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

1b. Sphagnum sect. Rigida (Lindberg) Limpricht in G. L. Rabenhorst et al., Krypt.-Fl. ed. 2. 4(1): 116. 1885.

Sphagnum [unranked] Rigida Lindberg, Öfvers. Kongl. Vetensk.-Akad. Förh. 19: 135. 1862

Plants low-growing in loose mats to compact cushions, capitulum often indistinct or concealed by upwardly directed branches; pale green, straw-colored, brownish to reddish. Stems with superficial cortex of 1-3 layers of efibrillose, inflated, thin-walled, non-ornamented, and aporose cells. Stem leaves much smaller than branch leaves, triangular-lingulate, border entire and broadened at base; hyaline cells rhomboid, efibrillose, nonornamented, aporose, and usually nonseptate; hyaline cells not resorbed on either surface. Branches strongly dimorphic, spreading branches much stronger than pendent branches. Branch fascicles with 2-3 spreading branches and 2(-3) pendent branches. Branch stems green, green to brownish, surrounded by 1 layer of efibrillose, non-ornamented, inflated, thin-walled, uniporse cells with slight protruding necks. Branch leaves ovate to ovate-lanceolate, apex broadly truncate, smooth and toothed; margin denticulate; hyaline cells fibrillose, smooth or papillose, convex surface with ± 5 small to medium-sized free pores, sometimes numerous pseudopores, concave surface with large pores in cell angles; chlorophyllous cells elliptic to ovate-triangular in transverse section, completely enclosed or exposed on concave surface, end walls unthickened. Sexual condition monoicous or dioicous. Capsule 2 mm or less, with numerous pseudostomata. Spores mean diameter more than 30 µm, raised Y-mark sculpture on distal surface; proximal laesura more than 0.3 spore radius.

Species 5 (2 in the flora): worldwide except Antarctica.

1 Chlorophyllous cells of branch leaves elliptic in transverse section and completely enclosed on both surfaces, adjacent hyaline cell walls smooth; stem leaves lingulate to oblong-triangular.   13 Sphagnum compactum
+ Chlorophyllous cells of branch leaves elongate-triangular to ovate-triangular, enclosed on the adaxial surface and exposed on the convex surface, adjacent hyaline cell walls minutely papillose; stem leaves bluntly deltoid.   14 Sphagnum strictum

Lower Taxa


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