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FNA | Family List | FNA Vol. 27 | Sphagnaceae | Sphagnum

16. Sphagnum mirum Flatberg & Thingsgaard, Bryologist. 106: 501. 2003.

Plants fairly slender to moderate-sized, green; forming low dense hummocks. Stems yellowish green; 3 layers of superficial cortical cells. Stem leaves generally longer than branch leaves, 1.1-1.7 mm, lingulate to lingulate-spathulate, hyaline cells mostly non-septate. Branches terete. Branch fascicles of 2 spreading and 1-2 hanging branches. Branch stems with 1-2 layers of cortical cells. Branch leaves 1-1.4 mm, broadly ovate, with a narrow involute tip; hyaline cells only slightly bulging on either surface, in proximal half of leaf aporose on convex surface and with large faint pores on concave surface; internal commissural walls distinctly papillose; chlorophyllous cells elliptical to elliptical-triangular in transverse section, enclosed on both surfaces with the widest part in the leaf middle. Sexual condition dioicous. Spores ca. 31 ┬Ám, ornamented by small somewhat amalgamated granulae.

Sporophytes abundant, capsules mature August. Ecology poorly known but probably quite minerotrophic; low elevations; Alaska.

Sphagnum mirum has only been recently discovered and so far is known only from its type locality, where it was growing in a fen mixed with S. teres.


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