, H, MICH, MO, NY, S, US).
World Range: Central America; Caribbean, Western and Northern South America; West Central and East Tropical Africa.


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8. Leptodontium luteum (Tayl.) Mitt., J. Linn. Soc., Bot. 12: 50. 1869.

Didymodon luteus Tayl., London J. Bot. 5: 48. 1846. Protologue: Ecuador. Common on Pichincha, near Quito, Prof. William Jameson.



Plants medium to large in loose tufts, yellow-green to green, to 15 cm high. Stems red, erect or laxly ascending, hyalodermis present, not or sparsely radiculose. Leaves moderately to well-spaced, erect and spirally twisted to contorted, at times undulate when dry, patulous, squarrose or squarrose-recurved when wet, ovate-lanceolate to lanceolate, 4–7 mm long, keeled above, weakly sheathing at base, decurrent; apices acute; margins usually recurved in lower 1/2–2/3, at times narrowly recurved then narrowly incurved at base, dentate to near insertion; costa percurrent to subpercurrent; upper leaf cells quadrate to subrectangular, firm-walled, evenly thickened, 5–15 x 5–12.5 μm, densely pluripapillose, papillae simple, low, crowded, 4–6 scattered over the over the lumina, inner basal cells narrowly elongate, pluripapillose, thick-walled, porose, not bulging, 42.5–92.5 x 10 μm, outer basal leaf cells rectangular to quadrate, pluripapillose, thick-walled, porose, 10–30 x 10 μm, alar cells not differentiated. Sporophytes not seen from Central America, description based on South American plants. Dioicous. Setae straight, 1–5 per perichaetium, 10–20 mm long, yellow, becoming red-brown with age. Capsules erect, cylindrical, 2–3 mm long, smooth when dry; exothecial cells long-rectangular, firm-walled; stomata at base of urn; opercula erect, conic-rostrate, 1 mm long; peristome teeth linear, divided to the base, red-brown, obliquely striate. Spores 10–17.5 μm, slightly papillose. Calyptrae cucullate, smooth, 4–5 mm long.



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