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Published In: Die Natürlichen Pflanzenfamilien 1(3): 634. 1904. (Nat. Pflanzenfam.) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 3/7/2011)
Acceptance : Accepted
Project data     (Last Modified On 3/7/2011)

At first glance Leiomela appears to be clearly distinct from Bartramia, but Bartramia is so variable that the genera are technically difficult to separate. For example, Leiomela has exceedingly long perigonial/perichaetial leaves and immersed capsules that are eperistomate or have rudimentary peristomes. In contrast, Bartramia usually has short perigonial/perichaetial leaves and long-exserted capsules with well-developed peristomes. There are, however, some species of Bartramia with Leiomela-like perigonial/perichaetial leaves, other species with immersed capsules, and some eperistomate species. Most Bartramia species differ from Leiomela in having leaves with multistratose upper leaf limbs, but again there are some Bartramia species with unistratose leaves. Although a stem hyalodermis is commonly encountered in Bartramia, some of its species are similar to Leiomela in lacking this feature. The two genera do appear to differ in spore ornamentation (reticulate in Leiomela, verrucate in Bartramia) and calyptra form. In Bartramia the calyptra is cucullate, while Leiomela has a short conic calyptra which perches precariously atop of the plano-convex to nearly flat operculum.

In Central America Leiomela is often collected on the trunks of tree ferns.


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Leiomela (Mitt.) Broth., Nat. Pflanzenfam. 1(3): 634. 1904.

Bartramia subsect. Leiomela Mitt., J. Linn. Soc., Bot. 12: 253. 1869.

Plants small to medium-sized, in loose or dense, glossy, glaucous-green, green, to yellow-green tufts. Stems simple or sparsely branched, hyalodermis absent. Leaves erect to erect- spreading, flexuose, linear to linear-lanceolate; apices subulate; margins spiculose, serrate, serrulate, or dentate; costae excurrent, percurrent or ending well below the apex; upper cells short-rectangular, papillose at upper ends, basal cells long-rectangular, smooth, alar cells not differentiated. Dioicous or synoicous. Perigonial and perichaetial leaves long-setaceous, to 15 mm long. Setae 1–2 mm long. Capsules immersed, erect, ovoid-oblong; exothecial cells lax; stomata somewhat immersed in capsule neck; opercula plano-convex to nearly flat; peristome none or double with exostome of 16 reduced exostome teeth and rudimentary endostome. Spores spherical, reticulate. Calyptrae conic.


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