Sphagnum angustifolium
Sphagnum cyclophyllum
fine bogmoss, poor-fen peat-moss, sphagnum
sphagnum
leaves equilateral to isosceles-triangular, small, less than 0.8 mm, mostly appressed to stem, apex acute to obtuse, hyaline cells efibrillose and nonseptate.
leaves broadly ovate, 3.5–4 mm, apex rounded and indistinctly toothed;
hyaline cells on convex surface with 10–20 small (2.5–7.5 µm) round pores approximately 1/6 the diameter of the hyaline cells along the commissures, cells on concave surface uniporose in distal end or aporose, sometimes one or a few pores are scattered over the surface of the cells.
straight to slightly curved, usually 5-ranked;
leaves not much longer at distal end than proximal end.
few, single and short or more commonly none.
narrowly ovate-lanceolate, 0.8–1 mm, straight, moderately undulate and recurved in larger and/or wetter grown forms, not undulate and slightly recurved in compact forms from drier sites;
margins entire;
hyaline cells on convex surface with 1(2–3) pore per cell at apical end of cell, on concave surface with round wall thinnings in cell ends and angles; chlorophyllous cells triangular in transverse section and just enclosed on concave surface.
if any, are usually slightly smaller, 2–3 mm, but otherwise identical to the stem leaves.
dioicous.
dioicous.
immersed in perichaetial leaves, pseudopodium extremely short, without pseudostomata.
21–25 µm; coarsely papillose on proximal and distal surfaces;
proximal laesura more than 0.5 spore radius.
25–40 µm; coarsely papillose on both surfaces;
proximal laesura more than 0.5 the length of the spore
fascicles with 2 spreading and 2–3 pendent branches.;
branch stems with cortex enlarged with conspicuous retort cells, often pinkish red at proximal end.
fascicles, if any, usually only 1 single branch.
Sphagnum angustifolium
Sphagnum cyclophyllum
The sporophytes of Sphagnum angustifolium are somewhat common. This species is distinguished from similar ones in sect. Cuspidata by the small, triangular, obtuse and appressed stem leaves. It also often has a pink stem, as opposed to the reddish branch bases seen in some other species of the section. Sphagnum balticum has stem leaves that are more lingulate-triangular as well as spreading from the stem. Sphagnum angustifolium belongs to a subgroup within sect. Cuspidata usually referred to as S. recurvum, in the broad sense, a group of mostly carpet-forming species that differ from other members of the section in having pairs of pendent branch buds visible between the capitulum rays. The group also includes S. brevifolium, S. fallax, S. flexuosum, S. pacificum, S. recurvum, S. rubroflexuosum, and S. splendens.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Sporophytes are quite rare in Sphagnum cyclophyllum, which grows associated with S. pylaesii, S. perichaetiale, S. portoricense, and S. lescurii. Sphagnum pylaesii is the only other North American Sphagnum that regularly grows unbranched. The latter species not only lacks the typical sect. Subsecunda branch leaf porosity of S. cyclophyllum but is also much more slender. Sphagnum pylaesii is also much more likely to occur submersed, where it occurs in branched forms, something S. cyclophyllum rarely does. See also discussion under 57. S. microcarpum and 61. S. platyphyllum.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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