Selaginella scopulorum

Maxon

Amer. Fern J. 11: 36. 1921.

IllustratedEndemic
Synonyms: Selaginella densa var. scopulorum (Maxon) R. M. Tryon Selaginella engelmannii var. scopulorum (Maxon) C. F. Reed
Treatment appears in FNA Volume 2.

Plants terrestrial or on rock, forming cushionlike or rather loose mats. Stems decumbent or creeping, not readily fragmenting, irregularly forked, without budlike arrested branches, tips straight; main-stem upperside and underside structurally slightly different, conspicuously or inconspicuously indeterminate, lateral branches radially symmetric, conspicuously determinate, strongly ascending, 1–2-forked. Rhizophores borne on upperside of stems, throughout stem length, 0.25–0.45 mm diam. Leaves monomorphic, in poorly defined pseudowhorls of 4 or 6, tightly appressed, ascending, green, linear-lanceolate to linear, in lateral ranks sometimes falcate, 2.5–4 (–4.3) X 0.5–0.75 mm (upperside leaves smaller than underside, smaller also on ascending buds); abaxial ridges present; base (on main-stem) decurrent, oblique, and glabrous on underside leaves, slightly decurrent to adnate, oblique, and glabrous or rarely puberulent on upperside leaves; margins usually short-ciliate, cilia transparent, spreading or ascending at base, denticulate and ascending on distal 2/3, 0.02–0.07 (–0.15) mm; apex plane or sometimes slightly keeled, obtuse to attenuate, abruptly bristled; bristle whitish, transparent to opaque, with few teeth or smooth, 0.5–1.1 mm. Strobili solitary, (0.5–) 1–3 (–4.5) cm; sporophylls ovatelanceolate, lanceolate, or seldom ovate, usually tapering toward apex, abaxial ridges well defined, base glabrous, margins proximally short-ciliate to denticulate, lacking cilia apically, apex usually attenuate or slightly keeled, short-bristled.


Habitat: Rocky alpine tundra, subalpine meadows, dry cliffs, rocky slopes, rock crevices, granitic outcrops and ledges, sandstone outcrops, in soil pockets among rocks, or sandy or granitic soil
Elevation: 700–3700 m

Distribution

V2 545-distribution-map.gif

Alta., B.C., Ariz., Calif., Colo., Idaho, Mont., N.Mex., Oreg., Utah, Wash., Wyo.

Discussion

Selaginella scopulorum is a member of the S. densa

complex, in which there is a clear need for more systematic studies. Some specimens of S. scopulorum from Montana, Wyoming, and Colorado have more conspicuous whitish bristles than those elsewhere and are difficult to distinguish from S. densa.

Selected References

None.

Lower Taxa

None.

... more about "Selaginella scopulorum"
Short-bristled (?) +, Keeled (?) +, Attenuate (?) +, Bristled (?) +  and Obtuse (?) +
Iván A. Valdespino +
glabrous +  and puberulent +
decurrent +
transparent;opaque +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
0.007 cm0.07 mm <br />7.0e-5 m <br /> (0.015 cm0.15 mm <br />1.5e-4 m <br />) +
transparent +
denticulate +
0.002 cm0.02 mm <br />2.0e-5 m <br /> (0.007 cm0.07 mm <br />7.0e-5 m <br />) +
Alta. +, B.C. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, N.Mex. +, Oreg. +, Utah +, Wash. +  and Wyo. +
700–3700 m +
Rocky alpine tundra, subalpine meadows, dry cliffs, rocky slopes, rock crevices, granitic outcrops and ledges, sandstone outcrops, in soil pockets among rocks, or sandy or granitic soil +
monomorphic +
0.4 cm4 mm <br />0.004 m <br /> (0.43 cm4.3 mm <br />0.0043 m <br />) +
2.5mm;4mm +
fertile +  and vegetative +
linear-lanceolate;linear +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.075 cm0.75 mm <br />7.5e-4 m <br />) +
ciliate +  and serrate +
proximally short-ciliate;denticulate +
cushionlike +
globose +, ovoid +  and tetrahedral +
tetrahedral +
Amer. Fern J. +
alternating +
0.025 cm0.25 mm <br />2.5e-4 m <br /> (0.045 cm0.45 mm <br />4.5e-4 m <br />) +
Illustrated +  and Endemic +
adjacently +  and monomorphic +
fertile +  and vegetative +
branched +, not +  and articulate +
dimorphic +, climbing +  and cespitose +
3 cm30 mm <br />0.03 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
quadrangular +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Selaginella densa var. scopulorum +  and Selaginella engelmannii var. scopulorum +
Selaginella scopulorum +
Selaginella subg. Tetragonostachys +
species +
straight +
branched +  and not articulate +
erect +  and creeping +
branched +  and not articulate +
erect +  and creeping +
differentiated +
perennial +  and annual +
on rock +  and terrestrial +
epiphytic +  and hemiepiphytic +
12 +, 11 +, 10 +, 9 +, 8 +  and 7 +