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

1h. Sphagnum sect. Polyclada (C. E. O. Jensen) Horrell, J. Bot. 38: 119. 1900.

Sphagnum [unranked] Polyclada C. E. O. Jensen in Botaniske Forening København, Festskrift, 82. 1890; Sphagnum [unranked] Pycnoclada (Russow) H. Klinggräff

Plants small to moderate-sized, with distinct capitulum; green, brown or variegated brown and red. Stems green to red-brown, superficial cortex of 2-4 layers of efibrillose, non-ornamented, enlarged, short-rectangular cells. Stem leaves smaller than branch leaves, triangular-lingulate, with rounded apex, border entire; hyaline cells efibrillose, non-ornamented, rhomboid, septate; resorbed on convex surface; concave surface intact except near apex. Branches dimorphic, spreading branches stiff; pendent branches slender and delicate. Branch fascicles with 3(-8) spreading and 3(-8) pendent branches. Branch stems with distinct solitary retort cells, necks not or slightly rostrate. Branch leaves ovate-lanceolate, apex involute, border entire; hyaline cells fibrillose and non-ornamented, convex surface with 4-6 small ringed ovate pores (approximately 1/4 the diameter of the cell), concave surface with 0-4 unringed pores per cell; chlorophyllous cells elliptic to truncate-elliptic in transverse section, qually exposed on both surfaces. Sexual condition monoicous or dioicous. Capsule with few pseudostomata. Spores 15-24 µm; finely papillose on both surfaces; proximal laesura less than 0.5 the length of the spore.

Species 1: North America, Eurasia.

Lower Taxon


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