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Calliergon richardsonii
This is a species of the northern boreal forest. It is not completely clear how its habitat preferences differ from those of C. giganteum. These two species are similar in alar cell characters, but differ in strength of the costa and leaf shape. Both of these species differ from the eastern C. cordifolium, by the sharply differentiated alar cells, as compared to gradually differentiated ones of the latter species. Calliergon richardsonii has leaves that are shorter (1-2:1) and more ovate in shape then C. giganteum, wherein the stem leaves are oblong to oblong-ovate and about 2-3 times are long as wide. Also, C. giganteum is dioicous and seldom fruits, while C. richardsonii is autoicous and often has capsules.
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Habit |
Erect to ascending dark green plants with few to rather numerous side branches |
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Stems |
Flaccis and clear, without hyalodermis |
Leaves |
ovate to ovate oblong, obtuse, concave, with short, usually double costa ending 1/3 and 1/2 distance up leaf, margines erect, entire |
Leaf Cells |
elongate to long rhombic, wtih blunt ends |
Alar Cells |
hyaline, inflated, and forming an abruptly differentiated decurrent group |
Habitat |
emergent from pools in rich fens, especially in wooded fens and forested swamps |
Common Associates |
Species that also occur in wooded fen depressions are a vairety of species of Drepanocladus sensu lato |
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