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Published In: Species Muscorum Frondosorum 173–175, pl. 41, f. 6–9. 1801. (Sp. Musc. Frond.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 2/24/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/24/2011)

Meesia is a genus of 8 species (Crosby et al. 2000) generally associated with Sphagnum bogs or other very wet situations. Although it is usually found in northern boreal or south temperate regions, the genus also occurs at high elevations throughout the world. Meesia is characterized by its clavate to long‑pyriform, curved capsules with long, erect, conspicuous necks and an odd double peristome. Its exostome teeth are short (less than ½ the endostome length), lightly horizontally striate on the outer (dorsal) surface but more thickened on the inner (ventral) surface. The endostome has a short basal membrane, narrow segments with vertically elongate dorsal (outer) lamellae, and rudimentary cilia. The outer (dorsal) surface of the endostome segments are secondarily thickened in irregular, often discontinuous, yellow patches. The peristomial pattern on the Meesia endostome is somewhat similar to that seen in the Fontinalaceae.


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Meesia Hedw., Sp. Musc. Frond. 173. 1801. 

Medium-sized plants in dense, sordid‑green or yellowish tufts, brownish below, densely tomentose at stem base. Stems erect, forked. Leaves erect to wide-spreading, or squarrose, oblong‑lanceolate to oblong‑ovate; apices acute to rounded‑obtuse; costae single, subpercurrent to percurrent; upper cells short- to long‑rectangular, thin- or firm‑walled, smooth, basal cells lax and enlarged. Setae very long. Capsules erect‑pyriform, curved and asymmetric from an erect, elongate neck, smooth; opercula hemispherical to conic; exostome short, blunt or truncate; exostome teeth rudimentary, endostome 2–4 times as long as the exostome teeth, basal membrane low, segments narrow, keeled, slightly perforate, cilia 2–4, rudimentary or irregularly developed.

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