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Dicranum undulatum
The short, irregular leaf cells; strongly differentiated alar cells; and undulate, rather blunt leaves characterize this species. Two other species with undulate leaves are Dicranum polysetum that has strongly nodose, elongate upper leaf cells and D. acutifolium with slender, acute leaf apices. Aulacomnium palustre has leaf cells each with one well-developed, blunt, conical papilla.
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Clockwise, from top left: plant in field, alar cells, leaf apex, cell detail, and whole leaf |
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| Habit | Erect, unbranched plants, often with single sporophytes |
| Stems | colorless, overed with orange-brown tomentum of rhizoids |
| Leaves | lanceolate, obtuse to bluntly acute, with strong single costa, entire except just below apex where several course serrations are present, ireggularly undulate above, loosely erect wet or dry |
| Leaf Cells | irregularly isodiametric to oblong or quadrate, somewhat longer below, smooth or with an inconspicuous, low, single, papilla per cell |
| Alar Cells | Consists of well differentiated groups of reddish, thick-walled, quadrate, enlarged cells |
| Habitat | Occurring as small clumps interspersed on hummocks in both bogs and fens, more common in bogs. One of the most commonly collected plants from boreal peatlands, but less common in oceanic areas and northward |
Common Associates |
Spagnum fuscum, Tomethypnum nitens, Aulacomnium palustre, and Pleurozium schreberi |
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